CN1980283B - Wide-band, narrow-band network integrated multi-media ring realizing method and system using MS for playing sound - Google Patents
Wide-band, narrow-band network integrated multi-media ring realizing method and system using MS for playing sound Download PDFInfo
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- CN1980283B CN1980283B CN2005101263096A CN200510126309A CN1980283B CN 1980283 B CN1980283 B CN 1980283B CN 2005101263096 A CN2005101263096 A CN 2005101263096A CN 200510126309 A CN200510126309 A CN 200510126309A CN 1980283 B CN1980283 B CN 1980283B
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Abstract
The method includes steps: callings for both color ring user in broadband and color ring user in narrowband are sent to soft exchanger; soft exchanger analyzes attribute or number sect of color ring user; based on analyzed result, sending message to application server of broadband network service in order to trigger service logic in application server; service logic indicates soft exchanger to continue the call to color ring user as called terminal, and indicates media server to connect the calling terminal to play back color ring, which through IP network is transferred to the calling terminal. The invention does not need to modify existed protocols or add new protocol for broadband network, or increase investment on color ring in narrowband network by operation manager. The method keeps consistency of coloring services between narrowband and broadband.
Description
Technical field
The present invention relates to telephonic communication, particularly relate to a kind of CRBT implementation method and system that uses the wide and narrow strip network unification of media server playback.
Background technology
Ring Back Tone service (personalized ring back tone service) has obtained well carrying out in China and even East Asia telecommunication market because its individualized feature significantly, obviously strengthens auditory perception.At networks such as narrowband network such as GSM (global system for mobile communications), CDMA (code division multiple access), PHS (Personal Handyphone System), landline telephones, there has been ripe business machine that Ring Back Tone service is provided at present.In broadband network (based on the network of IP-Internet Protocol), people have also proposed the demand demand of wide-band color bell (promptly to) to CRBT naturally.Some on a large scale investment construction the operator of broadband network, wish that the cost with minimum is that the wide and narrow strip network user provides Ring Back Tone service simultaneously.The voice signal of broadband network transmits, the control signaling is different fully with narrowband network, use broadband network equipment to provide Ring Back Tone service if solved as narrowband network, then not only can satisfy wide and narrow strip Ring Back Tone service demand as early as possible, also lay the foundation for carrying out other multimedia service in the future.
Summary of the invention
Technical problem to be solved by this invention provides a kind of CRBT implementation method and system that uses the wide and narrow strip network unification of media server playback, solves prior art can not well realize media server playback CRBT in the network of wide and narrow strip unification technical problem.
For achieving the above object, the invention provides a kind of CRBT implementation method of using the wide and narrow strip network unification of media server playback, its characteristics are, comprise: will all send to SoftSwitch to the wide-band color bell user with to narrowband polyphonic ringtone user's calling, described SoftSwitch is to the attribute of described color ring user or number segment is analyzed and send message to trigger the service logic on the described broadband network service application service device according to analysis result to broadband network service application service device; Described service logic indicates described SoftSwitch to continue as the color ring user of terminal called, and indication media server connection calling terminal and coloring ring back tone playing sound, and described CRBT sound is sent to calling terminal through IP network.
Above-mentioned method, its characteristics are, send in the calling to the narrowband polyphonic ringtone user under the condition of SoftSwitch, further comprise the steps:
Step 1 will send to described SoftSwitch to narrowband polyphonic ringtone user's calling;
Step 2, described SoftSwitch is analyzed described narrowband polyphonic ringtone user's user property or number segment, and sends triggering message according to analysis result to described broadband network service application service device;
Step 3, the service logic on the described broadband network service application service device is triggered, and described service logic indicates described SoftSwitch to continue as the described narrowband polyphonic ringtone user of terminal called;
Step 4, the described SoftSwitch described terminal called that continues finally is delivered to the narrow band switching machine to signaling by described SoftSwitch by SGW;
Step 5, described dialed terminal bell, described narrow band switching machine is reported to described broadband network service application service device with called terminal ringing message through described SGW and described SoftSwitch;
Step 6, described service logic connects to described media server, and indicates described media server to connect calling terminal and coloring ring back tone playing sound, and described CRBT sound is sent to calling terminal through IP network, thus described CRBT sound is heard in caller;
Step 7, described narrow band switching machine reports the terminal called off-hook to reply or call out the message of failing to connect, and described message is reported to described broadband network service application service device via described SGW and described SoftSwitch;
Step 8, described broadband network service application service device indicate described media server to be disconnected to the connection of calling terminal, finish the coloring ring back tone playing sound; If the terminal called off-hook is replied, then described broadband network service application service device indicates described SoftSwitch to be updated to the media stream formats of calling terminal, makes caller and incoming call; Fail to connect if call out, described service logic finishes, and described SoftSwitch discharges related resource.
