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CN1878350A - Method for realizing color ring optimization - Google Patents

Method for realizing color ring optimization Download PDF

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Publication number
CN1878350A
CN1878350A CNA2006100984453A CN200610098445A CN1878350A CN 1878350 A CN1878350 A CN 1878350A CN A2006100984453 A CNA2006100984453 A CN A2006100984453A CN 200610098445 A CN200610098445 A CN 200610098445A CN 1878350 A CN1878350 A CN 1878350A
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called
msc
flow process
caller
trigger
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CNA2006100984453A
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CN100387076C (en
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丁岩
张晓鹏
吴晓明
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention relates to a method for optimizing color ring, which comprises: a, calling MSC sends route request to SRI; b, called HLR, according to SRI message, obtains the trigger ability of calling MSC and called MSC; c, judging if the calling or called MSC supports trigger process, and executing relative trigger process. In said invention, the color ring service can be completed without routing to the color ring service interface junction, even there is only one in the target area, and the control of trigger is realized at HLR, to improve the flexibility and expanding property.

Description

A kind of method that realizes color ring optimization
Technical field
The present invention relates to communication technique field, relate in particular to a kind of method of the realization color ring optimization based on priority.
Background technology
Ring Back Tone service is a business by customization.The user can set up Customized Ring Back Tone on their own after opening Ring Back Tone service, as one section melodious music or a greeting, when it was called out, music or recording for the calling subscriber plays customization replaced common ring-back tone.
Traditional voice CRBT and video telephone are combined, the multimedia color ring back tone of video and audio frequency just can be provided to the calling subscriber, thereby, improve user experience, promote the image and the income of operator with this for the user provides individual business more.
The scheme of traditional voice CRBT has intelligent network scheme and switch scheme, and the switch scheme can be divided into caller switch scheme and called switch scheme again.The multimedia color ring back tone scheme can go to realize according to same scheme.
Existing online voice CRBT scheme can be divided into caller switch scheme and called switch scheme.Respectively as shown in Figure 1 and Figure 2, wherein Fig. 1 is caller switch scheme networking structure figure, and Fig. 2 is called switch scheme networking structure figure, and heavy line is represented speech channel among the figure; Fine line is represented ISUP (ISDN UserPart)/TUP (Telephone User Part) signaling link; The actual situation line is represented MAP (Mobile ApplicationPart)/BSSAP (Base Station System Application Part) signaling link.Wherein, the target protocol zone has referred to adopt the zone of this programme, and non-target protocol zone refers to not adopt the zone of this programme.Among Fig. 1,, need in the target protocol zone one or more gateway mobile switches (GMSC) are transformed into off deck gateway mobile switch (CR-GMSC) in order to support the media ring function of calling subscriber when non-target protocol is regional.Equally, among Fig. 2,, need in the target protocol zone one or more gateway mobile switches (GMSC) are transformed into Ring Back Tone service gateway exchange (CR-GMSC) in order to support the media ring function of called subscriber when non-target protocol is regional.
The shortcoming of the CRBT of existing switch mode is: for caller switch scheme, have only caller just can not have circuitous (without CR-GMSC) in the target protocol district, promptly the caller switch only considers that when judging whether to adopt round about manner whether the calling subscriber is in the target protocol district; Equally, for called switch scheme, have only called in the target protocol district, just can not have circuitous (without CR-GMSC), be that called switch scheme only considers that when judging whether to adopt round about manner whether the called subscriber is in the target protocol district, make caller or called scheme have meaningless making a circulation, increase the network investment of operator.
Summary of the invention
The purpose of this invention is to provide a kind of method that realizes color ring optimization,, call out route and just needn't make a circulation, finish Ring Back Tone service as long as make calling and called have one in the target protocol district.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions.
A kind of method that realizes color ring optimization comprises step: a: caller MSC sends out request route information SRI; B: called HLR obtains the triggering ability of caller MSC and called MS C according to SRI information; C: judge whether caller MSC or called MS C support to trigger flow process, carry out relative trigger process according to judged result.
Wherein, if judge that obtaining caller MSC supports to trigger flow process, called MS C does not support to trigger flow process, then carries out caller at Originating Office and triggers flow process among the step c.
