KR100700606B1 - Method for restricting ptt service - Google Patents

Abstract

The present invention relates to a PTT service limiting method for restricting a PTT service with reference to network information, wherein the PTT client inviting to the PTT session is turned on (Network Dependent Outgoing-Session-Barring Flag). ON) to limit the PTT clients that are invited, and PTT clients that are invited to the PTT session are invited by setting the Network Dependent Incoming-Session-Barring Flag to 'ON'. The PTT client may be limited, and the PTT client or the PTT client that is invited may be selectively limited using operating condition information for operating the flags.

PTT service, PTT client, PTT server, SIP / IP core

Description

Restriction on Pitiity Service {METHOD FOR RESTRICTING PTT SERVICE}

1 is a block diagram showing the configuration of a PTT system for explaining a PTT service restriction method according to the present invention;

2 is a signal flow diagram illustrating a process in which a PTT client A transmits a PUBLISH signal to a PTT server A;

3 is a signal flow diagram illustrating a process in which a PTT client B transmits a PUBLISH signal to a PTT server B;

4 is a signal flow diagram illustrating a process of transmitting a SUBSCRIBE signal and a NOTIFY signal between PTT clients or between PTT servers;

5 is a signal flow diagram illustrating a first embodiment of a PTT service restriction method according to the present invention;

6A is a signal flow diagram illustrating a second embodiment of a PTT service restriction method according to the present invention;

6b is a signal flow diagram illustrating a third embodiment of a PTT service restriction method according to the present invention;

7 is a signal flow diagram illustrating a fourth embodiment of a method for limiting PTT service according to the present invention;

8A is a signal flow diagram illustrating a fifth embodiment of a PTT service restriction method according to the present invention;

8b is a signal flow diagram illustrating a sixth embodiment of a method for limiting PTT service according to the present invention;

9 is a signal flow diagram illustrating a seventh embodiment of a PTT service restriction method according to the present invention;

10 is a signal flowchart illustrating an eighth embodiment of a method for limiting PTT service according to the present invention;

11 is a signal flowchart showing a ninth embodiment of the method for limiting PTT service according to the present invention;

12 is a signal flowchart illustrating a tenth embodiment of a method of limiting PTT service according to the present invention;

13A is a signal flowchart illustrating an eleventh embodiment of a PTT service restriction method according to the present invention;

13B is a signal flowchart illustrating a twelfth embodiment of the method for limiting PTT service according to the present invention;

14 is an implementation diagram in which an XML document expresses network information that PTT clients set to restrict a session;

15A and 15B are implementation diagrams expressing an outgoing session prohibition invalid flag transmitted through a user terminal in SDP (Session Description Protocol) format and an XML document.

The present invention relates to a PTT service, and more particularly, to a PTT service restriction method for restricting a PTT service with reference to network information when a client inviting to a PTT session and an invited client belong to different networks.

PTT (Push to Talk) is an immediate call service, such as a radio service, which allows communication without dialing or waiting for a phone connection. In addition, the PTT service is a half-duplex communication in which only one user is entitled to speak, and provides one-to-one or one-to-group calls according to a user's selection.

In the conventional PTT service, a process in which a specific client selects one or more clients to invite to a PTT session, a process in which a session is connected between a client inviting to the PTT session and the invited client, and voice data is transmitted and received between the session-configured clients. It consists of a process.

Clients invited to the PTT session set the Incoming-Session-Barring Flag to 'ON' to limit all PTT session invitations or for each client or through the Access Control List. PTT session invitations can be restricted for each group to which the client belongs. However, the PTT session limiting method has a problem of limiting the invitation indiscriminately without considering the information of the network where the client is invited or invited to the PTT session.

The conventional PTT service is not clearly defined for session establishment when the client inviting to the PTT session and the invited client exist in different networks. That is, if the client inviting to the PTT session and the invited client exist in different networks, and there is no function of limiting the invite process and the invited process, charging problems may occur due to different charging policies of each network.

Accordingly, an object of the present invention is to provide a PTT service restriction method for restricting the function of inviting based on network information when a client inviting a PTT session invites a client belonging to another network.

It is also an object of the present invention to provide a PTT service restriction method for limiting the invited function based on network information when a client invited to a PTT session is invited from a client belonging to another network.

As described above, the PTT service restriction method according to the present invention includes the steps of setting the network information for limiting session establishment by the first PTT client; Determining whether a network of a second PTT client to establish a session with the first PTT client satisfies the set network information; If satisfied, the first PTT client may be configured to stop the session establishment with the second PTT client.                         

As described above, in a PTT service system in which a first PTT client invites one or more PTT clients to establish a session, the PTT service limiting method according to the present invention may include a method for restricting a PTT client to a PTT client in a specific network. Setting network information to limit an invitation to the network; Among the invited PTT clients, it characterized in that it comprises a process of limiting the invitation to the PTT client that satisfies the set network information.

As described above, the PTT service in which the first PTT client of the first network sets network information to limit the invitation of the second PTT client that has moved from the first network to the second network by the first PTT client of the first network. In the PTT service restriction method according to the present invention, the first PTT server receiving a INVITE signal sent by the first PTT client via a first SIP / IP core; Transmitting, by the first PTT server, the network information on an INVITE signal to the first SIP / IP core; The first SIP / IP core checks the current network of the second PTT client, and notifies the first PTT client that the session establishment has been stopped using the NOK signal when the second PTT client belongs to the second network. The process consists of different features.

As described above, in the PTT service in which the first PTT client of the first network sets network information to limit the invitation of the second PTT client moving from the first network to the second network, PTT service restriction according to the present invention. The method includes: receiving, by a first PTT server, an INVITE signal sent by the first PTT client via a first SIP / IP core; Confirming, by the first PTT server, the current network of the second PTT client from the first SIP / IP core using a SUBSCRIBE signal and a NOTIFY signal; When the second PTT client belongs to the second network, the first PTT server may be configured to notify the first PTT client that the session establishment is suspended using the NOK signal.

As described above, in the PTT service in which the network information is set to limit the connection of the first PTT client of the first PTT network with one or more PTT clients of the second network moved to the third network, the PTT service according to the present invention. The limiting method may include: transmitting, by the first PTT client, an INVITE signal to the first PTT server; Transmitting, by the first PTT server, the network information on an INVITE signal to a second SIP / IP core of the second network; The second SIP / IP core may be configured to notify the first PTT client by using a NOK signal that the session setup with the PTT client moved to the third network is stopped.

