CN103634303A - Method and system for realizing VoIP (voice over internet protocol) communication - Google Patents
Method and system for realizing VoIP (voice over internet protocol) communication Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing VoIP (voice over internet protocol) communication. The method comprises the steps of receiving a call request from a calling VoIP client through a soft switch server, determining one of the calling VoIP client and a called VoIP client to be subjected to the protection of an NAT (network address translation) firewall; utilizing a grade with highest grade information in the calling VoIP client and the called VoIP client as the communication grade of the current VoIP communication through the soft switch server; selecting a medium proxy server corresponding to the current communication grade through the soft switch server, and utilizing the selected media proxy server between the calling VoIP client and the called VoIP client to transmit the media stream. The method is used for distinguishing users, so that the voice service in differential communication quality is provided for different users. Furthermore, after the user communication is established, the voice service quality is dynamically adjusted according to the variation of a user network; moreover, after the user communication is established, the voice service quality is dynamically adjusted according to the variation of the server load situation.
Description
Technical field
The present invention relates to the networking telephone (VoIP, Voice over Internet Protocol) technology, espespecially a kind of method and system that realize VoIP call.
Background technology
Along with the fast development of mobile Internet, OTT company, attempting impacting traditional core business of operator, provides VoIP business one after another in a large number.The voice medium data of VoIP are used RTP (RTP, Real-time Transport Protocol) to transmit conventionally, and still, Real-time Transport Protocol is difficult to ensure voice call quality.
In prior art, conventionally use calling and Media proxy mechanism to realize VoIP service, use soft switching server to control call signaling, use media proxy server that the forwarding service of RTP audio medium stream is provided.In prior art, conventionally in call signaling, carry the information of Media proxy service.In prior art, can not distinguish user, so that the voice service of differentiation speech quality to be provided; Can not, after user's communication is set up, according to the variation of user network, dynamically adjust QoS of voice; Can not, after user's communication is set up, according to service end loading condition, change and dynamically adjust QoS of voice.That is to say, the realization of existing voip technology can not be adjusted voice call quality in real time, thereby can not guarantee as user provides high-quality session services, thereby has reduced user's experience.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method and system of the VoIP of realization call, can distinguish user, so that the voice service of differentiation speech quality to be provided.
In order to reach the object of the invention, the invention provides a kind of method of the VoIP of realization call, divide in advance the grade of VoIP client; Also comprise: soft switching server is received the call request from caller VoIP client, determine that in caller VoIP client and called VoIP client, any is subject to NAT firewall protection;
The call grade of soft switching server using caller VoIP client and the high grade of called VoIP client middle grade information as this VoIP call;
Soft switching server is selected the media proxy server of corresponding this call grade, uses the media proxy server of selecting to carry out the transmission of Media Stream between caller VoIP client and called VoIP client.
Set in advance medium load threshold value; Before the method, also comprise:
Described media proxy server regularly reports media load condition separately to medium load watch-dog, when the media load of media proxy server surpasses described medium load threshold value, medium load watch-dog determines that the state of this media proxy server is unavailable, otherwise state is available.
Divide in advance the grade of described media proxy server;
Described soft switching server selects the media proxy server of corresponding this call grade to comprise:
Described soft switch service system to medium load watch-dog inquiry all meet this call grade, state is available media proxy server, and the IP address information list of the media proxy server inquiring is defined as to the alternative media proxy server list of this call.
If do not inquire meet this call grade, state is available media proxy server, the method also comprises:
Described medium load watch-dog to soft switching server, return all one-level grades call grade, state is available media proxy server;
Described soft switching server is defined as the IP address information list of the media proxy server of these one-level grade the alternative media proxy server list of this call, and is designated time one-level.
The transmission of using the media proxy server of selecting to carry out Media Stream between described caller VoIP client and called VoIP client comprises:
Described soft switching server sends the call request that carries alternative media proxy server list to called VoIP client; After described called VoIP client is answered, to described soft switching server, send response message, the first address in described alternative media proxy server list sends RTP bag; Meanwhile,
Described soft switching server sends the call setup success message that carries alternative media proxy server list to caller VoIP client, described caller VoIP client sends RTP bag to the first address in alternative media proxy server list.
