CN102413110A - Communication method and system for multiple registration using session initiation protocol - Google Patents

Abstract

A communication method and system of multiple registration using session initiation protocol includes client end, relay server and multiple SIP servers, among which, the relay server is connected with multiple SIP servers and client end. In addition, the relay server establishes the online with the client in a configuration mode, and registers to the SIP servers in the configuration mode, so that the client directly communicates with the selected SIP server by further selecting at least one of the SIP servers. Therefore, the problems of poor compatibility between the SIP server and the client and poor compatibility between the SIP servers can be solved, and a scheme for saving communication cost can be provided aiming at different dialing numbers of the client.

Description

Communication method and system for multiple registrations using session initiation protocol

technical field

The present invention relates to a communication method and system using session initiation protocol, in particular to a communication method and system using session initiation protocol for multiple registration.

Background technique

Early voice communications were built on the Public Switched Telephone Network (PSTN) deployed by telecommunication service companies. PSTN is a telephone switching network used for global voice communication. It is currently the largest network in the world, with hundreds of millions of users. And along with the advancement of the Internet, voice communication can also be realized on the Internet, and the most popular technology at present is exactly VoIP (Voice over Internet Protocol, VoIP). To put it simply, VoIP converts the voice analog signal at the sending end into a digital signal, and then transmits it to the receiving end through the Internet, and the receiving end converts the digital signal into a voice analog signal to realize voice communication on the Internet. The most commonly used communication protocol is Session Initiation Protocol (SIP). In addition, there is another IP private branch exchange (IP PBX), which uses digital signals to communicate directly on the Internet.

On the other hand, due to the development of communication technology, in addition to the above-mentioned public switched telephone network and VoIP, wireless communication technologies such as GSM (Global System for Mobile Communication) mobile phone network and third-generation (3G) mobile phone network have also developed. is quite mature. And the existing communication method using SIP is that the SIP user sends the communication request to the SIP server of the telecommunication service company, and the SIP server forwards the communication request to different telephone networks according to the called number in the communication request, such as public switched telephone Internet, VoIP, etc., to complete the communication connection.

However, in an environment with multiple SIP servers, since the multiple SIP servers may belong to different telecommunications service companies, the compatibility between the SIP servers is not good, so it is impossible to set up a SIP trunk between the SIP servers. , and cannot communicate normally. In addition, because the compatibility between the client and the SIP server provided by the telecommunications service company is not high, some clients cannot register with the incompatible SIP server, or the incompatible SIP server cannot set up a SIP trunk with the client. It also causes abnormal communication. Furthermore, the client in the network address translation (Network Address Translation, NAT) environment will also encounter some problems. When the client requests registration from the above SIP server, the NAT server will convert the virtual network address in the enterprise into The physical network address outside the enterprise causes the SIP server to fail to respond to the original client with the registration result, resulting in the inability to register and thus causing abnormal communication. Finally, because the existing communication method using SIP transfers the communication request to different telephone networks in a fixed manner according to the called number, there is no solution for saving communication costs for different dialing numbers of the client.

To sum up, in the existing communication system, due to poor compatibility or the limitation of the NAT environment, the client cannot register with the SIP server, and there is also a problem of poor compatibility between the SIP servers, and there is no target for customers. Different dialing numbers at different terminals provide a solution to save communication costs. Therefore, there is a great need for a multi-registration communication method and system using SIP to solve the problem of poor compatibility between the SIP server and the client and the poor compatibility between the SIP servers, and can provide different dialing numbers for the client. A plan to save communication costs.

Contents of the invention

The present invention provides a multi-registration communication method and system using the Session Initiation Protocol to solve the problems of poor compatibility between SIP servers and clients and poor compatibility between SIP servers in the prior art, and can address the problems of clients Different dialing numbers provide a solution to save communication costs.

According to one embodiment of the present invention, there is provided a communication method using multiple registrations of the Session Initiation Protocol, comprising the following steps: making the relay server establish a connection with the client; making the relay server register with multiple SIP servers ; making the client use SIP to send a communication request to the relay server; making the relay server select at least one of the plurality of SIP servers and sending the communication request to the selected SIP server; and, making the SIP After checking the content of the SIP packet, the server judges whether to allow the communication request, and transmits the judgment result to the client via the relay server.

In addition, the present invention also provides a multi-registration communication system using the session initiation protocol, including: a relay server, which is built on the Internet and connected to the client through the Internet; and a plurality of session initiation protocol servers, which are built on the Internet and connect with the relay server, wherein the relay server establishes connection with the client through the configuration method, and the relay server registers with the plurality of session initiation protocol servers through the configuration method, and The client is configured to use the session initiation protocol to transmit the communication request to the relay server, and the relay server selects at least one of the plurality of session initiation protocol servers and transmits the communication request to the selected session initiation protocol A protocol server, and the SIP server checks the packet content of the SIP through configuration, judges whether to allow the communication request, and transmits the judgment result to the client via the relay server.

As mentioned above, compared with the prior art, the present invention utilizes the relay server to establish connection with the client on the one hand, and to register with multiple SIP servers on the other hand, so that by selecting at least one of the multiple SIP servers, Enables the client to communicate directly with the selected SIP server. In this way, the problem of poor compatibility between the SIP server and the client and between SIP servers is solved, and a solution for saving communication costs can be provided for different dial numbers of the client.