As described above, in the PTT service in which the network information is set to limit the connection of the first PTT client of the first PTT network with one or more PTT clients of the second network moved to the third network, the PTT service according to the present invention. The method may include: receiving, by the first PTT server, an INVITE signal from the first PTT client; Identifying, by the first PTT server, the current network of the second PTT client from the second SIP / IP core of the second PTT network by using a SUBSCRIBE signal and a NOTIFY signal; The first PTT server may be configured to notify the first PTT client by using a NOK signal that the session setup with the PTT client moved to the third network is stopped.

As described above, in a PTT service in which network information is set such that a first PTT client of a first network restricts an invitation for a second PTT client not belonging to the first network, the PTT service limiting method according to the present invention includes: Receiving, by a first PTT server, an INVITE signal sent by the first PTT client; The first PTT server may be configured to check the URI of the second PTT client and notify the first PTT client that the session establishment is stopped using the NOK signal.

 According to the present invention, there is provided a method for limiting a PTT service, comprising: storing, by a first PTT client, network information in a first PTT server to restrict invitation to a specific network; When the inviting network satisfies the set network information, the first PTT server may be configured to limit the invitation.

As described above, in the PTT service in which the network information is set to limit the invitation of the first PTT client of the first network to the second network, the method for restricting PTT service according to the present invention may include: Receiving an INVITE signal from the mobile station; The first PTT server may be configured to compare the network information with the second network information, and notify the second network that the session setup is stopped using the NOK signal.

Hereinafter, an embodiment of a PTT service limiting method according to the present invention will be described with reference to the accompanying drawings.

In the present invention, the PTT client inviting to the PTT session may limit the PTT client invited by setting the network-dependent outgoing-session-barring flag to 'ON'.

In addition, in the present invention, the PTT client invited to the PTT session may limit the PTT client inviting by setting the network-based incoming session prohibition flag (On).

In addition, in the present invention, the PTT client may be a PTT client that invites a network-based origination session prohibition flag, a network-based incoming session prohibition flag, and condition information on which the flag operates by 'on / off' using any signaling protocol or You can optionally limit the PTT clients that are invited. In this case, the condition information is information specifying a specific network or information on whether a specific network to be restricted is a foreign network or a remote network.

1 is a block diagram showing the configuration of a PTT system for explaining a PTT service restriction method according to the present invention, the network 100 of PTT Client A and the network 200 of PTT Client B is different from each other and the configuration of the network Is assumed to be the same.

The network (100, 200) is a PTT client (110, 210) providing a user interface, PTT server (120, 220) for processing PTT signal and voice traffic, and the status information of the PTT client (110, 210) It is composed of access servers (Presence Server) (130, 230) for verifying and forwarding to other networks, and SIP / IP core (140, 240) for routing Session Initiation Protocol (SIP) messages. In this case, the SIP / IP cores 140 and 240 correspond to IMS (IP Multimedia Subsystem) in 3GPP and MMD in 3GPP2.

2 to 4 are signal flow diagrams showing functions basically required for the PTT service limiting method according to the present invention. Referring to the drawings, the functions are as follows.

FIG. 2 is a signal flow diagram illustrating a method for setting a network-based origination session prohibition flag and condition information under which the flag operates to restrict PTT client A from inviting PTT client B in network B. Referring to FIG.

The PTT client A transmits the network-based origination session prohibition flag value and condition information on which the corresponding flag operates to the SIP / IP core A using a PUBLISH signal of SIP (S21), and the SIP / IP core. A transmits the delivered PUBLISH signal to the PTT server A (S23).

The PTT server A stores a network-based origination session prohibition flag value transmitted through the PUBLISH signal and condition information on which the flag operates. In this case, PUT operation of Extensible Markup Language (XML) Configuration Access Protocol (XML) as well as the PUBLISH signal of the SIP may be used.

3 is a signal flow diagram illustrating a method in which a PTT client B sets a network-based incoming session prohibition flag for restricting an invitation from a PTT client A in network A and the condition information under which the flag operates.

The PTT client B transmits the network-based incoming session prohibition flag value and condition information on which the corresponding flag operates to the SIP / IP core B by using a PUBLISH signal of SIP (S31), and the SIP / IP core. B transmits the delivered PUBLISH signal to the PTT server B (S33).

The PTT server B stores the network-based incoming session prohibition flag value and condition information under which the flag operates. In this case, the PUT operation of Extensible Markup Language Configuration Access Protocol (XCAP) may be used as well as the PUBLISH signal of the SIP.

4 is a flowchart illustrating a process of asking and answering information desired between each other between PTT clients, SIP / IP cores, or between PTT servers, and requests information to be known by using a SUBSCRIBE signal (S41). The PTT client or the SIP / IP core or the PTT server that receives the SUBSCRIBE signal informs the requested information through a NOTIFY signal (S43).

That is, the PTT client A or the invited PTT client B inviting to the PTT session can receive the network-based outgoing session prohibition flag value and operation condition information or the network-based incoming session prohibition flag value and operation condition information through PUBLISH signal. May be stored in advance in the PTT server A or PTT server B of the network, and the information requested between the PTT clients or between the SIP / IP or the PTT server may be transmitted through a SUBSCRIBE signal and a NOTIFY signal. Can transmit

5 to 10 are signal flow diagrams illustrating embodiments of a PTT service restriction method according to the present invention. The PTT service restriction method will be described in detail with reference to the accompanying drawings.

5, 6A, and 6B illustrate a method of restricting PTT service when an inviting PTT client A and an inviting PTT client B are clients of the same operator in the same country and the PTT client B moves to a network of another country operator. The signal flow diagram shown. In this case, it is assumed that the PTT client A has previously set a network-based outgoing session prohibition flag value and operation condition information to the PTT server A in order to restrict an invitation for the PTT client in a specific network B (another country network).

FIG. 5 is a case of limiting an invitation in a SIP / IP core. When the PTT client A invites the PTT client B using an INVITE signal (S51), the SIP / IP core receives an INVITE signal. Routing to the PTT server A (S53).

If the network-based originating session prohibition flag value preset by the PTT client A is 'on', the PTT server A adds the flag value and condition information on which the flag operates to the invitation signal to the SIP. / IP core A (S55). That is, 'Network Dependent Outgoing-Session- Barring Flag = ON and Operating Condition = Other Country Network' are added to the INVITE signal.

The PTT client B, initially a subscriber of network A, moves to network B (another country network) and then reports the information about the current network to the SIP / IP core A using a REGISTER signal. / IP Core A knows that the PTT Client B has now moved to Network B. In this case, the SIP / IP Core A should include a database that can map the country information or region information through the information reported by the PTT client B.

The SIP / IP Core A receiving the INVITE receives the operation condition information indicating that the outgoing session prohibition flag value based on the network is 'on' and that the PTT client in the network of another country (Network B) does not want to invite it. After confirming, the session invitation to the PTT client B is stopped.

