CN104753904A - Voice calling method and device and SIP (session initiation protocol) gateway equipment - Google Patents
Voice calling method and device and SIP (session initiation protocol) gateway equipment Download PDFInfo
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Abstract
The invention discloses a voice calling method and device and SIP gateway equipment. The method comprises converting a called number carried in a first voice calling request from a PBX (private branch exchange) server, and then transmitting the converted number to an IMS (Internet protocol multimedia subsystem) service platform registered by a called IMS terminal to instruct the IMS service platform to call the called IMS terminal, and/or converting a called number carried in a second voice calling request from the IMS service platform, and transmitting the converted number to a PBX server which a called PBX terminal belongs to to instruct the PBX server to call the called PBX terminal. The voice calling method and device can achieve voice calling between the IMS terminal and the PBX terminal.
Description
Technical field
The present invention relates to communication technical field, espespecially a kind of voice call method, device session initiation protocol (Session Initiation Protocol, SIP) gateway device.
Background technology
Internet protocol multi-media sub-system (Internet Protocol Multimedia Subsystem, IMS) is the business that current each mobile operator promotes mainly, and is also the basis of diversification business model.But still generally use the terminal based on dedicated packet switched (Private Branch Exchange, PBX) system in present each enterprise, between current IMS terminal and PBX terminal, can not audio call be realized.
In order to promote the use of IMS, original PBX system can only be abolished, reinstalling IMS, but just causing enterprise's input in earlier stage like this wastes completely, this just causes IMS to promote on a large scale.Therefore, the audio call realized between IMS terminal and PBX terminal is extremely important.
Summary of the invention
The embodiment of the present invention provides a kind of voice call method, device and SIP gateway device, in order to realize the audio call between IMS terminal and PBX terminal.
Therefore, the embodiment of the present invention provides a kind of voice call method, comprising:
After changing from the called number carried in the first voice call request of dedicated packet switched PBX server, send to the IMS business platform that called internet protocol multi-media sub-system IMS terminal is registered, indicate described IMS business platform to call out described called IMS terminal, described first voice call request is that caller PBX terminal sends during called IMS terminal to described in described PBX server request audio call; And/or
After the called number carried in the second voice call request from described IMS business platform is changed, send to the PBX server of called PBX terminal attaching, indicate called PBX terminal described in described PBX server call, described second voice call request is that caller IMS terminal sends during called PBX terminal to described in described IMS business platform request audio call.
Concrete, change from the called number carried in the first voice call request of PBX server, specifically comprise:
Obtain the called number carried in described first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that described called number is corresponding;
If find, described called number is converted to the IMS number found.
Optionally, also comprise:
If search less than, then return miscue information to described PBX server.
Concrete, the called number carried in the second voice call request from described IMS business platform is changed, specifically comprises:
Obtain the called number carried in described second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that described called number is corresponding;
If find, described called number is converted to the PBX number found.
Optionally, also comprise:
If search less than, then return miscue information to described IMS business platform.
A kind of voice calling device is also provided, comprise the first audio call unit and/or the second audio call unit, described first audio call unit comprises the first transmitting-receiving subelement and the first process subelement, described second audio call unit comprises the second transmitting-receiving subelement and the second process subelement, wherein:
Described first transmitting-receiving subelement, for receiving the first voice call request from dedicated packet switched PBX server; And, by the IMS business platform that the first voice call request after described first process subelement conversion sends to called internet protocol multi-media sub-system IMS terminal to register, indicate described IMS business platform to call out described called IMS terminal, described first voice call request is that caller PBX terminal sends during called IMS terminal to described in described PBX server request audio call;
Described first process subelement, for changing the called number carried in described first voice call request;
Described second transmitting-receiving subelement, for receiving the second voice call request from described IMS business platform; And, the second voice call request after described second process subelement conversion is sent to the PBX server of called PBX terminal attaching, indicate called PBX terminal described in described PBX server call, described second voice call request is that caller IMS terminal sends during called PBX terminal to described in described IMS business platform request audio call;
Described second process subelement, for changing the called number carried in described second voice call request.
Concrete, described first process subelement, specifically for:
Obtain the called number carried in described first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that described called number is corresponding;
If find, described called number is converted to the IMS number found.
Optionally, described first process subelement, also for:
If search less than, then return miscue information to described PBX server.
Concrete, described second process subelement, specifically for:
Obtain the called number carried in described second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that described called number is corresponding;
If find, described called number is converted to the PBX number found.
Optionally, described second process subelement, also for:
If search less than, then return miscue information to described IMS business platform.