If when described caller VoIP client, called VoIP client are not all subject to the protection of NAT fire compartment wall, the method comprises:
Described soft switching server control caller VoIP client and called VoIP client, after call is set up, are used the point-to-point RTP bag mode of direct transferring to carry out voice call.
The method also comprises: according to network quality, dynamically adjust media proxy server; Describedly according to network quality, dynamically adjust media proxy server and comprise:
Described caller VoIP client and the called VoIP client both sides total medium proxy server address all periodically, in described alternative media proxy server list sends network quality probe data packet;
Each media proxy server will report described medium load watch-dog with the communication quality result of caller VoIP client, called VoIP client separately, described medium load watch-dog is according to current network quality, judgement is suitable for the media proxy server of this call, and the voice coding modes that is suitable for guaranteeing speech quality between VoIP client most, and report described soft switching server;
Described soft switching server, by IP address and the voice coding modes of the media proxy server of determining according to current network quality, sends to described caller VoIP client and called VoIP client;
Described caller VoIP client judges with called VoIP client that respectively whether this IP address is identical with the media proxy server IP address of current use, if different, caller VoIP client and called VoIP client send respectively RTP bag to this IP address, and use this IP address to carry out media services agency, adopt the definite voice coding modes of current network quality to carry out speech coding simultaneously.
The method also comprises: according to the loading condition of described media proxy server, dynamically adjust media proxy server; Describedly according to the loading condition of described media proxy server, dynamically adjust media proxy server and comprise:
If the load condition that described medium load watch-dog reports according to media proxy server, find that there is available, meet this call grade, and be superior to the media proxy server of alternative media proxy server list, described medium load watch-dog notice soft switching server;
Described soft switching server redefines new alternative services device list, and sends to caller VoIP client and called VoIP client simultaneously;
Described caller VoIP client and called VoIP client are stored respectively new alternative media proxy server list, and use the media proxy server in new alternative media proxy server list to carry out the transmission of Media Stream.
The present invention also provides a kind of VoIP of the realization system of call, comprises at least two VoIP clients, soft switching server, at least two media proxy servers, location register server, and medium load watch-dog; Wherein,
Soft switching server, for receiving the call request from caller VoIP client, determines that in caller VoIP client and called VoIP client, any is subject to NAT firewall protection; Call grade using caller VoIP client and the high grade of called VoIP client middle grade information as this VoIP call; To medium load watch-dog, inquire about and select the media proxy server of corresponding this call grade;
Media proxy server, for transmitting the Media Stream between caller VoIP client and called VoIP client;
Medium load watch-dog, wherein stores media proxy server grade and state, for receiving the inquiry from soft switching server, by meet this call grade, state is that available media proxy server returns to soft switching server;
Location register, for preserving the judged result that whether is subject to NAT firewall protection from the VoIP client of soft switching server, and IP address and the port numbers of VoIP client.
Described soft switching server, also for accepting the registration request of VoIP client, judges whether VoIP client is subject to NAT firewall protection, and the source IP address of judged result and registration message and port numbers is kept to location register server.
Described soft switching server; also for when judging caller VoIP client, called VoIP client and not all being subject to the protection of NAT fire compartment wall; control caller VoIP client and called VoIP client after call is set up, use the point-to-point RTP bag mode of direct transferring to carry out voice call.
Described soft switching server, also for after setting up in call between caller VoIP client and called VoIP client, according to user network quality Dynamic Selection more suitably media proxy server to adjust QoS of voice.
Described soft switching server, also for after setting up in call between caller VoIP client and called VoIP client, according to the loading condition Dynamic Selection of media proxy server more suitably media proxy server to adjust QoS of voice.
Described media proxy server, also for regularly reporting the media load condition of self to medium load watch-dog;
Described medium load watch-dog, is wherein provided with medium load threshold value, and while also surpassing medium load threshold value for the media load at media proxy server, the state of determining this media proxy server is unavailable, otherwise state is available.
Compared with prior art, the present invention includes soft switching server and receive the call request from caller VoIP client, determine that in caller VoIP client and called VoIP client, any is subject to NAT firewall protection; The call grade of soft switching server using caller VoIP client and the high grade of called VoIP client middle grade information as this VoIP call; Soft switching server is selected the media proxy server of corresponding this call grade, uses the media proxy server of selecting to carry out the transmission of Media Stream between caller VoIP client and called VoIP client.By the inventive method, user is distinguished, realized the voice service that differentiation speech quality is provided for different user.
