KR100862678B1 - Method and system for providing video message service in dual mode communication network - Google Patents

Abstract

A video message service supply method in a dual-mode communication network and a system therefor are provided to offer a video message service even when a receiving terminal roams to another communication network, and to supply the video message service to a user, thereby executing usage of a video call. A video message server(140) records a video message to be transmitted to a receiving terminal(190). An HLR(Home Location Register)(170) decides to which one of WCDMA(Wideband Code Division Multiple Access) and CDMA networks is connected with the receiving terminal. If the receiving terminal is connected with the WCDMA network, the video message server opens a video speech path to the receiving terminal to reproduce the recorded video message. If the receiving terminal is connected to the CDMA network, the video message server transmits the recorded video message through a multimedia message server(165).

Description

Method and system for providing video message service in dual mode communication network {Method and system for providing visual messaging service in a dual mode wireless system}

1 is a block diagram of a video message service providing system according to an embodiment of the present invention.

2 is a flowchart for recording a video message in a video message service providing method according to an embodiment of the present invention.

3 is a flowchart illustrating a method of providing a video message service according to a network to which a called terminal is connected in the method of providing a video message service according to an embodiment of the present invention.

4 is a flowchart illustrating providing a video message service to a called terminal roaming on a second generation communication network in a method for providing a video message service according to an embodiment of the present invention.

5 is a flowchart illustrating providing a video message service to a called terminal connected to a third generation communication network in a method of providing a video message service according to an embodiment of the present invention.

* Description of the main parts of the drawings *

110: calling base station 120: calling base station controller

130: calling side exchange 140: video message server

150: originating home location register 160: terminal information providing server

165: Multimedia Message Server 170: Receive Home Location Register

175: gateway exchange 180: destination exchange

182: terminating base station controller 184: terminating base station

The present invention relates to video communication, and more particularly, to a method and a system for providing a video message service in a dual mode communication network that differs in a method of transmitting a video message according to a communication network to which a called terminal is connected.

The demand for communication services is rapidly increasing, including the generalization of information and communication services, the emergence of various multimedia services, and the emergence of high quality services. Various mobile communication technologies are emerging to satisfy these demands.

Currently used mobile communication systems include a second generation mobile communication system using a code division multiple access (CDMA) system and a third generation mobile communication system using a wideband code division multiple access (WCDMA) system. On the other hand, the second generation mobile communication system was not enough to provide voice-oriented services, but it was difficult to support services such as high capacity data communication and international roaming.

As such, the demand for voice-oriented services is saturated, and the demand for multimedia is increasing as the user's expectation level for the service is increased. Thus, in the second generation mobile communication that performs voice-oriented services, the third generation mobile communication that performs a service for transmitting and receiving a large amount of data such as a video call service that makes a call while watching the other party's appearance has emerged.

The mobile communication network commonly used in Korea is a CDMA 2nd generation network and a WCDMA 3rd generation network. Depending on the service provider that provides the service, there is a service provider that provides only the second generation network, or provides both the second and third generation network. As such, a network providing a service to a user terminal using a second generation and a third generation while coexisting with a second generation and a third generation communication network may be referred to as a dual mode communication network.

In addition, the communication network used may vary according to the user's terminal. Recently, terminals supporting second and third generation communication networks have been released and used. Also in a user terminal, a terminal manufactured to be connected to a second generation and third generation communication network may be referred to as a dual mode terminal.

Therefore, the communication network to which the terminal is connected may vary according to the type of the terminal of the user and the type of network provided by the mobile communication provider. In particular, even a terminal capable of receiving third generation service may receive a service through a second generation communication network due to a deteriorated channel state even in a region where the third generation service may not receive service or a third generation network service area.

As described above, roaming refers to roaming by moving to another type of communication network or another operator's network and searching for a channel and using another type of communication network by using the found channel information.

On the other hand, with the advent of the 3rd generation wireless communication method, by using a camera mounted on a mobile communication terminal, the caller and the receiver can transmit a video recorded in real time to the terminal of the caller and the called party so that they can talk while looking at each other. Video call service is being provided.