A kind of SIP gateway device is also provided, comprise the first audio call unit and/or the second audio call unit, described first audio call unit comprises first transceiver and first processor, and described second audio call unit comprises second transceiver and the second processor, wherein:
Described first transceiver, for receiving the first voice call request from dedicated packet switched PBX server; And, by the IMS business platform that the first voice call request after described first processor conversion sends to called internet protocol multi-media sub-system IMS terminal to register, indicate described IMS business platform to call out described called IMS terminal, described first voice call request is that caller PBX terminal sends during called IMS terminal to described in described PBX server request audio call;
Described first processor, for changing the called number carried in described first voice call request;
Described second transceiver, for receiving the second voice call request from described IMS business platform; And, the second voice call request after described second processor conversion is sent to the PBX server of called PBX terminal attaching, indicate called PBX terminal described in described PBX server call, described second voice call request is that caller IMS terminal sends during called PBX terminal to described in described IMS business platform request audio call;
Described second processor, for changing the called number carried in described second voice call request.
Concrete, described first processor, specifically for:
Obtain the called number carried in described first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that described called number is corresponding;
If find, described called number is converted to the IMS number found.
Optionally, described first processor, also for:
If search less than, then return miscue information to described PBX server.
Concrete, described second processor, specifically for:
Obtain the called number carried in described second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that described called number is corresponding;
If find, described called number is converted to the PBX number found.
Optionally, described second processor, also for:
If search less than, then return miscue information to described IMS business platform.
The voice call method that the embodiment of the present invention provides, device and SIP gateway device, by changing from the called number carried in the first voice call request of PBX server, can realize caller PBX terminal voice call called IMS terminal; By changing from the called number carried in the second voice call request of IMS business platform, the called PBX terminal of caller IMS terminal audio call can be realized.Thus the audio call achieved between IMS terminal and PBX terminal.
Accompanying drawing explanation
Fig. 1 is the flow chart of the voice call method of caller PBX terminal call called IMS terminal in the embodiment of the present invention;
Fig. 2 is the flow chart that in the embodiment of the present invention, caller IMS terminal calls out the voice call method of called PBX terminal;
Fig. 3 is the structural representation of the first voice calling device in the embodiment of the present invention;
Fig. 4 is the structural representation of the second voice calling device in the embodiment of the present invention;
Fig. 5 is the structural representation of the third voice calling device in the embodiment of the present invention;
Fig. 6 is the structural representation of the first SIP gateway device in the embodiment of the present invention;
Fig. 7 is the structural representation of the second SIP gateway device in the embodiment of the present invention;
Fig. 8 is the structural representation of the third SIP gateway device in the embodiment of the present invention;
Fig. 9 is the flow chart of the voice call method in the embodiment of the present invention one;
Figure 10 is the flow chart of the voice call method in the embodiment of the present invention two.
Embodiment
In order to realize the audio call between IMS terminal and PBX terminal, the embodiment of the present invention provides a kind of voice call method, and the executive agent of the method is SIP gateway device.
When caller PBX terminal voice call called IMS terminal, flow process as shown in Figure 1, performs step as follows:
S10: receive the first voice call request from PBX server, the first voice call request is that caller PBX terminal sends to during PBX server request audio call called IMS terminal.
When caller PBX terminal voice call called IMS terminal, the PBX server to caller PBX terminal attaching sends the first voice call request, and then this first voice call request is transmitted to SIP gateway device by PBX server.
S11: after the called number carried in the first voice call request is changed, the IMS business platform sending to called IMS terminal to register, instruction IMS business platform calling called IMS terminal.
After the form that the IMS business platform that the called number carried in first voice call request is changed into called IMS terminal registration by SIP gateway device can identify, the IMS business platform sending to called IMS terminal to register, thus instruction IMS business platform calling called IMS terminal.
When the called PBX terminal of caller IMS terminal audio call, flow process as shown in Figure 2, performs step as follows:
S20: receive the second voice call request from IMS business platform, sends when the second voice call request is caller IMS terminal PBX terminal called to IMS business platform request audio call.
When the called PBX terminal of caller IMS terminal audio call, the IMS business platform to the registration of caller IMS terminal sends the second voice call request, and then this first voice call request is transmitted to SIP gateway device by IMS business platform.
S21: after being changed by the called number carried in the second voice call request, sends to the PBX server of called PBX terminal attaching, the called PBX terminal of instruction PBX server call.