The SIP / IP core A notifies the PTT server A using the NOK signal that the session establishment for the PTT client B has been stopped (S57), and the PTT server A transmits the NOK signal to the SIP / IP core A. In step S58, the SIP / IP core A transmits a NOK signal to the PTT client A (S59).

FIG. 6A is a signal flow diagram of an embodiment in which PTT server A receives information from a SIP / IP core of a current network of a PTT client to be invited as a case of limiting an invitation in PTT server A. Referring to FIG.

If the PTT client A invites the PTT client B using the INVITE signal (S61), the SIP / IP core A routes the INVITE signal to the PTT server A (S62).

If the network-based originating session prohibition flag value preset by the PTT client A is 'on', the PTT server A sends a SUBSCRIBE signal to request the current network information of the PTT client B. In step S63, the SIP / IP core A informs the PTT server A via a NOTIFY signal to which network the PTT client B belongs.

The PTT server A compares the operation condition information previously set by the PTT client A with the current network information of the PTT client B transmitted from the SIP / IP core A to determine whether to invite the PTT client B.

For example, 'Network Dependent Outgoing-Session-Barring Flag = ON, Operating Condition = Other Country Network' is previously set in the PTT server A, and the current PTT client B identified through the SIP / IP Core A is currently different. If belonging to a national network (network B), the PTT server A stops inviting a session for the PTT client B.

The PTT server A notifies the SIP / IP core A via the NOK signal that the session setup for the PTT client B has been stopped (S68), and the SIP / IP core A transmits a NOK signal to the PTT client A ( S69).

The network information of the PTT client B is not only requested by the PTT server A using a SUBSCRIBE-NOTIFY signal, but also periodically updated by the SIP / IP core A of the PTT client B. Alternatively, it may be confirmed through a process of informing the PTT server A by using a PUBLISH signal whenever a change is made.

6B is a signal flow diagram illustrating a case in which PTT server A receives information on a current network of a PTT client to be invited from another application server as another embodiment of limiting an invitation in PTT server A. At this time, the application server is a location server (Location Server) or access server (Presence Server).

If the PTT client A invites the PTT client B using the INVITE signal (S61), the SIP / IP core A routes the INVITE signal to the PTT server A (S62).

The PTT server A requests the application server (location server or access server) for the current network information of the PTT client B when the network-based originating session prohibition flag value preset by the PTT client A is 'on'. In order to transmit a SUBSCRIBE signal to the SIP / IP core A (S63), the SIP / IP core A routes the SUBSCRIBE signal to the application server (location server or access server). S64).

The application server transmits a NOTIFY signal including information of a network to which the PTT client B currently belongs to the PTT server A via the SIP / IP core A (S66) (S67). At this time, the SIP / IP core A routes the NOTIFY signal received from the application server to the PTT server A.

The PTT server A determines whether to invite the PTT client B by comparing the operation condition information previously set by the PTT client A with the current network information of the PTT client B transmitted from the application server. At this time, the PTT server A should have a database that can map the network information received from the application with the country information or region information.

For example, 'Network Dependent Outgoing-Session-Barring Flag = ON, Operating Condition = Other Country Network' is previously set in the PTT server A, and the current PTT client B identified through the SIP / IP Core A is currently different. If belonging to a national network (network B), the PTT server A stops inviting a session for the PTT client B.

The PTT server A notifies the SIP / IP core A via the NOK signal that the session setup for the PTT client B has been stopped (S68), and the SIP / IP core A transmits a NOK signal to the PTT client A ( S69).

In another embodiment of the present invention, when the inviting PTT client A and the inviting PTT client B are clients of the same operator in the same country, but the service area of the operator is very large, the PTT client belonging to the Long Distance Service You can also restrict invitations.

In this case, the PTT client A sets a network-based outgoing session prohibition flag value and operation condition information set to restrict an invitation for a PTT client in a specific network B (Long Distance Service) to 'Network Dependent Outgoing-Session- Barring Flag'. = ON, operating condition = Long Distance Network '.

That is, in case of limiting the invitation of the PTT client belonging to the long distance area, the flag value and the operation condition information are set to 'Network Dependent Outgoing-Session-Barring Flag = ON, and the operation condition = Long Distance Network'. 5 and 6a and 6b is the same as the operation and details.

7, 8A, and 8B illustrate a PTT when an inviting PTT client A and an inviting PTT client B are clients of different operators in the same country, and the PTT client B moves to another country network or a long-distance network. Signal flow diagram illustrating a service restriction method. At this time, the PTT client A has previously set the network-based outbound session prohibition flag value and operation condition information to the PTT server A in order to restrict the invitation for the PTT client in a specific network C (another country network or long distance network). Assume that

7 illustrates a case in which an invitation is restricted according to operating condition information in a SIP / IP core.

When the PTT client A invites the PTT client B using the INVITE signal (S71), the PTT server A routes the INVITE signal to the SIP / IP core B of the home network B of the PTT client. do.

At this time, if the network-based originating session prohibition flag value preset by the PTT client A is 'on', the PTT server A adds the flag value and condition information on which the corresponding flag operates to an invitation signal. The transmission to the SIP / IP core B (S73). In other words, 'Network Dependent Outgoing-Session-Barring Flag = ON, Operating Condition = Foreign Network or Long Distance Network' is added to the INVITE signal.

The PTT Client B, initially a subscriber of Network B, moves to Network C (another country network or Long Distance Service network) and then uses the REGISTER signal to inform the SIP / IP Core B about the current network. As reported, the SIP / IP Core B knows that the PTT Client B has now moved to Network C. In this case, the SIP / IP Core B should include a database that can map the country information or region information through the information reported by the PTT client B.

The SIP / IP Core B receiving the INVITE receives the operation condition information indicating that the network-based originating session prohibition flag value is 'on' and that the PTT client in the network of another country (network C) does not want to invite it. After confirming, the session invitation to the PTT client B is stopped.

The SIP / IP Core B notifies the PTT server A using the NOK signal that the session setup for the PTT client B is stopped (S75), and the PTT server A transmits the NOK signal to the PTT client A (S77). ).

FIG. 8A is a signal flow diagram illustrating a case in which an invitation is restricted in PTT server A. The PTT server A receives information on a current network of a PTT client to be invited from the SIP / IP core.

When the PTT client A invites the PTT client B using the INVITE signal (S81), the PTT server A transmits a SUBSCRIBE signal to the SIP / IP core B of the home network B to transmit the PTT. The current network information of the client B is requested (S83).

The SIP / IP core B informs the PTT server A via a NOTIFY signal to which network the PTT client B belongs (S87).

The PTT server A compares the operation condition information previously set by the PTT client A with the current network information of the PTT client B transmitted from the SIP / IP core B to determine whether to invite the PTT client B.