However, although the video call service has an advantage of being serviced in real time, the service may be performed when the call is in a call connection state with the counterpart through bidirectional communication. Therefore, either one is not connected to the mobile communication system or the connection state is poor, so that the video call service cannot be provided.

Alternatively, although the calling terminal may receive a video call service, the called terminal may not be provided with the video call service when the calling terminal is roaming in the second generation communication network without being connected to the third generation wireless communication network. In addition, the caller has a desire to unilaterally transmit his / her doctor or his / her appearance to the other party, and thus, it is necessary to effectively transmit a video message without establishing a communication path between the caller and the called party.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method and system for providing a video message service which can vary the method of transmitting a video message according to a network to which a called terminal is connected.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a video message service providing method according to an aspect of the present invention comprises the steps of: (a) recording a video message to be sent to the called terminal; (b) determining whether the called terminal is roamed to a second generation communication network; And (c) transmitting the recorded video message to the called terminal according to the determination.

According to another aspect of the present invention, a method for providing a video message service includes: (a) connecting and recording a video message to be transmitted to a called terminal; (b) determining a type of communication network to which the called terminal is connected; (c) transmitting a video message according to the determined type of communication network.

In order to achieve the above object, a video message service providing system according to another aspect of the present invention includes a video message server for recording a video message to be transmitted to a called terminal; And a home location register for determining whether the called terminal is connected to a WCDMA communication network or a CDMA communication network, wherein the video message server transmits a video message according to a communication network to which the called terminal is connected.

Specific details of other embodiments are included in the detailed description and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only the embodiments are to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a video message service providing system according to an embodiment of the present invention.

Referring to Figure 1, the video message service providing system according to an embodiment of the present invention, the terminal (100, 190), the originating base station 110, the originating base station controller 120, the calling side exchange 130, the originating Home location register 150, video message server 140, multi-message server 165, destination home location register 170, gateway exchange 175, destination side exchange 180, destination side base station controller 182, and The destination base station 184 may be included.

The originating terminal 100 is a user device for transmitting a video message by opening a video call path with the video message server 140. The calling terminal 100 unilaterally transmits the video message to the video message server 140 through the video call path. Here, the originating terminal 100 may communicate with the originating base station 110 according to the third generation communication method, the third generation communication method includes a WCDMA communication method. On the other hand, the destination terminal 190 is a user device receiving a video message from the video message server 140. The destination terminal 190 is a dual mode terminal that can be connected to not only the third generation communication network but also the second generation communication network, and the second generation communication network may include a CDMA network or a global system for mobile telecommunication (GSM) network. In addition, the called terminal 190 may be connected to a next-generation communication network that can open a video call path and transmit a video message, and may include a multi-mode terminal that can be connected to a lower-generation communication network that cannot be established through a video call. .

The terminals 100 and 190 may include personal digital assistants (PDAs), computers, and the like capable of mobile communication as well as user devices used for mobile communication. The terminals 100 and 190 may be fixed or mobile, and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), and a wireless device.

The sender may input a function code to the calling terminal 100 as an indication to transmit a video message. Here, the function code refers to a code for requesting a video message service. For example, to request a video message service, '*' may be used as a function code before or after an incoming telephone number.

Alternatively, the caller may select a menu indicating video message transmission from a menu displayed on the calling terminal 100. The calling terminal 100 transmits an outgoing call requesting a video message service to a wireless section. The outgoing call may include a function code for the video message service, the called party's phone number, etc.

The base stations 110 and 184 may be divided into a calling base station 110 connected to the calling terminal 100 and a called base station 190 connected to the called terminal 190. The base stations 110 and 184 set up a wireless physical channel necessary for data exchange with the terminals 100 and 190 according to the control information transmitted from the base station controllers 120 and 182, and transmit the data transferred from the upper layer protocol to the wireless environment. To the terminal (100, 190).

The base stations 110 and 184 support various radio access technologies, such as channel coding, interleaving, modulation and demodulation, for data transmission in a radio section. The base station 110, 184 generally refers to a fixed station that communicates with the terminals 100, 190, and is a node-B, a base transceiver system (BTS), or an access point. Etc. may be called.