Wherein, if judge that obtaining called MS C supports to trigger flow process, caller MSC does not support to trigger flow process, then carries out called triggering flow process at called office among the step c.
Wherein, if judgement obtains caller MSC and called MS C supports to trigger flow process,, then carry out caller and trigger flow process among the step c at Originating Office if further the priority of the caller MSC that presets is greater than the priority of called MS C; If the priority of the called MS C that presets greater than the priority of caller MSC, is then carried out called triggering flow process at called office.
Wherein, among the step c,, then carry out gateway exchange and trigger flow process if judgement obtains caller MSC and called MS C does not support to trigger flow process.
Wherein, described execution gateway exchange comprises also before triggering flow process that one of inquiry supports gateway exchange to trigger the MSC of flow process in the MSC tabulation.
Wherein, step b specifically comprises: according to SRI information, obtain caller MSC address; Inquiring calling MSC triggers ability from the MSC tabulation; According to the called number in the SRI information, obtain called MS C address; Inquiry called MS C triggers ability from the MSC tabulation.
Wherein, described CRBT is voice CRBT or multimedia color ring back tone.
Above technical scheme as can be seen, the present invention has following beneficial effect:
1, proposed comprehensively a kind of and CRBT scheme flexibly, promptly, finished Ring Back Tone service, reduced that to call out route circuitous in conjunction with priority according to the corresponding ability combination of mobile switching centre (MSC) in the target protocol district.
As long as 2, calling and called have one in the target protocol district, just need not be routed to CR-GMSC and finish Ring Back Tone service, and the HLR that is controlled at that triggers realizes that feasible realization is flexible more, autgmentability is strong.
3, since reduced meaningless circuitous, so also reduced transformation to GMSC in the scheme district, thereby reduced the risk capital of operator.
Description of drawings
Fig. 1 is caller switch scheme networking structure figure;
Fig. 2 is called switch scheme networking structure figure;
Fig. 3 is the switch scheme networking structure figure based on priority;
Fig. 4 is the flow chart of calling subscriber in the target protocol zone;
Fig. 5 is the flow chart of calling subscriber in non-target protocol zone;
Fig. 6 is the flow chart of called subscriber in the target protocol zone;
Fig. 7 is the switch scheme flow chart based on priority.
Embodiment
Core of the present invention is: in calling procedure, HLR triggers ability according to the CRBT of calling mobile exchanging center (O_MSC) and called mobile switching centre (T_MSC), determines that this time Ring Back Tone service still is that T_MSC triggers by O_MSC.One of them supports CRBT to trigger ability if having only O_MSC or T_MSC, and then HLR selects this MSC to trigger; If O_MSC and T_MSC both support then HLR determines by O_MSC still to be that T_MSC triggers according to O_MSC that presets and T_MSC priority principle; If neither support, then HLR selects pre-configured GMSC to route the call to CR-GMSC and finishes the CRBT triggering.
For ease of the present invention is further understood, now describe the present invention in conjunction with the accompanying drawings.
As shown in Figure 3 based on the switch scheme networking structure figure of priority, the routed path under the various different call case, fine line is represented BICC (Bearer Independent Call Control)/ISUP (ISDN UserPart) signaling link; The actual situation line is represented MAP (Mobile Application Part)/BSSAP (Base StationSystem Application Part) signaling link; The multimedia carrying is represented with thick line; As can be seen from Figure, when caller in the target protocol district, called not in the target protocol district; Or caller in the target protocol district, called in the target protocol district; Or caller is called in the target protocol district not in the target protocol district, during these three kinds of situations, just need not be routed to CR-GMSC, produces circuitous when therefore also just avoiding calling out; When active and standby when crying, must be routed to CR-GMSC this moment and finish CRBT and set out not in the target protocol district.
Caller herein not only refers to the Home Network mobile subscriber, also comprises his network users; When for his network users, caller refers in the target protocol district call out the exchange of access in the target protocol district.
In the present invention, need generate a tabulation that is illustrated in all MSC triggering abilities in the target protocol district in HLR: for the arbitrary MSC in the target protocol district, it can be the combination of following one or more abilities: caller triggers ability, called triggering ability, gateway exchange triggering ability.