After the form that the PBX server that the called number carried in second voice call request is changed into called PBX terminal attaching by SIP gateway device can identify, send to the PBX server of called PBX terminal attaching, thus the called PBX terminal of instruction PBX server call.
In the program, by changing from the called number carried in the first voice call request of PBX server, caller PBX terminal voice call called IMS terminal can be realized; By changing from the called number carried in the second voice call request of IMS business platform, the called PBX terminal of caller IMS terminal audio call can be realized.Thus the audio call achieved between IMS terminal and PBX terminal.
Concrete, changing from the called number carried in the first voice call request of PBX server in above-mentioned S11, specifically comprises:
Obtain the called number carried in the first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that called number is corresponding;
If find, called number is converted to the IMS number found;
If search less than, then return miscue information to PBX server.
During caller PBX terminal voice call called IMS terminal, called number is the PBX virtual-number of called IMS terminal, SIP gateway device can be preserved the corresponding relation of PBX virtual-number and IMS number in advance, then just can search the IMS number of called IMS terminal according to the PBX virtual-number of called IMS terminal, called number be converted to the IMS number found; If search less than, then return miscue information to PBX server.
SIP gateway device can be each IMS number in the application of PBX server to PBX virtual-number, then preserve the corresponding relation of PBX virtual-number and IMS number.
Concrete, changing from the called number carried in the second voice call request of IMS business platform in above-mentioned S21, specifically comprises:
Obtain the called number carried in the second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that called number is corresponding;
If find, called number is converted to the PBX number found;
If search less than, then return miscue information to IMS business platform.
During the called PBX terminal of caller IMS terminal audio call, called number is the IMS virtual-number of called PBX terminal, SIP gateway device can be preserved the corresponding relation of IMS virtual-number and PBX number in advance, then just can search the PBX number of called PBX terminal according to the IMS virtual-number of called PBX terminal, called number be converted to the PBX number found; If search less than, then return miscue information to IMS business platform.
SIP gateway device can be registered at IMS business platform for each PBX number, obtains an IMS virtual-number, then preserves the corresponding relation of IMS virtual-number and PBX number.
Based on same inventive concept, the embodiment of the present invention provides a kind of voice calling device, the structure of this device can have three kinds, the first as shown in Figure 3, comprise the first audio call unit 30, the second comprises the second audio call unit 40 as shown in Figure 4, and the third comprises the first audio call unit 30 and the second audio call unit 40 as shown in Figure 5.First audio call unit 30 comprises the first transmitting-receiving subelement 300 and the first process subelement 301, second audio call unit 40 comprises the second transmitting-receiving subelement 400 and the second process subelement 401, wherein:
First transmitting-receiving subelement 300, for receiving the first voice call request from PBX server; And, the IMS business platform that the first voice call request after being changed by first process subelement 301 sends to called IMS terminal to register, instruction IMS business platform calling called IMS terminal, the first voice call request is that caller PBX terminal sends to during PBX server request audio call called IMS terminal.
First process subelement 301, for changing the called number carried in the first voice call request.
Second transmitting-receiving subelement 400, for receiving the second voice call request from IMS business platform; And, the second voice call request after being changed by second process subelement 401 sends to the PBX server of called PBX terminal attaching, instruction PBX server call called PBX terminal, sends when the second voice call request is caller IMS terminal PBX terminal called to IMS business platform request audio call.
Second process subelement 401, for changing the called number carried in the second voice call request.
Concrete, the first process subelement 301, specifically for:
Obtain the called number carried in the first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that called number is corresponding;
If find, called number is converted to the IMS number found.
Optionally, first process subelement 301, also for:
If search less than, then return miscue information to PBX server.
Concrete, the second process subelement 401, specifically for:
Obtain the called number carried in the second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that called number is corresponding;
If find, called number is converted to the PBX number found.
Optionally, second process subelement 401, also for:
If search less than, then return miscue information to IMS business platform.
Based on same inventive concept, the embodiment of the present invention provides a kind of SIP gateway device, the structure of this SIP gateway device can have three kinds, the first as shown in Figure 6, comprise the first audio call unit 60, the second as shown in Figure 7, comprises the second audio call unit 70, the third comprises the first audio call unit 60 and the second audio call unit 40 as shown in Figure 8.First audio call unit 60 comprises first transceiver 600 and first processor 601, second audio call unit 70 comprises second transceiver 700 and the second processor 701, wherein:
First transceiver 600, for receiving the first voice call request from PBX server; And, the IMS business platform that the first voice call request after being changed by first processor 601 sends to called IMS terminal to register, instruction IMS business platform calling called IMS terminal, the first voice call request is that caller PBX terminal sends to during PBX server request audio call called IMS terminal.