The base station controllers 120 and 182 control the base station and dynamically allocate radio resources of the mobile communication system. The base station controller 120 performs functions such as matching between base stations, inter-cell handover processing, call control, and the like, and serves as an access point for services provided through a core network. The base station controllers 120 and 184 may be divided into a calling base station controller 120 controlling the calling base station 110 and a called base station controller 182 controlling the called base station 184.

The exchanges 130 and 180 are responsible for call processing and relay functions for the mobile subscriber. The exchanges 130 and 180 transmit signals received or transmitted from the base stations 110 and 184, and provide exchange functions between mobile communication subscribers and mobile network subscribers and fixed network subscribers such as PSTN and ISDN. The exchanges 130 and 180 may be called an originating exchange 130 when performing a relay function for an outgoing call, and may be called a called side exchange 180 when performing a relay function for an incoming call.

The gateway exchange 175 plays a role of requesting a call connection to the called side exchange 180 which is close to the called terminal among the plurality of called side exchanges. The gateway switch 175 checks the location of the called terminal 190 in the called home location register 170 when there is a call connection request from the calling terminal 100 or the video message server 140, and the called terminal 190 A call connection request is made to the called side exchange 180 adjacent to the call.

The home location registers 150 and 170 provide subscriber information and current terminal location information. When the home location registers 150 and 170 provide the location information of the calling terminal 100 to the calling side exchange 130, they are called the calling home location register 150 and the location of the called terminal 190 at the gateway exchange 175. Providing the information may be referred to as the destination home location register 170. When the originating home location register 150 receives the location information of the calling terminal 100 for the video message service from the calling exchange 130, a routing number for establishing a call to the video message server 140 is provided. To the calling side exchange 130.

The video message server 140 receives a video message from the calling terminal 100 after opening a video call path with the calling terminal 100. The video message server 140 records the video message transmitted from the calling terminal 100 in real time. The video message server 140 may store the recorded video message, the sender's information, and the receiver's information.

The video message server 140 transmits the recorded video message to the called terminal 190. When the terminating terminal 190 is connected to the third generation communication network, the video message server 140 establishes a video call path with the terminating terminal 190, and sends a video message through the video call path with the terminating terminal 190. Send it. The video message is transmitted to the called terminal 190 and reproduced at the same time. This is because the multimedia data stream, called a video message, is transmitted in real time through the video call path, so that the transmitted terminal plays the multimedia data stream.

When the terminating terminal 190 is in the roaming state with the terminating terminal 190 as the second generation communication network, the video message server 140 may not establish a video call path with the terminating terminal 190. Since the video message service is performed through the video call path, the destination terminal 190 must be connected to the third generation communication network, but when the destination terminal 190 is not connected to the third generation communication network and roams to the second generation communication network, There is a need to send a video message by a method other than a video call.

In this case, the video message server 140 may transmit the video message through the multimedia message server 165. The video message server 140 uploads the recorded video message to the multimedia message server 165 while requesting the multimedia message server 165 to transmit the video message, and the multimedia message server 165 sends the video to the called terminal 190. The message can be converted into a multimedia message file for transmission.

The multimedia message server 165 serves to provide a multimedia messaging service. When the multimedia message server 165 receives a request to transmit a multimedia message from the video message server 140, the multimedia message server 165 may transmit the video message received from the video message server 140 to the called terminal 190.

Looking at the operation of the video message service providing system according to an embodiment of the present invention.

The caller sends a call requesting a video message service to the calling terminal 100. The originated call is forwarded to the originating exchange 130 through the originating base station 110. The calling exchange 130 acquires information such as the caller's location by the calling home location register 150 and transmits a call connection message to the video message server 140 by a routing number.

The video message server 140 transmits a response signal to the call exchange message to the calling side exchange 130 so that a video call path is established between the calling terminal 100 and the video message server 140. When the video call path is established, the video message server 140 records a video message to be transmitted from the calling terminal 100 to the called terminal 190.

When the video message is recorded in the video message server 140, the video message server 140 transmits the recorded video message to the called terminal 190. When the called terminal 190 is connected to a third generation communication network capable of receiving a video call service, the video message server 140 establishes a video call path by connecting a call to the called terminal 190. . The recorded video message is transmitted through the established video call path to be played back to the called terminal 190.