Above-mentioned method, its characteristics are, send in the calling to the wide-band color bell user under the condition of SoftSwitch, further comprise the steps:
Step a, when the calling to described wide-band color bell user arrived, described SoftSwitch was analyzed described wide-band color bell user's user property or number segment, and sent message according to analysis result to described broadband network service application service device;
Step b, the service logic on the described broadband network service application service device is triggered, and indicates described SoftSwitch to continue as the described wide-band color bell user of terminal called;
Step c, the described SoftSwitch described terminal called that continues;
Steps d, described dialed terminal bell, described SoftSwitch report called terminal ringing message to described broadband network service application service device;
Step e, described service logic connects to described media server, indicates described media server to connect caller and coloring ring back tone playing sound, and described CRBT sound is sent to calling terminal through described IP network, thus the CRBT sound is heard in caller;
Step f reports called off-hook to reply or call out by described SoftSwitch to described broadband network service application service device and fails to connect message;
Step g, described broadband network service application service device indicate described media server to be disconnected to the connection of calling terminal, finish the coloring ring back tone playing sound; If the terminal called off-hook is replied, then described broadband network service application service device indicates described SoftSwitch to be updated to the media stream formats of caller, makes caller and incoming call; Fail to connect if call out, described service logic finishes, and described SoftSwitch discharges related resource.
Above-mentioned method, its characteristics are, in the following ways one of them realizes described step 1: mode one, and when described calling to the narrowband polyphonic ringtone user arrived, described narrow band switching machine was routed to Tandem Gateway and SGW to speech channel according to user property; Mode two, to any local subscriber's calling, described narrow band switching machine all is routed to Tandem Gateway and SGW to speech channel; Mode three, by the calling elder generation arrival Tandem Gateway and the SGW of caller network, SGW sends message to described SoftSwitch then, thus described SoftSwitch is transferred in exchange control; Mode four arrives described SoftSwitch by the message related to calls of caller network, thereby described SoftSwitch is directly transferred in exchange control.
Above-mentioned method, its characteristics are that in described step 6, described CRBT sound is a media stream formats, and described CRBT sound is sent to described calling terminal by described IP network through media gateway.
Above-mentioned method, its characteristics are that in described step 6, described media server is connected calling terminal by described Tandem Gateway with SGW.
Above-mentioned method, its characteristics are that in described step e, described CRBT sound is a media stream formats, and described CRBT sound is sent to described calling terminal by described IP network through media gateway.
In order better to realize purpose of the present invention, the present invention also provides a kind of CRBT of the wide and narrow strip network unification of media server playback that uses to realize system, its characteristics are, comprising: SoftSwitch, broadband network service application service device, media server and IP network; Described SoftSwitch connects described broadband network service application service device and described IP network, be used to receive to the wide-band color bell user with to narrowband polyphonic ringtone user's calling, and to the attribute of described color ring user or number segment is analyzed and send message according to analysis result to described broadband network service application service device; Described broadband network service application service device connects described media server, described broadband network service application service device also has business logic modules, be used to indicate described SoftSwitch switching called terminal, and indicate described media server to connect calling terminal and coloring ring back tone playing sound; Described IP network connects described media server, is used for described CRBT sound is sent to calling terminal.
Above-mentioned system, its characteristics are, also comprise narrow band switching machine, Tandem Gateway and SGW, and described narrow band switching machine is connected described SoftSwitch and described IP network by described Tandem Gateway with SGW.
Above-mentioned system, its characteristics are that described broadband network service application service device is the application server with gateway function of supporting the Parlay standard.