For example, the current PTT client identified through 'SIP / IP Core B' is preconfigured with 'Network Dependent Outgoing-Session-Barring Flag = ON, Operating Condition = Other Country Network or Long Distance Service' in the PTT server A. If B currently belongs to another country network (network C), the PTT server A stops inviting the session for the PTT client B.

The PTT server A informs the PTT client through the NOK signal that the session establishment for the PTT client B has been stopped (S89).

The network information of the PTT client B may be requested by the PTT server A using a SUBSCRIBE-NOTIFY signal as well as the SIP / IP core B may request the PTT server A from the PTT server B. The network information may be checked periodically or whenever the PTT server A is informed using a PUBLISH signal.

FIG. 8B is a signal flow diagram illustrating another embodiment of restricting an invitation in the PTT server A, in which the PTT server A receives information on a current network of the PTT client to be invited from the application server.

When the PTT client A invites the PTT client B using the INVITE signal (S81), the PTT server A sends the SUBSCRIBE signal to the SIP / IP core B of the home network B of the PTT client B. In step S83, the SIP / IP Core B routes the SUBSCRIBE signal to the application server (S84). At this time, the application server is a location server B or access server B.

The application server transmits a NOTIFY signal including information of a network to which the PTT client B currently belongs to the SIP / IP core B (S86), and the SIP / IP core B sends the NOTIFY signal. Routing to the PTT server A (S87).

The PTT server A determines whether to invite the PTT client B by comparing the operation condition information previously set by the PTT client A with the current network information of the PTT client B transmitted from the application server.

For example, the current PTT client identified through 'SIP / IP Core B' is preconfigured with 'Network Dependent Outgoing-Session-Barring Flag = ON, Operating Condition = Other Country Network or Long Distance Service' in the PTT server A. If B currently belongs to another country network (network C), the PTT server A stops inviting the session for the PTT client B.

The PTT server A informs the PTT client through the NOK signal that the session establishment for the PTT client B has been stopped (S89).

In addition, the network information of the PTT client B, the PTT server A requests the PTT server A to the PTT server A, as well as the request for the PTT server A using a SUBSCRIBE- confirm (NOTIFY) signal The network information of B may be checked periodically or whenever the PTT server A is informed using a PUBLISH signal.

9 is a signal flow diagram illustrating a PTT service restriction method when an inviting PTT client A wants to exclude a PTT client B, which is an operator of another country or a client of a specific group, from an invitation. At this time, the PTT client A is a network-based outgoing session prohibition flag value and operating condition information to the PTT server A in advance to limit the invitation to the PTT client in a specific network B (other country operators) or a specific group Suppose

The PTT client A transmits an INVITE signal to the PTT server A in order to invite the PTT client B (S91). At this time, the PTT server A sets a network-based origination session prohibition flag value preset by the PTT client A. And condition information under which the corresponding flag operates, and the flag value and the operation condition information are 'Network Dependent Outgoing-Session-Barring Flag = ON, and operation condition = another country operator or specific group'.

The PTT server A checks the Uniform Resource Identifier (URI) of the invited PTT client B and checks whether it is a client of another country operator or a specific group (S93). In this case, the URI may be a telephone URI or a SIP URI.

In the PTT server A, the network-based outgoing session prohibition flag value is 'on', and after confirming the operation condition information that the PTT client of another country operator or a specific group does not invite, the URI of another country operator or a specific group is input. Suspend the session invitation for the PTT Client B having the session. Then, the PTT server A informs the PTT client A by using the NOK signal that the session establishment for the PTT client B is stopped (S95).

For example, when a PTT client A, a client of a domestic operator, invites one or more PTT clients, the PTT server A checks URIs of the invited PTT clients and selects clients of other national operators. If the country code of the telephone number URI of the invited PTT client B is another country (+ 081-XXX-XXX-XXXX) or has a SIP URI (sip: jenny@ntt.com) of another country operator, the PTT server A Does not invite the PTT client B. At this time, the PTT server A should have a database for determining whether the PTT client invited through the URI is a subscriber of another country operator or a member of a group of other country subscribers.

5 to 9 illustrate a case in which an inviting PTT client restricts an invitation for a PTT client satisfying a network-based origination session prohibition flag value and condition information on which the flag operates. The network information, such as the operation condition information, has been described on the assumption that it is set in advance in the PTT server before the INVITE signal is transmitted.

However, the network-based origination session prohibition flag value and operation condition information may be directly loaded on an INVITE signal transmitted by a PTT client. That is, the inviting PTT client includes the flag value and the operation condition information in the INVITE signal and transmits it, and the PTT server confirms the flag value and the operation condition information from the INVITE signal.

FIG. 10 is a signal flow diagram illustrating a PTT service method in which an invited PTT client restricts an invitation according to the present invention, and is a method of limiting an invitation received from another country or a long distance region.

First, the PTT client B uses the network-dependent incoming session-barring flag value and operating condition information to restrict invitations transmitted from a specific network A (another country network or a long-distance area network). Is set in advance on the PTT server B.

When an invitation signal (INVITE) for inviting the PTT client B is transmitted to the PTT server B (S101), the PTT server B operates under the condition that the incoming session prohibition flag value preset by the PTT client B and the corresponding flag operate. Check the information to confirm the source of the INVITE signal.

For example, when 'Network Dependent Incoming-Session-Barring Flag = ON, Operating Condition = Other Country Network or Long Distance Network or Other Country Subscriber Number' is set in the PTT server B, the PTT server B is the invitation. Check whether the (INVITE) signal is an INVITE signal received from another country network or a long-distance area network or an INVITE signal transmitted by another country subscriber.

The PTT server B stops the session invitation to the PTT client B after confirming the operating condition information that the PTT client B does not want to be invited from the network or long-distance regional network or subscribers of the other country.

The PTT server B informs the network A side that the session establishment has been stopped using the NOK signal (S103).

5 to 10, when the invited PTT client satisfies the network-based originating session prohibition flag value and the condition information for operating the flag, the PTT server immediately restricts the invitation for the PTT client. do. When the inviting PTT client satisfies the network-based incoming session prohibition flag value and the condition information for operating the flag, the PTT server immediately restricts the invitation from the PTT client.

However, in the embodiment of Figs. 5 to 10, the outgoing session prohibition flag value and the condition information under which the flag operates based on the network or the incoming session prohibition flag value and the condition information under which the corresponding flag operates as The PTT server may further add a process for the PTT client (PTT user) who sets the condition to determine the invitation restriction for the satisfied PTT client.

FIG. 11 is a signal flowchart illustrating an embodiment in which the PTT server further confirms an invitation restriction to FIG. 6A.

When the PTT client A invites the PTT client B using the INVITE signal (S110), the SIP / IP core A routes the INVITE signal to the PTT server A (S111).