Further, after user's communication is set up, realized according to the variation of user network and dynamically adjusted QoS of voice; Further, after user's communication is set up, realized according to service end loading condition and changed and dynamically adjust QoS of voice.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in specification, claims and accompanying drawing.
Accompanying drawing explanation
Accompanying drawing is used to provide the further understanding to technical solution of the present invention, and forms a part for specification, is used from explanation technical scheme of the present invention with the application's embodiment mono-, does not form the restriction to technical solution of the present invention.
Fig. 1 is the flow chart that the present invention realizes the method for VoIP call;
Fig. 2 is the composition structural representation that the present invention realizes the system of VoIP call;
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
In the step shown in the flow chart of accompanying drawing, can in the computer system such as one group of computer executable instructions, carry out.And, although there is shown logical order in flow process, in some cases, can carry out shown or described step with the order being different from herein.
Fig. 1 is the flow chart that the present invention realizes the method for VoIP call, as shown in Figure 1, comprising:
Step 100: soft switching server is received the call request from caller VoIP client, determines that in caller VoIP client and called VoIP client, any is subject to NAT firewall protection.
Also comprise before this step: in advance in system all VoIP clients carry out grade classification, division according to the use duration, the cumulative consumption amount of money etc. that can include but not limited to user, higher grade represents that the contributed value of this VoIP client is higher.Such as VoIP client being divided into A, B, tri-grades of successively decreasing of C.
Before this step, also comprise the registration of VoIP client, specifically comprise: user starts after VoIP client, VoIP client is registered to soft switching server, self user account information (as name on account, password), local ip address and port number information is carried at simultaneously and in registration message, sends to soft switching server; Soft interactive server is according to the source IP address and the port numbers that receive registration message; with the local ip address carrying in registration message and port number information; judge whether VoIP client is subject to network address translation (NAT; Network Address Translation) firewall protection is after NAT fire compartment wall, and the source IP address of judged result and registration message and port numbers are kept in location register server.
This step specifically comprises:
When a certain VoIP client (caller VoIP client) makes a call to another VoIP client (called VoIP client), caller VoIP client is sent to soft switching server by call request, in call request, at least carry the caller accounts informations such as name on account of caller VoIP client, the called accounts informations such as name on account of called VoIP client, and the voice coding modes information in the call of caller VoIP client requirement;
Whether soft switching server, according to caller accounts information and called accounts information, is subject to NAT firewall protection to location register server lookup caller VoIP client, called VoIP client, and IP address, the port number information of called VoIP client.
Step 101: the call grade of soft switching server using caller VoIP client and the high grade of called VoIP client middle grade information as this VoIP call.
In this step; if have a side in caller VoIP client, called VoIP client; or two Fang Jun are subject to NAT firewall protection after NAT fire compartment wall; the class information of soft switching server inquiry caller VoIP client and called VoIP client, soft switching server is chosen wherein higher grade as the call grade of this call request.
Step 102: soft switching server is selected the media proxy server of corresponding this call grade, is used the media proxy server of selecting to carry out the transmission of Media Stream between caller VoIP client and called VoIP client.
Before this step, also comprise: in advance total medium proxy server in system is carried out to grade classification, and be divided into and the differential identical grade of VoIP client level, divide according to the quality etc. that can include but not limited to media proxy server and intercomminication between networks from different operational managers, quality is more high-grade higher.Such as media proxy server being divided into A, B, tri-grades of successively decreasing of C.
This step specifically comprises: soft switch service system to medium load watch-dog inquiry all meet this call grade, state is available media proxy server, and the IP address information list of the media proxy server inquiring is defined as to the alternative media proxy server list of this call; Wherein, media proxy server can regularly report media load condition separately to medium load watch-dog, in medium load watch-dog, be provided with medium load threshold value, when the media load of media proxy server surpasses medium load threshold value, medium load watch-dog thinks that the state of this media proxy server is unavailable, otherwise state is available.