First processor 601, for changing the called number carried in the first voice call request.
Second transceiver 700, for receiving the second voice call request from IMS business platform; And, the second voice call request after being changed by second processor 701 sends to the PBX server of called PBX terminal attaching, instruction PBX server call called PBX terminal, sends when the second voice call request is caller IMS terminal PBX terminal called to IMS business platform request audio call.
Second processor 701, for changing the called number carried in the second voice call request.
Concrete, first processor 601, specifically for:
Obtain the called number carried in the first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that called number is corresponding;
If find, called number is converted to the IMS number found.
Optionally, first processor 601, also for:
If search less than, then return miscue information to PBX server.
Concrete, the second processor 701, specifically for:
Obtain the called number carried in the second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that called number is corresponding;
If find, called number is converted to the PBX number found.
Optionally, the second processor 701, also for:
If search less than, then return miscue information to IMS business platform.
With two specific embodiments, above-mentioned voice call method is described below.
Embodiment one
When caller PBX terminal voice call called IMS terminal, flow process as shown in Figure 9, performs step as follows:
S90: caller PBX terminal sends the first voice call request to the PBX server of caller PBX terminal attaching.
S91:PBX server judges signalling route according to the prefix of the called number carried in the first voice call request, if prefix is X, then direct audio call PBX terminal, if prefix is Y, is then transmitted to SIP gateway device by the first voice call request.
Wherein, prefix X, Y can be 0-9 combination in any, such as, suppose that the prefix of local PBX terminal is 8, and when prefix is 8, direct audio call PBX terminal, when prefix is not 8, is transmitted to SIP gateway device by the first voice call request.
After S92:SIP gateway receives the first voice call request of PBX server forwarding, the form that IMS business platform called number being converted to called IMS terminal registration can identify, if conversion occurs abnormal, then returns Defect Indication information; If change successfully, then the first voice call request after conversion is sent to IMS business platform.
After S93:IMS business platform receives the first voice call request after conversion, calling called IMS terminal.
S94: called IMS terminal response caller PBX terminal.
Embodiment two
When the called PBX terminal of caller IMS terminal audio call, flow process as shown in Figure 10, performs step as follows:
S100: the IMS business platform that caller IMS terminal is registered to caller IMS terminal sends the second voice call request.
S101:IMS business platform checks the state of called PBX terminal, if called PBX terminal is not registered, then calls out termination; If called PBX endpoint registration state is normal, then the second voice call request is sent to SIP gateway device.
Wherein, SIP gateway device is called PBX endpoint registration at IMS business platform.
S102:SIP gateway receives the second voice call request that IMS business platform sends, the called number carried in second voice call request is converted to the form that PBX server can identify, and the second voice call request after conversion is sent to PBX server.
The called PBX terminal of S103:PBX server call.
S104: called PBX terminal B replys caller IMS terminal.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe optional embodiment of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the embodiment of the present invention and not depart from the spirit and scope of the embodiment of the present invention.Like this, if these amendments of the embodiment of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (15)
1. a voice call method, is characterized in that, comprising:
After changing from the called number carried in the first voice call request of dedicated packet switched PBX server, send to the IMS business platform that called internet protocol multi-media sub-system IMS terminal is registered, indicate described IMS business platform to call out described called IMS terminal, described first voice call request is that caller PBX terminal sends during called IMS terminal to described in described PBX server request audio call; And/or
After the called number carried in the second voice call request from described IMS business platform is changed, send to the PBX server of called PBX terminal attaching, indicate called PBX terminal described in described PBX server call, described second voice call request is that caller IMS terminal sends during called PBX terminal to described in described IMS business platform request audio call.
2. the method for claim 1, is characterized in that, changes, specifically comprise from the called number carried in the first voice call request of PBX server:
Obtain the called number carried in described first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that described called number is corresponding;
If find, described called number is converted to the IMS number found.
3. method as claimed in claim 2, is characterized in that, also comprise:
If search less than, then return miscue information to described PBX server.
4. the method for claim 1, is characterized in that, is changed by the called number carried, specifically comprise in the second voice call request from described IMS business platform:
Obtain the called number carried in described second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that described called number is corresponding;
If find, described called number is converted to the PBX number found.
5. method as claimed in claim 4, is characterized in that, also comprise:
If search less than, then return miscue information to described IMS business platform.