Technique effect of the present invention is:
The present invention is can realize being that the wide and narrow strip network provides Ring Back Tone service simultaneously once the cover color ring systems.The present invention has made full use of broadband network and SS, MS equipment, does not require that broadband network revises existing protocol or increase New Deal; When providing media ring function, do not need operator, also kept the consistency of Ring Back Tone service in addition arrowband, broadband user for the narrowband network CRBT increases investment to the wide and narrow strip user.
Description of drawings
Fig. 1 is a grid schematic diagram of the present invention;
Fig. 2 is the bell sound speech channel schematic diagram of the present invention when providing CRBT to broadband network;
Fig. 3 is the bell sound speech channel schematic diagram of a kind of situation of the present invention when providing CRBT to narrowband network;
Fig. 4 is the signaling process schematic diagram of a kind of situation of the present invention when providing CRBT to broadband network.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Fig. 1 is a grid schematic diagram of the present invention, as shown in the figure, system of the present invention is by compositions such as broadband network service application service device APP 101 (Application Server refers to comprise the service application service device of Parlay Gateway function here), SoftSwitch (SS) 102, media server (MS) 103, Tandem Gateway and SGW (TG/SG) 104 and IP network 105, narrow band circuit switch 106, narrowband networks.
In the system of the present invention, be used to transmit Ring Back Tone service being connected between APP and the SS and trigger message, the indication called message etc. that continues.Being connected between APP and the MS is used to indicate coloring ring back tone playing sound message.Be connected as media gateway by TG/SG between the called switch in arrowband (or dialed field switch) and the called SS (or dialed field SS), be connected to signalling system No.7 and speech channel relaying between called switch in arrowband (or dialed field switch) and the TG/SG, being connected between TG/SG and the called SS (or dialed field SS) then is the IP broadband network, and an important function of this link is carried the CRBT sound exactly.Called SS (or dialed field SS), TG/SG, MS then are connected in the IP broadband network.
Among the present invention, on APP equipment, loaded a broadband services software, by this business software controls playing CRBT sound.
Among the present invention, the called switch in arrowband (or dialed field switch) has following function: when the calling to color ring user (or any local subscriber) arrives, can be routed to TG/SG to speech channel, finish exchange control by SS afterwards, final when speech channel takes back the called switch in arrowband (or dialed field switch), connect terminal called.
Among the present invention, ownership, the user of tandem on called SS (or dialed field SS) if opened media ring function, then have relevant record in the user data on SS, and when the incoming call that takes place this user, trigger business software on the APP by SS; Perhaps, SS is according to the business software on the Subscriber Number section triggering APP.
Among the present invention, the color ring systems of being made up of APP, MS can provide the method for Ring Back Tone service as follows to narrowband network simultaneously for narrowband network, broadband network provide Ring Back Tone service:
1) when the calling to color ring user arrived, the narrow band switching machine was routed to TG/SG to speech channel according to user property; Perhaps to any local subscriber's calling, the narrow band switching machine all is routed to TG/SG to speech channel; Perhaps, by the arrival TG/SG of calling elder generation of caller network, SG sends message to SS then, and SS is transferred in exchange control; Perhaps, by the message related to calls arrival SS of caller network, SS is directly transferred in exchange control.
2) SS sends message according to the analysis to user property or number segment to APP.
3) the business software logic on the APP is triggered, indication SS switching called terminal.
4) SS switching called terminal, this process are by SG signaling finally to be delivered to the narrow band switching machine by SS.
5) dialed terminal bell reports called terminal ringing message to SS by the narrow band switching machine via SG, and SS reports called terminal ringing message to APP.
6) the business software logic on the APP connects to MS, and instruct MS connects caller (by media gateway TG/SG), instruct MS coloring ring back tone playing sound (media stream formats), the CRBT sound arrives media gateway, is sent to calling terminal (or be sent to calling terminal through IP network) through media gateway through IP network.After this step was finished, the CRBT sound was heard in caller.
7) called off-hook is replied or is called out and fails to connect, by the narrow band switching machine via the SG reporting message to SS, the SS reporting message is to APP.
8) the APP instruct MS is disconnected to the connection of caller, finishes the coloring ring back tone playing sound; If called party answer, then APP indication SS is updated to the media stream formats of caller, caller incoming call; Fail to connect if call out, the business software logic on the APP finishes, and SS discharges related resource.