The PTT server A transmits a SUBSCRIBE signal to the SIP / IP core A in order to request the current network information of the PTT client B (S112), and the SIP / IP core A indicates which PTT client B The PTT server A is informed through a NOTIFY signal (S113). In this case, it is assumed that the originating session prohibition flag value set in the PTT server A is 'on', the operation condition information of the flag is 'another country network', and the PTT client exists in another country network.

The PTT server transmits a DECISION signal including the network information of the PTT client B to the PTT client A regardless of the set flag value and condition information, thereby continuing or stopping the session establishment with the PTT client B. Inquire (S114). In this case, the DECISION signal may include overseas network address information or domestic network address information, or remote / near network address information and billing related information.

The PTT server A waits for transmission of an INVITE signal for inviting the PTT client B until a response to the DECISION signal is transmitted. At this time, by setting a timer for limiting the waiting time, when the waiting time expires, the PTT server A restricts the invitation according to the preset operation condition information.

Upon receiving the DECISION signal, the PTT client A determines whether to continue the session establishment and transmits the decision value to the PTT server through a DECISION ACK signal (S115).

Here, suppose that the PTT client A transmits a DECISION ACK signal including a value instructing to continue the session establishment for the PTT client B.

The PTT server A receiving the DECISION ACK signal transmits the invitation signal to the PTT client B through the SIP / IP core A (S116) (S117), and the PTT client B sends the The SIP / IP core A transmits a response (200 OK) signal to the PTT server A to the PTT server A (S119). The PTT server A transmits the response (200 OK) signal to the PTT client A, thereby establishing a session between the PTT client A and the PTT client B.

As described above, when the PTT server confirms to the PTT client about the session establishment, the decision of the PTT client has priority over the invitation restriction based on the flag value and condition information preset in the PTT server.

For example, 'Network Dependent Outgoing-Session-Barring Flag = ON, Operating Condition = Other Country Network' is previously set in the PTT server A, and the current PTT client B identified through the SIP / IP Core A is currently different. If it belongs to a national network (network B), if the PTT client A determines to establish a session, the PTT server A establishes a session with the PTT client B regardless of a preset condition.

In addition, an invitation from a specific PTT client may be restricted using the DECISION signal and the DECISION ACK signal.

12 is a signal flow diagram illustrating a PTT service restriction method when the PTT client B roams to another network after inviting a PTT client B existing in the same network to establish a session. At this time, the PTT client A has previously set the network-based outbound session prohibition flag value and operation condition information to the PTT server A in order to limit the invitation for the PTT client in a specific network B (another country network or long-distance regional network). Assume that

First, the PTT client A and the PTT client B belong to the same national network or the same operator, and the PTT server restricts the PTT service.

When the PTT client A invites the PTT client B using the INVITE signal, the SIP / IP core A routes the INVITE signal to the PTT server A (S121).

If the network-based originating session prohibition flag value preset by the PTT client A is 'on', the PTT server A sends a SUBSCRIBE signal to request the current network information of the PTT client B. In step S122, the SIP / IP core A informs the PTT server A via a NOTIFY signal to which network the PTT client B belongs (S123).

The PTT server A confirms that the PTT client A and the PTT client B are the same network, and transmits the invitation signal to the PTT client B through the SIP / IP core A (S124). That is, since the PTT client B does not satisfy the condition information, the PTT service restriction does not occur.

The PTT client B receiving the invitation signal transmits a response (200 OK) to the PTT server A via the SIP / IP core A (S125), and the PTT server A responds (200 OK). By transmitting a signal to the PTT client A via the SIP / IP core A (S126), the PTT client A and the PTT client B are session established.

If the PTT client B roams to the network B while the session is established between the PTT client A and the PTT client B (S127), the network-based outgoing session in which the PTT server A presets network information of the current PTT client B is set. The prohibition flag value is compared with the condition information under which the flag operates (S128). In this case, the PTT client B, which is a subscriber of the network A, first moves to network B and transmits a register signal to the SIP / IP core A to register the currently located network. It can be seen that the PTT client B roams to the current network B. The SIP / IP core A notifies the PTT server A through a report signal that the PTT client B roams.

The PTT server checks the condition information that the network-based originating session prohibition flag value is 'on' and that a client in another network (network B) does not want to invite, and then sessions with the PTT client A and the PTT client B. The session between the PTT client A and the PTT client B is released by transmitting a RELEASE signal (S129).

As described above, when the PTT client roams to another network to limit the PTT service during session establishment, not only the PTT server but also the SIP / IP core may limit the PTT service.

As described above, when the invited PTT client B moves to another region (other network, PTT server area, etc.) during the session, the PTT server or the SIP / IP core is connected to the session according to the condition information of the inviting PTT client A. Can be terminated.

In addition, if the invited PTT client B moves to another region (other network, PTT server area, etc.) during the session, the PTT server or SIP / IP core may terminate the session according to the preference information of the invited PTT client B. Can be.

When the inviting PTT client A moves to another region (another network, another PTT server area, etc.) while performing a session with the invited PTT client B, the corresponding PTT client A performs the session according to the preference information of the PTT client A. You can exit.

In addition, when the inviting PTT client A moves to another region (another network, another PTT server region, etc.) while performing a session with the invited PTT client B, the session is performed according to the preference information of the PTT client B. You can also exit.

FIG. 13A is a signal flow diagram illustrating an embodiment of further adding a process of limiting an invitation according to the determination of the PTT client in FIG. 10. At this time, the PTT client B is a network-based incoming session barring flag (Network Dependent Incoming-Session-Barring Flag) value and operation condition information to limit the invitation sent from a specific network A (other country network or long-distance regional network) It is assumed that is set in advance in the PTT server B.

When the PTT server B receives an INVITE signal to invite the PTT client B from the network A (S131), the PTT server B invites the PTT client regardless of the preset flag value and operation condition information. The signal (INVITE) is transmitted (S133). In this case, the INVITE signal includes information for determining the inviter's network (for example, overseas network address information or domestic network address information or remote / near network address information, etc.) and billing related information.

Upon receiving the invitation signal, the PTT client B determines whether to participate in the session, and transmits a response signal to the invitation signal to the PTT server B (S137). In this case, the response signal in case of participating in the session is 200 OK, and the response signal in case of not participating in the session is NOK.

The PTT server B transmits the response signal received from the PTT client B to the network A side (S139).

FIG. 13B is a signal flow diagram illustrating another example of adding a process of limiting an invitation according to the determination of the PTT client in FIG. 10, wherein the PTT client B transmits a response signal to the INVITE signal. In this case, a request signal for waiting for transmission is transmitted to the PTT server B.