6. a voice calling device, it is characterized in that, comprise the first audio call unit and/or the second audio call unit, described first audio call unit comprises the first transmitting-receiving subelement and the first process subelement, described second audio call unit comprises the second transmitting-receiving subelement and the second process subelement, wherein:
Described first transmitting-receiving subelement, for receiving the first voice call request from dedicated packet switched PBX server; And, by the IMS business platform that the first voice call request after described first process subelement conversion sends to called internet protocol multi-media sub-system IMS terminal to register, indicate described IMS business platform to call out described called IMS terminal, described first voice call request is that caller PBX terminal sends during called IMS terminal to described in described PBX server request audio call;
Described first process subelement, for changing the called number carried in described first voice call request;
Described second transmitting-receiving subelement, for receiving the second voice call request from described IMS business platform; And, the second voice call request after described second process subelement conversion is sent to the PBX server of called PBX terminal attaching, indicate called PBX terminal described in described PBX server call, described second voice call request is that caller IMS terminal sends during called PBX terminal to described in described IMS business platform request audio call;
Described second process subelement, for changing the called number carried in described second voice call request.
7. device as claimed in claim 6, is characterized in that, described first process subelement, specifically for:
Obtain the called number carried in described first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that described called number is corresponding;
If find, described called number is converted to the IMS number found.
8. device as claimed in claim 7, is characterized in that, described first process subelement, also for:
If search less than, then return miscue information to described PBX server.
9. device as claimed in claim 6, is characterized in that, described second process subelement, specifically for:
Obtain the called number carried in described second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that described called number is corresponding;
If find, described called number is converted to the PBX number found.
10. device as claimed in claim 9, is characterized in that, described second process subelement, also for:
If search less than, then return miscue information to described IMS business platform.
11. 1 kinds of SIP gateway devices, it is characterized in that, comprise the first audio call unit and/or the second audio call unit, described first audio call unit comprises first transceiver and first processor, described second audio call unit comprises second transceiver and the second processor, wherein:
Described first transceiver, for receiving the first voice call request from dedicated packet switched PBX server; And, by the IMS business platform that the first voice call request after described first processor conversion sends to called internet protocol multi-media sub-system IMS terminal to register, indicate described IMS business platform to call out described called IMS terminal, described first voice call request is that caller PBX terminal sends during called IMS terminal to described in described PBX server request audio call;
Described first processor, for changing the called number carried in described first voice call request;
Described second transceiver, for receiving the second voice call request from described IMS business platform; And, the second voice call request after described second processor conversion is sent to the PBX server of called PBX terminal attaching, indicate called PBX terminal described in described PBX server call, described second voice call request is that caller IMS terminal sends during called PBX terminal to described in described IMS business platform request audio call;
Described second processor, for changing the called number carried in described second voice call request.
12. SIP gateway devices as claimed in claim 11, is characterized in that, described first processor, specifically for:
Obtain the called number carried in described first voice call request;
According to the corresponding relation of the PBX virtual-number preserved in advance and IMS number, search the IMS number that described called number is corresponding;
If find, described called number is converted to the IMS number found.
13. SIP gateway devices as claimed in claim 12, is characterized in that, described first processor, also for:
If search less than, then return miscue information to described PBX server.
14. SIP gateway devices as claimed in claim 11, is characterized in that, described second processor, specifically for:
Obtain the called number carried in described second voice call request;
According to the corresponding relation of the IMS virtual-number preserved in advance and PBX number, search the PBX number that described called number is corresponding;
If find, described called number is converted to the PBX number found.
15. SIP gateway devices as claimed in claim 14, is characterized in that, described second processor, also for:
If search less than, then return miscue information to described IMS business platform.
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| CN110121166A (en) * | 2019-05-28 | 2019-08-13 | 中国联合网络通信集团有限公司 | A kind of call method for building up and system |
| CN110191516A (en) * | 2019-06-17 | 2019-08-30 | 中国联合网络通信集团有限公司 | A kind of call method for building up and system |
| CN110312251A (en) * | 2019-07-10 | 2019-10-08 | 中国联合网络通信集团有限公司 | Communication means and system, service call session control function entity, user terminal |
| CN113079174A (en) * | 2021-04-13 | 2021-07-06 | 广州掌动智能科技有限公司 | 4G or 5G-based voice call method and system and computer main equipment |
| CN116016459A (en) * | 2022-12-28 | 2023-04-25 | 中国联合网络通信集团有限公司 | Audio/video conference call method, system and storage medium |
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| CN110191516B (en) * | 2019-06-17 | 2023-03-24 | 中国联合网络通信集团有限公司 | Call establishment method and system |
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