Following table is an example, and MSC1 has caller triggering ability in the example; The existing caller of MSC2 triggers ability, and called triggering ability is also arranged; MSC3 has gateway exchange to trigger ability.
Caller triggers ability Called triggering ability Gateway exchange triggers ability
MSC1 Be Not Not
MSC2 Be Be Not
MSC3 Not Not Be
Table 1
In the calling procedure, for Ring Back Tone service trigger be O_MSC preferentially or T_MSC preferential, be operator's option, operator sets selected by HLR configuration relevant parameter, in case selected, then in whole target protocol, determine.Therefore, in calling procedure, there are two kinds of priority situations:
1、O_MSC＞T_MSC＞CR-GMSC：
At this moment, HLR judges according to parameter in the MSC table whether O_MSC and T_MSC have the triggering ability, triggers ability when O_MSC has CRBT, and T_MSC does not trigger ability; Or O_MSC has CRBT to trigger ability, T_MSC also has the triggering ability, HLR can select to trigger CRBT by O_MSC according to the priority principle, just need not be routed to CR-GMSC during calling, also just avoid producing circuitous, this moment, CRBT triggered flow process referring to the flow chart of calling subscriber shown in Figure 4 in the target protocol zone, and idiographic flow is as follows:
Flow process 1:
Step 401: caller MSC receives calling subscriber's SETUP message; Perhaps GMSC receives initial address message (IAM) signaling of outer net Incoming;
Step 402～step 406: caller MSC sends SRI to called HLR, the inquiry routing iinformation; HLR sends out PRN to the called MS C at the current place of called subscriber, seeks mobile roaming number (MSRN); Called MS C distributes MSRN, returns PRN_ACK to HLR; HLR sends out SRI acknowledgement message (SRI_ACK) to caller MSC, wherein has MSRN and Ring Back Tone service sign indicating number (SS_Code); Caller MSC puts the CRBT sign according to the Ring Back Tone service sign indicating number with this calling, and utilizes MSRN to initiate IAM to callee side;
Step 407: called MS C receives called subscriber's page response (representing the called free time), sends call setup message;
Step 408～step 409: after the called subscriber successfully connected, the terminal ring was returned ALERTING message simultaneously and is given called MS C; Called MS C returns ring signaling address master's message (ACM) to Calling Side, and wherein User Status is idle; Called MS C begins to play common ring-back tone simultaneously;
Step 410～step 411: caller MSC sends Alerting message to the caller mobile subscriber, and perhaps the outside network switch of GMSC sends ACM; After caller MSC/GMSC received the ACM that callee side returns, according to CRBT call sign, temporary transient inaccessiblely is connected with the speech channel of callee side, the while, called number was service code+called ISDN to color ring platform transmission IAM message;
Step 412～step 413: color ring platform draws required bell sound according to the calling and called Subscriber Number, and to caller MSC/GMSC loopback ACM message; Color ring platform is to caller MSC/GMSC loopback ANM and begin to play the bell sound; At this moment play the bell sound that the calling subscriber begins to hear called custom-made;
Step 414～step 418: the called subscriber answers calling, and terminal sends Connect message to called MS C; Called MS C sends ANM to Calling Side and replys signaling; Caller MSC sends Connect message to the calling subscriber; Perhaps GMSC transmits ANM to outer net; Simultaneously, caller MSC/GMSC falls CRBT speech channel obturation, then is opened to the speech channel connection of called MS C, makes calling and called user normal dialog, and both sides can't hear the CRBT sound; Caller MSC/GMSC sends the signaling REL that takes out stitches to color ring platform, and the disconnection cause value is for normally taking out stitches; Color ring platform is to caller MSC/GMSC loopback REL COM signaling, and expression is taken out stitches and finished.