When the PTT server B receives an INVITE signal for inviting the PTT client B from the network A (S131), the PTT B invites the PTT client regardless of the preset flag value and operation condition information. The signal (INVITE) is transmitted (S133). In this case, the INVITE signal includes information for determining the inviter's network (for example, overseas network address information or domestic network address information or remote / near network address information, etc.) and billing related information.

After receiving the invitation signal, the PTT client B transmits a request signal to wait for transmission of a response signal to the invitation signal until it is determined whether to participate in the session invitation (S135). The request signal is 183 Session Progress or 202 Accepted or 180 Ringing or a third signal that does not exist previously.

The PTT client B determines whether to participate in the session, and transmits a response signal for the invitation signal (INVITE) to the PTT server B (S137). In this case, the response signal in case of participating in the session is 200 OK, and the response signal in case of not participating in the session is NOK.

The PTT server B transmits the response signal received from the PTT client B to the network A side (S139).

As shown in FIGS. 13A and 13B, when the PTT server confirms whether to participate in the session to the PTT client invited to the session, a flag value and condition information preset by the PTT client is determined in the PTT server. Priority over invitation limits by.

FIG. 14 illustrates an XML document of network information set by a PTT client to restrict a session. In the case of an incoming session, FIG. 14 restricts an international invitation. Limit it. In this case, the network information includes a network-based incoming session prohibition flag, an operation condition information of the corresponding flag, a network-based origination session prohibition flag, an operation condition information of the corresponding flag, and the like.

5 to 9 and 11, the condition is satisfied using the outgoing-session-barring-flag based on the network and the operation condition information of the flag set in the PTT server. Inviting PTT clients can be restricted.

However, whether to apply outgoing-session-barring-override-flag to the PTT server by setting an outgoing-session-barring-override-flag on the user's terminal to apply the flag and operation condition information preset to the PTT server at the session invitation May be determined by the user. At this time, the outgoing session prohibition invalid flag is included in a header or body of an INVITE signal transmitted by a PTT client and transmitted to the PTT server.

When the originating session prohibition invalid flag set by the user is transmitted to the PTT server, the PTT server operates as follows.

If the outgoing session prohibition invalid flag is 'true', the session connection is performed regardless of the outgoing session prohibition flag and operation condition information, pre-stored profile, and operator principle information preset in the PTT server. For example, the PTT server invalidates the outgoing session prohibition flag previously stored in the PTT server without informing the invitee of the presence of the invitee who has moved to another country subscriber or another country network and the corresponding billing information. Regardless of which session is connected.

If the outgoing session prohibition invalid flag is 'False', the outgoing session prohibition flag is operated according to the outgoing session prohibition flag, operating condition information, pre-stored profile, and operator principle information preset in the PTT server. For example, the inviter may follow the invitee's decision by informing the invitee of whether or not the subscriber has moved to another country or the network of the other country, and the corresponding billing information. It operates according to the originating session prohibition flag and operating condition information.

15A and 15B are implementation diagrams expressing the origination session prohibition invalid flag in the Session Description Protocol (SDP) and XML document formats.

In FIG. 15A, 'b = true' means that the value of the originating session prohibition invalid flag is 'true', and 'b' is a character quoted from the first character of 'barring'.

The present invention is a network even when the original home network of the PTT client A or the PTT client A roams to another network area (or another PTT server area) to perform a PTT service in a set home network. Outgoing session based prohibition / network based incoming session prohibition (OSB / ISB) may be performed.

The condition of the session barring described in the present invention is not limited to location information such as roaming and remote location, and may be interrupted by various conditions by the application server under the user's setting.

That is, an application server interrupts a session by using various state information such as PTT session state information, PTT subscriber's own state information, invited subscriber state information, and invited PTT subscriber's service provider domain. Can be done.

As described above, the method for restricting PTT service according to the present invention sets network information for inviting clients to be invited to the PTT session and invited clients, and invites or invites clients that match the network information. The user convenience can be increased because it can be restricted automatically by restricting the selection and selectively adjusting the network information.

In addition, the PTT service restriction method according to the present invention occurs in the process of establishing a session between the client inviting the PTT session and the client that is invited or invited by using the network information by limiting the network that is invited to exist in different networks This can reduce the billing problem.

Claims (72)