On the other hand, when the called terminal 190 is roaming into the second generation communication network, the video message server 140 transmits the video message to the called terminal 190 of the called party through the multimedia message server 165. The video message server 140 provides the multimedia message server 165 with the recorded video message while requesting the multimedia messaging service from the multimedia message server 165. The multimedia message server 165 converts the received video message to match the multimedia messaging file format and transmits it to the called terminal 190.

As described above, the video message service providing system according to an embodiment of the present invention records the video message to the video message server 140, and then transmits the video message differently according to a communication network to which the called terminal 190 is connected. can do. When the called terminal 190 is connected to the third generation communication network, the video message server 140 opens a video call path through the outbound call to the called terminal 190 and transmits the video message, and the called terminal 190 When roaming in the second generation communication network, the video message converted into a multimedia messaging file may be transmitted through the multimedia message server 165.

Thus, even when the called terminal roams on the second generation communication network and cannot receive the video message service, the video message can be transmitted.

In the video message service providing system according to an embodiment of the present invention, the third generation network and the second generation communication network have been described. However, this is only one example, and a next generation communication network such as a fourth generation, which will be serviced in the next generation, and a video call path are established. It can be applied to a system where non-existent lower generation communication networks coexist.

2 is a flowchart for recording a video message in a video message service providing method according to an embodiment of the present invention.

2, the calling terminal 100 transmits a call requesting a video message service (S210). For example, the caller may select a menu on the calling terminal 100 requesting a video message service or transmit a called number with a function code to the calling exchange 130.

The originating exchange 130 queries the originating location information of the originating terminal 100 to the originating home location register (HLR) 150. The caller location information may include location information of the caller terminal 100, cell information where the caller terminal 100 is located, and consequent information such as a communication network to which the caller terminal is connected. The originating home location register 150 transmits the originating location information of the corresponding originating terminal 100 to the originating exchange (S214). The originating home location register 150 may allocate a routing number to a call requesting a video message service and transmit the routing number to the calling side exchange 130 together with the called number.

The originating exchange 130 transmits an initial address message (IAM) to the video message server 140 using the routing number (S220). The video message server 140 transmits a call response signal (ACM) to the originating exchange 130 in response to the call connection message (S230). When the call response signal of the video message server is received, a video call path is formed between the calling terminal and the video message server (S240).

When the video call path is formed, the caller transmits the video message including the video and audio taken by the camera of the calling terminal 100 to the video message server 140 in real time. The video message server 140 records the video message transmitted from the calling terminal 100 in real time (S242). The video message server 140 may transmit the announcement regarding the video message recording to the calling terminal 100.

The video message server 140 performs video message recording, and may store the called party's telephone number and the transmission reservation time for receiving the video message. The video message server 140 may receive the announcement for specifying the reservation time and the reservation time information from the calling terminal in order to specify the transmission reservation time.

The video message server 140 ends the call with the calling terminal 100 when the video message recording is completed (S244).

When the video message is recorded in the video message server 140, the video message server 140 transmits the video message to the called terminal 190 immediately or at a designated reservation time. However, the method of transmitting the video message may vary according to the communication network to which the called terminal 190 is connected. In addition, when the terminating terminal 190 is connected to the second generation communication network, a video call path cannot be established, and in such a case, a method of transmitting a video message to the terminating terminal 190 is required. A method of transmitting the video message to the called terminal will be described later.

3 is a flowchart illustrating a method of providing a video message service according to a network to which a called terminal is connected in the method of providing a video message service according to an embodiment of the present invention.

Referring to FIG. 3, a method of providing a video message service varies depending on which communication network the called terminal is connected to among a third generation communication network or a second generation communication network. When the video message server 140 requests a call to open a video call path to the called terminal, the gateway switch 175 queries the called home location register 170 for incoming call location information of the called terminal (S310).