When having CRBT, O_MSC do not trigger ability, T_MSC has the triggering ability, HLR can select to trigger CRBT by T_MSC, need not be routed to CR-GMSC during calling, also just avoid producing circuitous, this moment, CRBT triggered flow process referring to the flow chart of called subscriber shown in Figure 6 in the target protocol zone, and idiographic flow is as follows:
Flow process 3:
Step 601～step 602: caller MSC receives calling subscriber's SETUP message; Perhaps GMSC receives the IAM signaling of outer net Incoming; Caller MSC sends out SRI to called HLR, the inquiry routing iinformation;
Step 603:HLR judges called current in the target protocol zone, sends out PRN to the called MS C at the current place of called subscriber, seeks MSRN;
Step 604～step 605: called MS C distributes MSRN, returns PRN_ACK to HLR; HLR sends out SRI_ACK to caller MSC, wherein has MSRN (not having Ring Back Tone service sign SS-CODE);
Step 606～step 609: caller MSC/GMSC initiates IAM to callee side, and called number is MSRN; After called MS C receives IAM, is that CRBT is called out according to the CRBT sign SS-CODE in the called party data (being inserted among the VLR by HLR when user data inserts operation) with this call identification, and after receiving called subscriber's page response (representing the called free time), send call setup message; After the called subscriber successfully connects, the terminal ring, called MS C receives Alerting message, returns ALERTING message and gives called MS C; Called MS C returns ring signaling ACM to Calling Side, and wherein User Status is idle; Called MS C begins to play common ring-back tone simultaneously;
Step 610～step 613: caller MSC sends Alerting message to the caller mobile subscriber, and perhaps the outside network switch of GMSC sends ACM; After called MS C receives Alerting message, according to CRBT call sign, stop the broadcast of common ring-back tone, send IAM message to color ring platform simultaneously, called number is service code+called ISDN; Color ring platform draws required bell sound according to the calling and called Subscriber Number, and to called MS C loopback ACM message; Color ring platform is to called MS C loopback ANM and begin to play the bell sound; At this moment play the bell sound that the calling subscriber begins to hear called custom-made;
Step 614～step 618: the called subscriber answers calling, and terminal sends Connect message to called MS C; Called MS C sends ANM to Calling Side and replys signaling; Caller MSC sends Connect message to the calling subscriber; Perhaps GMSC transmits ANM to outer net; Simultaneously, caller MSC/GMSC falls CRBT speech channel obturation, then is opened to the speech channel connection of called MS C, makes calling and called user normal dialog, and both sides can't hear the CRBT sound; Called MS C sends the signaling REL that takes out stitches to color ring platform, and the disconnection cause value is for normally taking out stitches; Color ring platform is to called MS C loopback REL COM signaling, and expression is taken out stitches and finished.
When having CRBT, O_MSC do not trigger ability, T_MSC does not trigger ability yet, and HLR can select to trigger CRBT by the GMSC that presets, and calls out to be routed to CR-GMSC, this moment, CRBT triggered flow process referring to the flow chart of calling subscriber shown in Figure 5 in non-target protocol zone, and idiographic flow is as follows:
Flow process 2:
Step 501～step 502: caller MSC receives calling subscriber's SETUP message; Caller MSC sends out SRI to called HLR, the inquiry routing iinformation;
Step 503～step 505:HLR judges that this caller MSC belongs to non-target protocol zone, initiates the PRN operation to CR-GMSC; CR-GMSC returns SRI_ACK, and the value of filling in is the interim virtual roaming number MSRN value of distributing of called subscriber for CR-GMSC in the MSRN territory wherein, and CR-GMSC preserves the corresponding relation of this MSRN and called actual MSISDN simultaneously; HLR returns SRI_ACK to caller MSC, the virtual roaming number MSRN value that the value of filling in is returned for CR-GMSC in the MSRN territory wherein (not wounded bell service identification SS-CODE);
Step 506～step 509: caller MSC is that called number makes a call to CR-GMSC with MSRN; CR-GMSC initiates the SRI operation to HLR, and wherein the MSISDN territory value of filling in is for inquiring about the resulting real called party Mobile Subscriber International ISDN Number of corresponding relation according to the called number (being virtual roaming number MSRN) of going in the office signaling; HLR finds corresponding real called party Mobile Subscriber International ISDN Number according to MSRN, and sends PRN message with this to called MS C; Called MS C returns true roaming number;
Step 510～step 514:HLR sends out SRI_ACK to CR-GMSC, wherein has true MSRN and Ring Back Tone service sign indicating number SS_Code; CR-GMSC puts the CRBT sign according to the Ring Back Tone service sign indicating number with this calling, and utilizes MSRN to initiate IAM to callee side; Called MS C receives called subscriber's page response (representing the called free time), sends call setup message; After the called subscriber successfully connected, the terminal ring was returned ALERTING message simultaneously and is given called MS C; Called MS C returns ring signaling ACM to Calling Side, and wherein User Status is idle; Called MS C begins to play common ring-back tone simultaneously;
Step 515～step 519:CR-GMSC transmits ACM to caller MSC; Caller MSC sends Alerting message to the calling subscriber; CR-GMSC is according to CRBT call sign, and temporary transient obturation is connected with the speech channel of callee side, sends IAM message to color ring platform simultaneously, and called number is service code+called ISDN; Color ring platform draws required bell sound according to the calling and called Subscriber Number, and to CR-GMSC loopback ACM message; Color ring platform is to CR-GMSC loopback ANM and begin to play the bell sound;
Step 520～step 525: the called subscriber answers calling, and terminal sends Connect message to called MS C; Called MS C sends ANM to Calling Side and replys signaling; CR-GMSC transmits ANM to caller MSC; Caller MSC sends Connect message to the calling subscriber; CR-GMSC after called MS C sends Connect message, sends the REL signaling of taking out stitches to color ring platform in terminal immediately; Color ring platform is to CR-GMSC loopback REL COM signaling, and expression is taken out stitches and finished.