Afterwards, soft switching server sends call request to called VoIP client, in call request, carry the caller accounts informations such as name on account of caller VoIP client, alternative media proxy server list, and the voice coding modes in the call of caller VoIP client requirement; After called VoIP client is answered, to soft switching server, send response message, meanwhile, the first address in alternative media proxy server list sends RTP bag; Meanwhile,
Soft switching server sends call setup success message to caller VoIP client, carries alternative media proxy server list in call setup success message, and caller VoIP client sends RTP bag to the first address in alternative media proxy server list.So far, call is successfully established, and caller VoIP client is used the media proxy server of corresponding current talking grade to carry out the transmission of Media Stream with called VoIP client, and the voice coding modes that all adopts caller VoIP client to require carries out speech coding.
In this step, when soft switching server is selected the media proxy server of corresponding this call grade, if do not inquire meet this call grade, state is available media proxy server, medium load watch-dog to soft switching server, return the call grade of all one-level grades, state is available media proxy server, soft switching server is defined as the IP address information list of the media proxy server of these one-level grade the alternative media proxy server list of this call, and is designated time one-level.
The inventive method also comprises: if caller VoIP client, called VoIP client all or not be not subject to the protection of NAT fire compartment wall after NAT fire compartment wall; soft switching server control caller VoIP client and called VoIP client, after call is set up, are used the point-to-point RTP bag mode of direct transferring to carry out voice call.
After between caller VoIP client and called VoIP client, call is set up, the inventive method also comprises: according to network quality Dynamic Selection, more suitably adjust media proxy server to adjust QoS of voice.Specific as follows:
After between caller VoIP client and called VoIP client, call is set up, both sides all periodically send network quality probe data packet to the total medium proxy server address in alternative media proxy server list;
Each media proxy server will report medium load watch-dog with the communication quality result of caller VoIP client, called VoIP client separately, medium load watch-dog is according to current network quality, judgement is suitable for the media proxy server of this call most, and the voice coding modes that is suitable for guaranteeing speech quality between VoIP client most, and report soft switching server;
Soft switching server, by IP address and the voice coding modes of the media proxy server of determining according to current network quality, sends to caller VoIP client and called VoIP client; Caller VoIP client judges with called VoIP client that respectively whether this IP address is identical with the media proxy server IP address of current use, if different, caller VoIP client and called VoIP client send respectively RTP bag to this IP address, and use this IP address to carry out Media proxy, adopt the definite voice coding modes of current network quality to carry out speech coding simultaneously; If identical, caller VoIP client and the called VoIP client media proxy server before still using, and adopt according to the definite voice coding modes of current network quality simultaneously and carry out speech coding.
Afterwards, caller VoIP client and called VoIP client both sides, all periodically send network quality probe data packet to the total medium proxy server address in alternative media proxy server list.
After between caller VoIP client and called VoIP client, call is set up, the inventive method also comprises: according to the loading condition Dynamic Selection of media proxy server, more suitably adjust media proxy server to adjust QoS of voice.Specific as follows:
If the load condition that medium load watch-dog reports according to media proxy server, find that there is available, meet this call grade, and be superior to the media proxy server of alternative media proxy server list, medium load watch-dog notice soft switching server, soft switching server redefines new alternative services device list, and sends to caller VoIP client and called VoIP client simultaneously; Caller VoIP client and called VoIP client are stored respectively new alternative media proxy server list, and use the media proxy server in new alternative media proxy server list to carry out the transmission of Media Stream.
Afterwards, caller VoIP client and called VoIP client both sides, all periodically send network quality probe data packet to the total medium proxy server address in alternative media proxy server list.
Fig. 2 is the composition structural representation that the present invention realizes the system of VoIP call, as shown in Figure 2, comprises at least two VoIP clients, soft switching server, at least two media proxy servers, location register server, and medium load watch-dog; Wherein,
Soft switching server, for receiving the call request from caller VoIP client, determines that in caller VoIP client and called VoIP client, any is subject to NAT firewall protection; Call grade using caller VoIP client and the high grade of called VoIP client middle grade information as this VoIP call; To medium load watch-dog, inquire about and select the media proxy server of corresponding this call grade;
Soft switching server, also for accepting the registration request of VoIP client, judges whether VoIP client is subject to NAT firewall protection, and the source IP address of judged result and registration message and port numbers is kept to location register server.