Provide the method for Ring Back Tone service as follows to broadband network:
1) when the calling to the CRBT broadband user arrived, SS sent message according to user property or number segment to APP.
2) the business software logic on the APP is triggered, indication SS switching called terminal.
3) SS switching called terminal.
4) dialed terminal bell, SS report called terminal ringing message to APP.
5) the business software logic on the APP connects to MS, and instruct MS connects caller, coloring ring back tone playing sound (media stream formats), and the CRBT sound is sent to calling terminal through IP network (or again through media gateway).After this step was finished, the CRBT sound was heard in caller.
6) called off-hook is replied or is called out and fails to connect, and the SS reporting message is to APP.
7) the APP instruct MS is disconnected to the connection of caller, finishes the coloring ring back tone playing sound; If called party answer, then APP indication SS is updated to the media stream formats of caller, caller incoming call; Fail to connect if call out, the business software logic on the APP finishes, and SS discharges related resource.
Introduce the relevant flow process of wide and narrow strip CRBT of the present invention below respectively.
As Fig. 2, be that the CRBT sound path schematic diagram of color ring systems when being broadband network coloring ring back tone playing sound: MS plays storage CRBT sound thereon according to the indication that APP goes up service logic, the CRBT sound is transmitted through the such path of MS 103 → IP network 105 → caller (centre has media gateway device), this wherein, MS is between the IP network being the IP Media Stream.
As Fig. 3, be the CRBT sound path schematic diagram of color ring systems when being narrowband network coloring ring back tone playing sound, this situation is: caller also is the narrowband network user, or the calling route is to arrive first called (ownership) switch to arrive TG+SG again, MS plays storage CRBT sound thereon according to the indication that APP goes up service logic, the CRBT sound is transmitted through the such path of the narrowband network → caller of MS 103 → TG+SG 104 → called ownership, this wherein, being the IP Media Stream between MS → TG+SG, is the circuit speech channel of narrowband network between the narrowband network of TG+SG → called ownership.
As Fig. 4, signaling process when below being illustrated as the wide and narrow strip network Ring Back Tone service being provided:
By networking of the present invention, no matter be to broadband user's calling or to the calling of narrow-band user, the control signaling all can arrive called SS (or dialed field SS) earlier, trigger Ring Back Tone service on the APP by SS, the CRBT sound then all is to be play by MS, directly through IP network or be sent to caller through TG again.Therefore main signaling process is from SS.
SS control is transferred in the calling of narrow-band user, following mode can be arranged: when the calling to color ring user arrived, the narrow band switching machine was routed to TG/SG to speech channel according to user property; Perhaps to any local subscriber's calling, the narrow band switching machine all is routed to TG/SG to speech channel; Perhaps, by the arrival TG/SG of calling elder generation of caller network, SG sends message to SS then, and SS is transferred in exchange control; Perhaps, by the message related to calls arrival SS of caller network, SS is directly transferred in exchange control.
1. the calling to the broadband called subscriber arrives broadband network, and SS receives SIP signaling INVITE, to Calling Side responds SIP signaling 100 message.
2.SS send INVITE to APP according to UAD or number segment configuration.
3.SS APP is with 100 message in response, and it is called to continue.
4.SS receive the SIP signaling called terminal ringing message 180 that called (or called gateway device) returns, report this 180 message to APP, and in 180 message, require APP response PRACK with the parameter indication.
5.APP responds SIP signaling PRACK message, SS response 200.
6.APP send MGCP signaling CRCX message to MS, instruct MS connects, APP is with 200 message in the MS response.
7.APP send MGCP signaling RQNT message to MS, instruct MS coloring ring back tone playing sound; With media stream formats coloring ring back tone playing sound, the CRBT sound is heard in caller to MS by IP network.
8.. after called off-hook was replied, SS sent 200 message to APP.
9.APP to SS response ACK message, and to MS transmission DLCX message, instruct MS disconnects and connecting, MS responds 200 message to APP.
10.APP send UPDATE message to caller, SDP partly fills in the media capability of called support in the message, caller response 200 message.
11.APP again to called transmission INVITE, fill in SDP part in the message, thereby finish caller, the media negotiation between called with the media capability of caller support.