Among the present invention, HLR is that caller triggers concrete control that flow process, called triggering flow process or gateway exchange trigger flow process as shown in Figure 7 in decision:
Step 701: caller MSC sends out request route information (SRI) to called HLR;
Step 702:, obtain caller MSC according to SRI message;
Step 703:HLR inquiring calling MSC from the MSC tabulation triggers ability;
Step 704～step 705: according to the called number in the SRI message, obtain called MS C, and inquiry called MS C triggers ability from the MSC tabulation;
Step 706: judge whether caller MSC supports caller to trigger flow process, if then enter step 707; Otherwise, enter step 708;
Step 707: judge whether called MS C supports called triggering flow process, if then enter step 709; Otherwise, enter step 710;
Step 708: judge whether called MS C supports called triggering flow process, if then enter step 714; Otherwise, enter step 713;
Step 709: it is preferential to judge whether that caller triggers, if then carry out caller at Originating Office and trigger flow process idiographic flow such as flow process 1; Otherwise, enter step 712;
Step 710: carry out caller at Originating Office and trigger flow process, idiographic flow such as flow process 1;
Step 712: carry out called triggering flow process at called office, idiographic flow such as flow process 3;
Step 713: one of inquiry supports gateway exchange to trigger the MSC of flow process in the MSC tabulation;
Step 714: carry out called triggering flow process idiographic flow such as flow process 3 at called office;
Step 715: carry out gateway exchange and trigger flow process, idiographic flow such as flow process 2.
Therefore, can draw from above-mentioned calling procedure, under priority O_MSC＞T_MSC＞CR-GMSC situation, O_MSC that HLR relates to according to calling and the triggering ability of T_MSC determine which triggers Ring Back Tone service by, and be specifically as shown in table 2:
The O_MSC CRBT triggers ability The T_MSC CRBT triggers ability The MSC that HLR selects Select flow process Whether circuitous
Have Have O_MSC Flow process 1 Not
Have Do not have O_MSC Flow process 1 Not
Do not have Have T_MSC Flow process 3 Not
Do not have Do not have CR-GMSC Flow process 2 Be
Table 2
2、T_MSC＞O_MSC＞CR-GMSC
At this moment, HLR judges according to parameter in the MSC table whether O_MSC and T_MSC have the triggering ability, triggers ability when T_MSC has CRBT, and O_MSC does not trigger ability; Or T_MSC has CRBT to trigger ability, and O_MSC also has the triggering ability, and HLR can select to trigger CRBT by T_MSC according to the priority principle, just need not be routed to CR-GMSC during calling, also just avoids producing and makes a circulation, and this moment, CRBT triggered flow process with above-mentioned flow process 3.
Trigger ability when T_MSC has CRBT, O_MSC has the triggering ability, and HLR can select to trigger CRBT by O_MSC, need not be routed to CR-GMSC during calling, also just avoids producing and makes a circulation, and this moment, CRBT triggered flow process with above-mentioned flow process 1.