Media proxy server, for transmitting the Media Stream between caller VoIP client and called VoIP client;
Medium load watch-dog, wherein stores media proxy server grade and state, for receiving the inquiry from soft switching server, by meet this call grade, state is that available media proxy server returns to soft switching server;
Location register, for preserving the judged result that whether is subject to NAT firewall protection from the VoIP client of soft switching server, and IP address and the port numbers of VoIP client.
Soft switching server; also for when judging caller VoIP client, called VoIP client and not all being subject to the protection of NAT fire compartment wall; control caller VoIP client and called VoIP client after call is set up, use the point-to-point RTP bag mode of direct transferring to carry out voice call.
Soft switching server, also for after setting up in call between caller VoIP client and called VoIP client, according to user network quality Dynamic Selection more suitably media proxy server to adjust QoS of voice.
Soft switching server, also for after setting up in call between caller VoIP client and called VoIP client, according to the loading condition Dynamic Selection of media proxy server more suitably media proxy server to adjust QoS of voice.
Media proxy server, also for regularly reporting the media load condition of self to medium load watch-dog;
Medium load watch-dog, is wherein provided with medium load threshold value, and while also surpassing medium load threshold value for the media load at media proxy server, the state of determining this media proxy server is unavailable, otherwise state is available.
Although the disclosed execution mode of the present invention as above, the execution mode that described content only adopts for ease of understanding the present invention, not in order to limit the present invention.Those of skill in the art under any the present invention; do not departing under the prerequisite of the disclosed spirit and scope of the present invention; can in the form of implementing and details, carry out any modification and variation; but scope of patent protection of the present invention, still must be as the criterion with the scope that appending claims was defined.
Claims (14)
1. a method that realizes VoIP call, is characterized in that, divides in advance the grade of VoIP client; Also comprise: soft switching server is received the call request from caller VoIP client, determine that in caller VoIP client and called VoIP client, any is subject to NAT firewall protection;
The call grade of soft switching server using caller VoIP client and the high grade of called VoIP client middle grade information as this VoIP call;
Soft switching server is selected the media proxy server of corresponding this call grade, uses the media proxy server of selecting to carry out the transmission of Media Stream between caller VoIP client and called VoIP client.
2. method according to claim 1, is characterized in that, sets in advance medium load threshold value; Before the method, also comprise:
Described media proxy server regularly reports media load condition separately to medium load watch-dog, when the media load of media proxy server surpasses described medium load threshold value, medium load watch-dog determines that the state of this media proxy server is unavailable, otherwise state is available.
3. method according to claim 2, is characterized in that, divides in advance the grade of described media proxy server;
Described soft switching server selects the media proxy server of corresponding this call grade to comprise:
Described soft switch service system to medium load watch-dog inquiry all meet this call grade, state is available media proxy server, and the IP address information list of the media proxy server inquiring is defined as to the alternative media proxy server list of this call.
4. method according to claim 3, is characterized in that, if do not inquire meet this call grade, state is available media proxy server, the method also comprises:
Described medium load watch-dog to soft switching server, return all one-level grades call grade, state is available media proxy server;
Described soft switching server is defined as the IP address information list of the media proxy server of these one-level grade the alternative media proxy server list of this call, and is designated time one-level.
5. according to the method described in claim 3 or 4, it is characterized in that, the transmission of using the media proxy server of selecting to carry out Media Stream between described caller VoIP client and called VoIP client comprises:
Described soft switching server sends the call request that carries alternative media proxy server list to called VoIP client; After described called VoIP client is answered, to described soft switching server, send response message, the first address in described alternative media proxy server list sends RTP bag; Meanwhile,
Described soft switching server sends the call setup success message that carries alternative media proxy server list to caller VoIP client, described caller VoIP client sends RTP bag to the first address in alternative media proxy server list.
6. method according to claim 1, is characterized in that, if when described caller VoIP client, called VoIP client are not all subject to the protection of NAT fire compartment wall, the method comprises:
Described soft switching server control caller VoIP client and called VoIP client, after call is set up, are used the point-to-point RTP bag mode of direct transferring to carry out voice call.