The called home location register 170 searches the information of the called terminal 190 and determines whether the called terminal 190 is connected to the third generation communication network as well as the position information of the called terminal 190 (S320). Therefore, when the called terminal 190 is connected to the third generation communication network, the video message server 140 may open a video call path with the called terminal 190. In operation S330, a video message is provided to the called terminal 190 by opening a video call path.

On the other hand, if the called home location register 170 cannot find the location information of the called terminal, it can be seen that the called terminal 190 is roaming into the second generation communication network. This is because, in principle, the destination home location register 170 searches for destination location information on the destination terminal 190 connected to the 3G communication network because it uses a video call path to transmit a video message to the destination terminal 190. Since the called terminal has already roamed into the second generation communication network, the called home location register 170 cannot find the location information of the called terminal. However, the case where the terminating terminal 190 is currently in a power-off state or the terminating terminal follows only the second generation communication method will be excluded.

Alternatively, the database of the incoming home location register 170 may include the terminal information connected to the second generation communication network as well as the terminal information connected to the third generation communication network. Thus, in this case, the called home location register 170 can obtain the called location information of the called terminal 190, but it can be seen that the called terminal is roamed into the second generation communication network.

As such, when the terminating terminal 190 is roamed into the second generation communication network, since the video call server 140 and the terminating terminal 190 cannot be opened as a video call, the opening of the video terminal to the video message server 140 is impossible. Notify that (S340).

Accordingly, the video message server 140 converts the video message recorded as the multimedia message file through the multimedia message server 165 without opening the video call path and transmits the video message to the called terminal 190 (S350). The called terminal 190 may allow the called party to watch the recorded video message by playing the transmitted multimedia message file.

As described above, even when the called terminal 190 is roamed into the second generation communication network, the video message recorded in the video message server 140 may be transmitted to the called terminal 190.

4 is a flowchart illustrating providing a video message service to a called terminal roaming on a second generation communication network in a method for providing a video message service according to an embodiment of the present invention.

Referring to FIG. 4, in order to provide a video message service to the called terminal 190 from the video message server 140, the video message server immediately after recording the video message to the video message server 140 or when a designated reservation time arrives. 140 requests a call connection to the gateway exchange 175 (S410).

The gateway exchange 175 inquires the location information of the called terminal 190 to the called home location register 170 (S420). The called home location register 170 queries the called location information of the called terminal to establish a video call path to the called terminal 190. When the terminating terminal 190 is roamed into the second generation communication network, the video call path to the terminating terminal cannot be established, and thus, the terminating home location register 170 is roaming to the second generation communication network by the gateway exchange, thereby preventing the incoming processing. Notify (S425). The destination home location register 170 returns to the gateway switcher 175 the reason for the inability to process the call using the predetermined identifier so that the gateway switcher 175 is roaming from the 3rd generation communication network to the 2nd generation communication network. It can be seen that a video call is not possible.

The gateway switch 175 notified that the incoming call cannot be processed cannot establish a video call path with the called terminal 190 and terminates the call to the video message server. While ending the call, the call termination message (REL; Release) is transmitted to the video message server (S450). While transmitting the call termination message, the called terminal may inform the video message server that the called terminal roams from the third generation communication network to the second generation communication network through an identifier.

Therefore, since the video message cannot be transmitted through the video call path, the video message is transmitted through the multimedia message server 165. The video message server 140 requests a multimedia messaging service from the multimedia message server 165. The multimedia message server 165 receives a video message to be transmitted from the video message server. Along with this, information such as a called terminal and a time to transmit the video message is received.

The multimedia message server 165 may transmit the video message in the form of a multimedia message immediately after receiving the video message or at a scheduled time. In this case, the process may include converting the recorded video message into a multimedia message file format. The called terminal 190 receiving the video message in the multimedia message format may play the video message in the terminal to allow the called party to watch the sent video message.

As such, when the called terminal 190 is roamed into the second generation communication network, the video message cannot be transmitted through the video call path, but the sender's video message can be transmitted to the called party by transmitting the video message through the multimedia message server 165. .

In particular, even when the caller cannot establish a direct video call path to the called party, the caller can indirectly convey his or her intention to the called party, and can reduce unnecessary calls by delivering a video message without talking to the called party.