Do not trigger ability when T_MSC has CRBT, O_MSC does not trigger ability yet, and HLR can select to trigger CRBT by the GMSC that presets, and calls out to be routed to CR-GMSC, and this moment, CRBT triggered flow process with above-mentioned flow process 2.
Therefore, can draw from above-mentioned calling procedure, under priority T_MSC＞O_MSC＞CR-GMSC situation, O_MSC that HLR relates to according to calling and the triggering ability of T_MSC determine which triggers Ring Back Tone service by, and be specifically as shown in table 3:
The O_MSC CRBT triggers ability The T_MSC CRBT triggers ability The MSC that HLR selects Select flow process Whether circuitous
Have Have T_MSC Flow process 3 Not
Have Do not have O_MSC Flow process 1 Not
Do not have Have T_MSC Flow process 3 Not
Do not have Do not have CR-GMSC Flow process 2 Be
Table 3
In sum, the present invention is the optimization to step in the prior art, in the call process, HLR triggers ability according to the CRBT of O_MSC and T_MSC, determine that this time Ring Back Tone service still is that T_MSC triggers by O_MSC, if having only O_MSC and one of them support of T_MSC, then HLR selects this MSC; If O_MSC and T_MSC support then which triggering HLR defines according to the priority principle; If neither support, then HLR selects pre-configured GMSC to be routed to CR-GMSC to trigger.
More than a kind of method of color ring optimization that realizes provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (8)

1, a kind of method that realizes color ring optimization is characterized in that, comprises step:
A: caller MSC sends out request route information SRI;
B: called HLR obtains the triggering ability of caller MSC and called MS C according to SRI information;
C: judge whether caller MSC or called MS C support to trigger flow process, carry out relative trigger process according to judged result.
2, realize the method for color ring optimization according to claim 1, it is characterized in that if judge that obtaining caller MSC supports to trigger flow process, called MS C does not support to trigger flow process, then carries out caller at Originating Office and triggers flow process among the step c.
3, realize the method for color ring optimization according to claim 1, it is characterized in that if judge that obtaining called MS C supports to trigger flow process, caller MSC does not support to trigger flow process, then carries out called triggering flow process at called office among the step c.
4, realize the method for color ring optimization according to claim 1, it is characterized in that, if judgement obtains caller MSC and called MS C supports to trigger flow process,, then carry out caller and trigger flow process among the step c at Originating Office if further the priority of the caller MSC that presets is greater than the priority of called MS C; If the priority of the called MS C that presets greater than the priority of caller MSC, is then carried out called triggering flow process at called office.
5, realize the method for color ring optimization according to claim 1, it is characterized in that, among the step c,, then carry out gateway exchange and trigger flow process if judgement obtains caller MSC and called MS C does not support to trigger flow process.
As the method for realization color ring optimization as described in the claim 5, it is characterized in that 6, described execution gateway exchange comprises also before triggering flow process that one of inquiry supports gateway exchange to trigger the MSC of flow process in the MSC tabulation.
7, realize the method for color ring optimization according to claim 1, it is characterized in that step b specifically comprises:, obtain caller MSC address according to SRI information; Inquiring calling MSC triggers ability from the MSC tabulation; According to the called number in the SRI information, obtain called MS C address; Inquiry called MS C triggers ability from the MSC tabulation.
8, as the method for claim 1 to 7 realization color ring optimization as described in each, it is characterized in that described CRBT is voice CRBT or multimedia color ring back tone.
CNB2006100984453A 2006-07-07 2006-07-07 Method for realizing color ring optimization Expired - Fee Related CN100387076C (en)

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CN102131160A (en) * 2011-03-18 2011-07-20 中兴通讯股份有限公司 Method and system for avoiding false playback in failure of coloring ring back tone (CRBT) interconnection of gateway exchange

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CN101583107B (en) * 2008-05-13 2011-07-06 中国移动通信集团公司 Method, equipment and system for processing international roaming call of color ring user
CN102131160A (en) * 2011-03-18 2011-07-20 中兴通讯股份有限公司 Method and system for avoiding false playback in failure of coloring ring back tone (CRBT) interconnection of gateway exchange
WO2012126305A1 (en) * 2011-03-18 2012-09-27 中兴通讯股份有限公司 Implementation method and system for preventing error playing of coloring ring back tone due to connection failure of gateway exchange

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