Setting network information for limiting session establishment by a first PTT client; Determining whether a network of a second PTT client to establish a session with the first PTT client satisfies the set network information; If satisfied, the first PTT client restriction method of the PTT service, characterized in that configured to stop the session establishment with the second PTT client. The method of claim 1, If it is not satisfied, the first PTT client and the second PTT client further comprises the step of establishing a session, the PTT service restriction method characterized in that it is configured. The method of claim 1, wherein the network information A network based Outgoing-Session-Barring Flag for inputting whether to limit the inviting network; Operating condition information for operating the network-based originating session prohibition flag; A network based incoming session prohibition flag for inputting whether or not to restrict the invited network (Network Dependent Incoming-Session-Barring Flag); And at least one or more of operation condition information for operating the network-based incoming session prohibition flag. The method of claim 3, wherein the operating condition information PTT service restriction method characterized in that it exists only when the flag exists. The method of claim 3, wherein If the network-based outgoing session prohibition flag value is 'on', limiting the inviting network. The method of claim 3, wherein If the network-based incoming session prohibition flag value is 'ON', the network to be invited is restricted. A PTT service system in which a first PTT client invites one or more PTT clients to establish a session, Setting network information by the first PTT client to limit an invitation for a PTT client in a specific network; Restriction method of the PTT service, characterized in that configured to limit the invitation to the PTT client that satisfies the set network information from the invited PTT client. The method of claim 7, wherein the network information is A network based Outgoing-Session-Barring Flag for inputting whether to limit the inviting network; Method for limiting the PTT service, characterized in that the network-based outgoing session prohibition flag is configured with operating condition information for operating. The method of claim 8, If the network-based outgoing session prohibition flag value is 'on', limiting the inviting network. The method of claim 7, wherein the network information is Before the first PTT client transmits an INVITE signal to one or more PTT clients, the first PTT client stores the information on the first PTT server or loads the invitation signal to the first PTT server. How to Restrict Services. 8. The process of claim 7, wherein the step of limiting the invitation is Limiting an invitation by a SIP / IP server of a network managing a PTT client satisfying the set network information; And a first PTT server managing the first PTT client, wherein the first PTT server is configured to limit an invitation. The process of claim 11, wherein the SIP / IP server restricts the invitation. Transmitting, by the first PTT server, the set network information on an invitation signal; Restricting the PTT service, characterized in that configured to limit the invitation for the PTT client that satisfies the network information is set SIP / IP receiving the invitation (INVITE) signal. The process of claim 11, wherein the first PTT server restricts the invitation. Identifying a current network of PTT clients invited from a SIP / IP server of a network managing a PTT client satisfying the network information and limiting invitations to PTT clients satisfying the network information; Identifying a current network of PTT clients invited from an application server of a network managing a PTT client satisfying the set network information and limiting invitations to PTT clients satisfying the network information; PTT service restriction method comprising the process of limiting the invitation based on the URI of the invited PTT client. The method of claim 13, wherein the application server PTT service restriction method, characterized in that the location server or access server. The process of claim 11, wherein the first PTT server restricts the invitation. Transmitting, by the PTT server, information about PTT clients that are invited and a signal confirming whether or not to participate in a session to the first PTT client; Receiving a response signal for the signal from the first PTT client, and further comprising the step of limiting the invitation to the PTT client according to the response signal. The method of claim 15, When the response signal commands session participation, establishing, by the PTT server, a session with the PTT clients regardless of the set network information; And when the response signal instructs the user not to join the session, the PTT server is configured to limit the invitation of the PTT clients according to the set network information. In a PTT service in which the first PTT client of the first network sets network information to limit an invitation of a second PTT client moving from a first network to a second network by a first PTT client of a first network, Receiving, by the first PTT server, an INVITE signal transmitted by the first PTT client through a first SIP / IP core; Transmitting, by the first PTT server, the network information on an INVITE signal to the first SIP / IP core; The first SIP / IP core checks the current network of the second PTT client, and notifies the first PTT client that the session establishment has been stopped using the NOK signal when the second PTT client belongs to the second network. PTT service restriction method characterized in that the process is configured. 18. The method of claim 17, wherein the network information is A network based Outgoing-Session-Barring Flag for inputting whether to limit the inviting network; Method for limiting the PTT service, characterized in that the network-based outgoing session prohibition flag is configured with operating condition information for operating. The method of claim 18, If the network-based outgoing session prohibition flag value is 'on', limiting the inviting network. 18. The method of claim 17, wherein the network information is Before the first PTT client transmits the invitation signal (INVITE), the PTT service restriction method, characterized in that stored in the first PTT server or loaded on the invitation signal (INVITE) to the first PTT server. The method of claim 17, wherein the invitation signal is The method of claim 1, further comprising an outgoing session prohibition invalid flag invalidating network information set in the first PTT server. In a PTT service in which a first PTT client of the first network sets network information to limit an invitation of a second PTT client moving from a first network to a second network, Receiving, by a first PTT server, an INVITE signal transmitted by the first PTT client through a first SIP / IP core; Identifying, by the first PTT server, the current network of the second PTT client; And if the second PTT client belongs to the second network, notifying the first PTT client that the session establishment has been suspended using the NOK signal. The method of claim 22, wherein the network information is A network based Outgoing-Session-Barring Flag for inputting whether to limit the inviting network; PTT service restriction method, characterized in that the network-based outgoing session prohibition flag is configured with operating condition information for operating. The method of claim 23, If the network-based outgoing session prohibition flag value is 'on', limiting the inviting network. The method of claim 22, wherein the network information is Before the first PTT client transmits the invitation signal (INVITE), the PTT service restriction method, characterized in that stored in the first PTT server or loaded on the invitation signal (INVITE) to the first PTT server. 23. The method of claim 22, wherein identifying the current network of the second PTT client comprises: Identifying, by the first PTT server, the current network of the second PTT client from the first SIP / IP core; And the first PTT server confirms a current network of the second PTT client from an application server. The method of claim 26, wherein the application server PTT service restriction method, characterized in that the location server or access server. The method of claim 22, After the first PTT server checks the current network of the second PTT client, the PTT server transmits a signal to the first PTT client to confirm information about the second PTT clients and whether or not to join the session; ; And receiving a response signal for the signal from the first PTT client to limit the invitation to the second PTT client according to the response signal. The method of claim 28, When the response signal instructs session participation, the PTT server establishing a session with the second PTT client regardless of the set network information; And when the response signal instructs the session not to participate, the PTT server is configured to limit the invitation of the second PTT clients according to the set network information. The method of claim 22, wherein the invitation signal is The method of claim 1, further comprising an outgoing session prohibition invalid flag invalidating network information set in the first PTT server. In a PTT service in which network information is set to limit a connection of a first PTT client of a first PTT network with one or more PTT clients of a second network moved to a third network, Transmitting, by the first PTT client, an INVITE signal to the first PTT server; Transmitting, by the first PTT server, the network information on an INVITE signal to a second SIP / IP core of the second network; The second SIP / IP core is configured to notify the first PTT client by using a NOK signal that the session setup with the PTT client moved to the third network is stopped. . 32. The system of claim 31 wherein the network information is A network based Outgoing-Session-Barring Flag for inputting whether to limit the inviting network; Method for limiting the PTT service, characterized in that the network-based outgoing session prohibition flag is configured with operating condition information for operating. 32. The system of claim 31 wherein the network information is Before the first PTT client transmits the invitation signal (INVITE), the PTT service restriction method, characterized in that stored in the first PTT server or loaded on the invitation signal (INVITE) to the first PTT server. The method of claim 31, wherein the invitation signal is The method of claim 1, further comprising an outgoing session prohibition invalid flag invalidating network information set in the first PTT server. In a PTT service in which network information is set to limit a connection of a first PTT client of a first PTT network with one or more PTT clients of a second network moved to a third network, Receiving, by the first PTT server, an INVITE signal from the first PTT client; Confirming, by the first PTT server, a current network of a second PTT client from a second PTT network; And the first PTT server is configured to notify the first PTT client using a NOK signal that the session setup with the PTT client moved to the third network is stopped. 