12. transmit voice message with the Media Stream of consulting to confirm between caller is called, the calling and called conversation.
In sum, by the present invention above-mentioned device and operational approach, can realize being that the wide and narrow strip network provides Ring Back Tone service simultaneously once the cover color ring systems.The present invention has made full use of broadband network and SS, MS equipment, does not require that broadband network revises existing protocol or increase New Deal; When providing media ring function, do not need operator, also kept the consistency of Ring Back Tone service in addition arrowband, broadband user for the narrowband network CRBT increases investment to the wide and narrow strip user.
The foregoing description, narrowband network situation are applicable to PHS, GSM, CDMA, PSTN network and other all circuit-switched networks, and broadband network is suitable for IP network such as NGN switch network, IMS network etc.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.
Claims (7)
1. the CRBT implementation method of a wide and narrow strip network unification of using the media server playback, it is characterized in that, comprise: will all send to SoftSwitch to the wide-band color bell user with to narrowband polyphonic ringtone user's calling, described SoftSwitch is to the attribute of described color ring user or number segment is analyzed and send message to trigger the service logic on the described broadband network service application service device according to analysis result to broadband network service application service device; Described service logic indicates described SoftSwitch to continue as the color ring user of terminal called, and indication media server connection calling terminal and coloring ring back tone playing sound, and described CRBT sound is sent to calling terminal through IP network;
Wherein, send in calling under the condition of SoftSwitch, further comprise the steps: the narrowband polyphonic ringtone user
Step 1 will send to described SoftSwitch to narrowband polyphonic ringtone user's calling;
Step 2, described SoftSwitch is analyzed described narrowband polyphonic ringtone user's user property or number segment, and sends triggering message according to analysis result to described broadband network service application service device;
Step 3, the service logic on the described broadband network service application service device is triggered, and described service logic indicates described SoftSwitch to continue as the described narrowband polyphonic ringtone user of terminal called;
Step 4, the described SoftSwitch described terminal called that continues finally is delivered to the narrow band switching machine to signaling by described SoftSwitch by SGW;
Step 5, described dialed terminal bell, described narrow band switching machine is reported to described broadband network service application service device with called terminal ringing message through described SGW and described SoftSwitch;
Step 6, described service logic connects to described media server, and indicates described media server to connect calling terminal and coloring ring back tone playing sound, and described CRBT sound is sent to calling terminal through IP network, thus described CRBT sound is heard in caller;
Step 7, described narrow band switching machine reports the terminal called off-hook to reply or call out the message of failing to connect, and described message is reported to described broadband network service application service device via described SGW and described SoftSwitch;
Step 8, described broadband network service application service device indicate described media server to be disconnected to the connection of calling terminal, finish the coloring ring back tone playing sound; If the terminal called off-hook is replied, then described broadband network service application service device indicates described SoftSwitch to be updated to the media stream formats of calling terminal, makes caller and incoming call; Fail to connect if call out, described service logic finishes, and described SoftSwitch discharges related resource;
Send in calling under the condition of SoftSwitch, further comprise the steps: the wide-band color bell user
Step a, when the calling to described wide-band color bell user arrived, described SoftSwitch was analyzed described wide-band color bell user's user property or number segment, and sent message according to analysis result to described broadband network service application service device;
Step b, the service logic on the described broadband network service application service device is triggered, and indicates described SoftSwitch to continue as the described wide-band color bell user of terminal called;
Step c, the described SoftSwitch described terminal called that continues;
Steps d, described dialed terminal bell, described SoftSwitch report called terminal ringing message to described broadband network service application service device;
Step e, described service logic connects to described media server, indicates described media server to connect caller and coloring ring back tone playing sound, and described CRBT sound is sent to calling terminal through described IP network, thus the CRBT sound is heard in caller;
Step f reports called off-hook to reply or call out by described SoftSwitch to described broadband network service application service device and fails to connect message;
Step g, described broadband network service application service device indicate described media server to be disconnected to the connection of calling terminal, finish the coloring ring back tone playing sound; If the terminal called off-hook is replied, then described broadband network service application service device indicates described SoftSwitch to be updated to the media stream formats of caller, makes caller and incoming call; Fail to connect if call out, described service logic finishes, and described SoftSwitch discharges related resource.