7. according to the method described in claim 1 or 3, it is characterized in that, the method also comprises: according to network quality, dynamically adjust media proxy server; Describedly according to network quality, dynamically adjust media proxy server and comprise:
Described caller VoIP client and the called VoIP client both sides total medium proxy server address all periodically, in described alternative media proxy server list sends network quality probe data packet;
Each media proxy server will report described medium load watch-dog with the communication quality result of caller VoIP client, called VoIP client separately, described medium load watch-dog is according to current network quality, judgement is suitable for the media proxy server of this call, and the voice coding modes that is suitable for guaranteeing speech quality between VoIP client most, and report described soft switching server;
Described soft switching server, by IP address and the voice coding modes of the media proxy server of determining according to current network quality, sends to described caller VoIP client and called VoIP client;
Described caller VoIP client judges with called VoIP client that respectively whether this IP address is identical with the media proxy server IP address of current use, if different, caller VoIP client and called VoIP client send respectively RTP bag to this IP address, and use this IP address to carry out media services agency, adopt the definite voice coding modes of current network quality to carry out speech coding simultaneously.
8. according to the method described in claim 1 or 3, it is characterized in that, the method also comprises: according to the loading condition of described media proxy server, dynamically adjust media proxy server; Describedly according to the loading condition of described media proxy server, dynamically adjust media proxy server and comprise:
If the load condition that described medium load watch-dog reports according to media proxy server, find that there is available, meet this call grade, and be superior to the media proxy server of alternative media proxy server list, described medium load watch-dog notice soft switching server;
Described soft switching server redefines new alternative services device list, and sends to caller VoIP client and called VoIP client simultaneously;
Described caller VoIP client and called VoIP client are stored respectively new alternative media proxy server list, and use the media proxy server in new alternative media proxy server list to carry out the transmission of Media Stream.
9. a system that realizes VoIP call, is characterized in that, comprises at least two VoIP clients, soft switching server, at least two media proxy servers, location register server, and medium load watch-dog; Wherein,
Soft switching server, for receiving the call request from caller VoIP client, determines that in caller VoIP client and called VoIP client, any is subject to NAT firewall protection; Call grade using caller VoIP client and the high grade of called VoIP client middle grade information as this VoIP call; To medium load watch-dog, inquire about and select the media proxy server of corresponding this call grade;
Media proxy server, for transmitting the Media Stream between caller VoIP client and called VoIP client;
Medium load watch-dog, wherein stores media proxy server grade and state, for receiving the inquiry from soft switching server, by meet this call grade, state is that available media proxy server returns to soft switching server;
Location register, for preserving the judged result that whether is subject to NAT firewall protection from the VoIP client of soft switching server, and IP address and the port numbers of VoIP client.
10. system according to claim 9; it is characterized in that; described soft switching server; also for accepting the registration request of VoIP client; judge whether VoIP client is subject to NAT firewall protection, and the source IP address of judged result and registration message and port numbers are kept to location register server.
11. systems according to claim 10, is characterized in that,
Described soft switching server; also for when judging caller VoIP client, called VoIP client and not all being subject to the protection of NAT fire compartment wall; control caller VoIP client and called VoIP client after call is set up, use the point-to-point RTP bag mode of direct transferring to carry out voice call.
12. according to the system described in claim 10 or 11, it is characterized in that,
Described soft switching server, also for after setting up in call between caller VoIP client and called VoIP client, according to user network quality Dynamic Selection more suitably media proxy server to adjust QoS of voice.
13. according to the system described in claim 10 or 11, it is characterized in that,
Described soft switching server, also for after setting up in call between caller VoIP client and called VoIP client, according to the loading condition Dynamic Selection of media proxy server more suitably media proxy server to adjust QoS of voice.
14. systems according to claim 9, is characterized in that, described media proxy server, also for regularly reporting the media load condition of self to medium load watch-dog;
Described medium load watch-dog, is wherein provided with medium load threshold value, and while also surpassing medium load threshold value for the media load at media proxy server, the state of determining this media proxy server is unavailable, otherwise state is available.
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| CN111953855A (en) * | 2020-08-24 | 2020-11-17 | 成都卫士通信息产业股份有限公司 | VOIP call method, device, system, equipment and readable storage medium |
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