36. The network of claim 35, wherein said network information is A network based Outgoing-Session-Barring Flag for inputting whether to limit the inviting network; Method for limiting the PTT service, characterized in that the network-based outgoing session prohibition flag is configured with operating condition information for operating. 36. The network of claim 35, wherein said network information is Before the first PTT client transmits the invitation signal (INVITE), the PTT service restriction method, characterized in that stored in the first PTT server or loaded on the invitation signal (INVITE) to the first PTT server. 36. The method of claim 35, wherein identifying the current network of the second PTT client comprises: Identifying, by the first PTT server, the current network of the second PTT client from a second SIP / IP core of the second network; And the first PTT server checking the current network of the second PTT client from the application server of the second network. The method of claim 38, wherein the application server PTT service restriction method, characterized in that the location server or access server. 36. The method of claim 35 wherein After the first PTT server confirms the current network of the second PTT client, the first PTT server transmits a signal to the first PTT client to confirm the information about the second PTT client and whether or not to participate in the session Process; And receiving a response signal for the signal from the first PTT client to limit the invitation to the second PTT client according to the response signal. The method of claim 40, When the response signal instructs session participation, the PTT server establishing a session with the second PTT client regardless of the set network information; And when the response signal instructs the session not to participate, the PTT server is configured to limit the invitation of the second PTT clients according to the set network information. The method of claim 35, wherein the invitation signal is The method of claim 1, further comprising an outgoing session prohibition invalid flag invalidating network information set in the first PTT server. In a PTT service in which network information is set such that a first PTT client of a first network restricts an invitation for a second PTT client not belonging to the first network, Receiving, by a first PTT server, an INVITE signal sent by the first PTT client; And the first PTT server checks the URI of the second PTT client and notifies the first PTT client that the session setup is interrupted using the NOK signal. 44. The method of claim 43, wherein the first PTT server is PTT service restriction method characterized in that it comprises a database to determine which network belongs to the URI. 44. The network of claim 43, wherein said network information is A network based Outgoing-Session-Barring Flag for inputting whether to limit the inviting network; Method for limiting the PTT service, characterized in that the network-based outgoing session prohibition flag is configured with operating condition information for operating. The method of claim 45, If the network-based outgoing session prohibition flag value is 'on', limiting the inviting network. 44. The network of claim 43, wherein said network information is Before the first PTT client transmits the invitation signal (INVITE), the PTT service restriction method, characterized in that stored in the first PTT server or loaded on the invitation signal (INVITE) to the first PTT server. The method of claim 43, After the first PTT server checks the URI of the second PTT client, the first PTT server transmits a signal to the first PTT client to confirm information about the second PTT clients and whether or not to join the session; and; And receiving a response signal for the signal from the first PTT client to limit the invitation to the second PTT client according to the response signal. 49. The method of claim 48 wherein When the response signal instructs session participation, the first PTT server establishing a session with the second PTT client regardless of the set network information; And when the response signal instructs the user not to participate in the session, the first PTT server configured to limit the invitation of the second PTT clients according to the set network information. The method of claim 43, wherein the invitation signal is The method of claim 1, further comprising an outgoing session prohibition invalid flag invalidating network information set in the first PTT server. In a PTT service between PTT clients existing in the same network, Transmitting, by the first PTT client, an INVITE signal to a second PTT client belonging to a first network; Establishing a session between the first PTT client and the second PTT client; When the second PTT client roams to a second network, the first network comparing the network of the second PTT client with preset network information; When the network of the second PTT client satisfies predetermined network information, the first network transmits a RELEASE signal to the first PTT client and the second PTT client. Restrictions on Services. 52. The apparatus of claim 51, wherein the network information comprises: a network-based outgoing-session-barring flag for inputting whether to limit an inviting network; Method for limiting the PTT service, characterized in that the network-based outgoing session prohibition flag is configured with operating condition information for operating. 53. The network of claim 51 wherein the network information is Before the first PTT client transmits the invitation signal (INVITE), the PTT service restriction method, characterized in that stored in the first PTT server or loaded on the invitation signal (INVITE) to the first PTT server. 53. The method of claim 51, wherein the first network compares network information. Verifying, by the first SIP / IP core of the first network, network information from the first PTT server of the first network; And comparing the network information with the current network of the second PTT client. 53. The method of claim 51, wherein the first network compares network information. Receiving, by the first PTT server, the current network of the second PTT client from the first SIP / IP core; And comparing the current network with predetermined network information of the second PTT client. Storing, by the first PTT client, network information in the first PTT server to restrict invitation to a specific network; If the inviting network satisfies the set network information, the first PTT server restriction method characterized in that configured to limit the invitation. 59. The network of claim 56 wherein the network information is A network based outgoing session-barring flag for inputting whether to limit a network inviting the first PTT client; And the operation condition information for operating the network-based incoming session prohibition flag. The method of claim 57, If the network-based incoming session prohibition flag value is 'ON', limiting the inviting network. 59. The process of claim 56, wherein the first PTT server restricts the invitation The first PTT server informing a first PTT client of a signal for confirming whether to join the session and information of an inviting network; And receiving a response signal to the signal from the first PTT client to limit the invitation according to the response signal. The method of claim 59, When the response signal instructs session participation, the first PTT server establishing a session regardless of the set network information; And when the response signal instructs the user not to participate in the session, the first PTT server configured to limit the invitation of the network according to the set network information. In a PTT service that has set network information to restrict invitation of a first PTT client of a first network to a second network, Receiving, by the first PTT server, an INVITE signal from the second network; And the first PTT server compares the network information with information of the second network, and notifies the second network that the session setup has been stopped using the NOK signal. 62. The method of claim 61 wherein the network information is A network-based incoming session prohibition flag (Network Dependent Outgoing-Session-Barring Flag) for inputting whether to limit a network inviting the first PTT client; And the operation condition information for operating the network-based incoming session prohibition flag. 62. The method of claim 61, wherein transmitting the session establishment result to a second network comprises: Transmitting, by the first PTT server, a signal to confirm information on a second network and whether to participate in a session to a first PTT client; Receiving, by the first PTT client, a response signal to the signal; And the first PTT server further comprises limiting the invitation according to the response signal. The method of claim 63, wherein After receiving the signal for confirming whether or not to participate in the session, the first PTT client further comprises the step of transmitting a signal instructing the first PTT server to suspend transmission of the response signal for the invitation signal PTT service restriction method, characterized in that. The method of claim 63, wherein When the response signal instructs session participation, the first PTT server establishing a session regardless of the set network information; And when the response signal instructs the user not to participate in the session, the first PTT server configured to limit the invitation of the network according to the set network information. In a PTT system in which a network-based outbound session prohibition flag and operating condition information are set in a PTT server to restrict invitations to specific PTT clients, When the outgoing session inhibit invalid flag (Outgoing-Session-Barring-Override-Flag) transmitted by the user is set, the PTT may be set regardless of the set outgoing session inhibit flag and operation condition information. How to Restrict Services. The method of claim 66, wherein If the outgoing session prohibition invalid flag is not set, an invitation is restricted according to the set outgoing session prohibition flag and operation condition information. 67. The system of claim 66 wherein the originating session prohibition invalid flag is Method for limiting PTT service, characterized in that included in the header or body of the invitation signal transmitted from the terminal. Setting a PTT session establishment condition in an application server; Receiving, by the application server, the PTT session establishment request and comparing the session establishment condition with a current session establishment state; PTT service restriction method, characterized in that consisting of the process of selectively performing the session connection according to the comparison result. 70. The method of claim 69, wherein the application server PTT service restriction method, characterized in that the PTT server. The method of claim 69, If the session establishment condition and the current session establishment state is the same, PTT service restriction method characterized in that the PTT session connection process is terminated. The method of claim 69, If the session establishment condition and the current session establishment state is different, PTT service restriction method characterized in that for performing a PTT session connection.

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