2. method according to claim 1, it is characterized in that, in the following ways one of them realizes described step 1: mode one, and when described calling to the narrowband polyphonic ringtone user arrived, described narrow band switching machine was routed to Tandem Gateway and SGW to speech channel according to user property; Mode two, to any local subscriber's calling, described narrow band switching machine all is routed to Tandem Gateway and SGW to speech channel; Mode three, by the calling elder generation arrival Tandem Gateway and the SGW of caller network, SGW sends message to described SoftSwitch then, thus described SoftSwitch is transferred in exchange control; Mode four arrives described SoftSwitch by the message related to calls of caller network, thereby described SoftSwitch is directly transferred in exchange control.
3. method according to claim 2 is characterized in that, in described step 6, described CRBT sound is a media stream formats, and described CRBT sound is sent to described calling terminal by described IP network through media gateway.
4. method according to claim 2 is characterized in that, in described step 6, described media server is connected calling terminal by described Tandem Gateway with SGW.
5. method according to claim 1 is characterized in that, in described step e, described CRBT sound is a media stream formats, and described CRBT sound is sent to described calling terminal by described IP network through media gateway.
6. one kind is used the CRBT of the wide and narrow strip network unification of media server playback to realize system, it is characterized in that, comprising: SoftSwitch, broadband network service application service device, media server and IP network;
Described SoftSwitch connects described broadband network service application service device and described IP network, be used to receive to the wide-band color bell user with to narrowband polyphonic ringtone user's calling, and to the attribute of described color ring user or number segment is analyzed and send message according to analysis result to described broadband network service application service device;
Described broadband network service application service device connects described media server, described broadband network service application service device also has business logic modules, be used to indicate described SoftSwitch switching called terminal, and indicate described media server to connect calling terminal and coloring ring back tone playing sound;
Described IP network connects described media server, is used for described CRBT sound is sent to calling terminal;
Described system also comprises narrow band switching machine, Tandem Gateway and SGW, and described narrow band switching machine is connected described SoftSwitch and described IP network by described Tandem Gateway with SGW.
7. system according to claim 6 is characterized in that, described broadband network service application service device is the application server with gateway function of supporting the Parlay standard.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005101263096A CN1980283B (en) | 2005-12-05 | 2005-12-05 | Wide-band, narrow-band network integrated multi-media ring realizing method and system using MS for playing sound |
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| CN2005101263096A CN1980283B (en) | 2005-12-05 | 2005-12-05 | Wide-band, narrow-band network integrated multi-media ring realizing method and system using MS for playing sound |
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| CN1980283A CN1980283A (en) | 2007-06-13 |
| CN1980283B true CN1980283B (en) | 2011-04-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101217706B (en) * | 2008-01-17 | 2012-12-19 | 中兴通讯股份有限公司 | A method and system for realizing color ring back tone in soft exchange |
| CN102025844A (en) * | 2010-12-06 | 2011-04-20 | 中兴通讯股份有限公司 | Color bell business implementation method and device |
| CN102752723B (en) * | 2011-04-19 | 2015-06-24 | 中兴通讯股份有限公司 | Method and system for carrying out playback of narrowband service by utilizing wideband |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1507290A (en) * | 2002-12-09 | 2004-06-23 | 北京凯华网络技术有限公司 | Telephone cell back ring sound replacing method and system for intelligent mobile telephone network |
| CN1556645A (en) * | 2004-01-02 | 2004-12-22 | 中兴通讯股份有限公司 | System and method for providing individuality ring back tone business in yonger generation network |
| KR20050082802A (en) * | 2004-02-20 | 2005-08-24 | 주식회사데이콤 | The ringback tone service method using voip application server |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1507290A (en) * | 2002-12-09 | 2004-06-23 | 北京凯华网络技术有限公司 | Telephone cell back ring sound replacing method and system for intelligent mobile telephone network |
| CN1556645A (en) * | 2004-01-02 | 2004-12-22 | 中兴通讯股份有限公司 | System and method for providing individuality ring back tone business in yonger generation network |
| KR20050082802A (en) * | 2004-02-20 | 2005-08-24 | 주식회사데이콤 | The ringback tone service method using voip application server |
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