5 is a flowchart illustrating providing a video message service to a called terminal connected to a third generation communication network in a method of providing a video message service according to an embodiment of the present invention.

Referring to FIG. 5, in order to provide a video message service to the called terminal 190 in the video message server 140, the video message server 140 first requests a call connection to the gateway exchange 175 (S510).

The gateway exchange 175 inquires the location information of the called terminal 190 to the called home location register 170 (S520). The called home location register 170 provides the called terminal location information to the gateway exchange 175 to respond to the called location information so as to connect a call to the called side exchange 180 close to the called terminal 190 (S525). If the destination home location register 170 can notify the gateway switch 175 of the destination location information, the destination home location register 170 notifies the location information of the destination terminal 190 and informs that the destination terminal 190 is connected to the third generation communication network. will be. Therefore, the video message can be transmitted by establishing a video call path at the called terminal.

The gateway exchange 175 having obtained the called terminal location information transmits an initial address message (IAM) to the called side exchange 180 near the called terminal 190 (S530).

After receiving the call connection message, the destination exchange 180 may page the destination terminal 190 to notify that there is a call connection request from the video message server. The destination exchange 180 transmits a call response message (ACM) to the video message server 140 (S540).

When the called terminal 190 responds to the paging signal, the called side exchange 180 transmits a call response message to the video message server 140 to form a call path between the video message server 140 and the called terminal 190. (S550). The video message server 140 transmits the video message recorded by the caller to the called terminal 190 through the formed call path (S560). Since the called terminal 190 is connected to the third generation communication network, the called terminal 190 may receive the video message and simultaneously play it on the display of the called terminal 190 to allow the called party to watch the video message.

When the video message transmission is completed, the video message server 140 ends the call (S565).

As described above, when the called terminal 190 is connected to the third generation communication network, the recorded video message can be transmitted or transmitted from the video message server to the called terminal by simultaneously establishing a video call.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains have various permutations and modifications without departing from the spirit or essential features of the present invention. It is to be understood that the present invention may be practiced in other specific forms, since modifications may be made. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to an embodiment of the present invention as described above, even if the called terminal roams to another communication network can provide a video message service. In addition, by providing a video message service to the user it is possible to activate the use of the video call, and to increase the effect on the communication by delivering a multimedia message rather than a simple text message.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Claims (12)

(a) recording a video message to be sent to a called terminal on a video message server; (b) receiving and determining from the location register whether the called terminal is roamed to a CDMA communication network; And (c) when the called terminal is roamed into the CDMA network, the video message file recorded by the multimedia messaging service is transmitted to the called terminal, and when the called terminal is connected to the WCDMA network, And reproducing the recorded video message to the called terminal. delete The method of claim 1, wherein step (b) And receiving information on whether the called terminal is roaming into the CDMA network from the called home location register. The method of claim 1, wherein the called terminal is And a terminal operating in a dual mode to support the CDMA and WCDMA communication networks. delete The method of claim 1, wherein step (c) A video message service providing method performed at a scheduled time set by a caller. The method of claim 1, Receiving a call to send the video message from the originating terminal, further comprising a video message service providing method. (a) recording a video message to be sent to a called terminal on a video message server; (b) receiving information on a type of communication network to which the called terminal is connected from a location register; And (c) when the called terminal is connected to the second generation communication network according to the received information, the video message file recorded by the multimedia messaging service is transmitted to the called terminal, and the called terminal is connected to the third generation or more communication network. And if present, reproducing the video message recorded by the video call path to the called terminal. A video message server for recording a video message to be sent to a called terminal; And A home location register for determining whether the called terminal is connected to a WCDMA communication network or a CDMA communication network; When the called terminal is connected to the WCDMA communication network, the video message server opens a video call path to the called terminal to play the recorded video message. When the called terminal is connected to the CDMA communication network, the video message server plays a multimedia message server. And transmitting the recorded video message through the video message providing system. The method of claim 9, The video message server opens a video call path with the calling terminal to receive and record a video message from the calling terminal in real time. The method of claim 9, The home location register determines a communication network to which the called terminal is connected and informs the video message server whether it is possible to open a video call. delete

Images