Description of drawings

FIG. 1 is a system architecture diagram of the first embodiment of the communication system using multiple registrations of the session initiation protocol of the present invention;

FIG. 2 is a flow chart of the first embodiment of the communication method using multiple registrations of the session initiation protocol of the present invention;

FIG. 3 is a system architecture diagram of a second embodiment of a communication system using multiple registrations of the session initiation protocol of the present invention;

FIG. 4 is a flowchart of a second embodiment of the communication method using multiple registrations of the session initiation protocol of the present invention;

FIG. 5 is a system architecture diagram of a third embodiment of a communication system using multiple registrations of the session initiation protocol of the present invention;

FIG. 6 is a flow chart of a third embodiment of the communication method using multiple registrations of the Session Initiation Protocol of the present invention.

[Description of main component symbols]

100, 300, 500 communication system

110 IP PBX

120, 320NAT server

125, 325 routing table

130, 330, 530 relay server

135, 335, 535 record form

138, 338, 538 dial table

140, 340, 540SIP server

150, 350, 550 servers with LDAP

160, 360, 560 called number terminal

200, 400, 600 communication methods

310VoIP

315VoIP Gateway

510 client

S210, S220, S225, S230, S235, S240, S250, S255 steps

S260, S270, S280, S290, S410, S420, S425, S430 steps

S435, S440, S450, S455, S460, S470, S480, S490 steps

S610, S620, S625, S630, S635, S640, S650, S655 steps

S660, S670, S680, S690 steps

Detailed ways

The implementation of the present invention is described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

First embodiment:

Please refer to FIG. 1 , which is a system architecture diagram of a first embodiment of a communication system 100 using SIP multiple registration according to the present invention.

As shown in Figure 1, the multiple registration communication system 100 architecture of the present invention using session initiation protocol is on the Internet, including IP private branch exchange (hereinafter referred to as IP PBX) 110, NAT server 120, relay server 130, a plurality of SIP servers 140. Wherein, a plurality of SIP servers 140 may be multimedia communication servers (Multimedia Communication Server), but not limited thereto, the relay server 130 has a recording table 135 for recording the communication data between the SIP server 140 and the IP PBX 110, This includes, but is not limited to, communication time. The relay server 130 also has a dialing table (telephony table) 138 for recording the correspondence between the dialing numbers of the SIP server 140 and the IP PBX 110. NAT server 120 has routing table (routing table) 125, in order to record the address and port before NAT server 120 conversion and the address and port after NAT server 120 conversion. In addition, the number of IP PBX 110 and SIP server 140 in this embodiment is 2, but this is only for illustration. In different embodiments, the number of IP PBX 110 and SIP server 140 is not limited to 2 .

In the system 100 of the present invention, the IP PBX 110 is connected to the NAT server 120, and the NAT server 120 can convert the input virtual network address and port into a physical network address and port, and convert the input virtual network address and port and the converted The physical network addresses and ports of the physical network are stored in the routing table 125 . The relay server 130 is connected to the IPPBX 110 through the NAT server 120. A plurality of SIP servers 140 are connected to the relay server 130 .

In addition, in the system 100 of the present invention, also can optionally include the server (hereinafter referred to as the server with LDAP) 150 with Lightweight Directory Access Protocol (Lightweight Directory Access Protocol, LDAP), it is connected with relay server 130, with Manage account and password.

Furthermore, in the system 100 of the present invention, the called number terminal 160 is also included, which is connected to the SIP server 140 to transmit the communication packet. The connection relationship between the called number terminal 160 and the SIP server 140 in this embodiment For illustrative purposes only, in different embodiments, the called number terminal 160 can be connected to other SIP servers 140 .

Please refer to Fig. 2, which is a flow chart of the first embodiment of the communication method 200 using the multiple registration of the session initiation protocol according to the present invention, wherein, the IP PBX 110, the relay server 130, and the SIP server 140 perform the following configurations step.

As shown in Figure 2, in step S210, provide IP PBX 110, relay server 130 and a plurality of SIP servers 140 on the Internet, wherein, relay server 130 is connected with a plurality of SIP servers 140, and through NAT server 120 and IP PBX 110 connection. Then proceed to step S220.

In step S220, the relay server 130 sets the backbone with the IP PBX 110, and registers with a plurality of SIP servers 140, wherein the plurality of SIP servers 140 check the registered account number and/or password, and determine whether to allow The result of this registration is transmitted to the relay server 130 . If it is allowed, then send the permission registration request, and go to step S225; if not, send the denial registration request, and end this procedure.

In step S225 , the relay server 130 will listen to whether there is a communication request to be sent to the relay server 130 . If yes, proceed to step S230; if not, continue to execute step S225.

In step S230, when the IP PBX 110 uses SIP to transmit the communication request to the relay server 130 through the NAT server 120, the relay server 130 uses the dial table 138 to select at least one of the plurality of SIP servers 140, preferably, The relay server 130 selects at least one of the plurality of SIP servers 140 according to the correspondence between the SIP server 140 in the dial table 138 and the dialing number of the IP PBX 110. In addition, the relay server 130 changes the package content of the SIP. Preferably, the change of the package content of the SIP is to change the source of the SIP header (header) in the package content from the address and port before the conversion by the NAT server 120 to the The address and port of the server 130. Then proceed to step S235.

In step S235 , the relay server 130 transmits the communication request to the selected SIP server 140 . Then proceed to step S240.

In step S240, the SIP server 140 checks the content of the SIP packet, wherein checking the content of the SIP packet includes checking the address and port, account, domain of the SIP, called number, and/or the maximum number of simultaneous calls. Then proceed to step S250.

In step S250, the SIP server 140 judges whether to allow the communication request according to the inspection result, and after confirming that the communication status of the called number terminal 160 is normal, the result of whether to allow the communication request is sent to the IP PBX via the relay server 130 110, wherein, when the SIP server 140 uses SIP to transmit the result of the communication request to the IP PBX 110 via the relay server 130, the relay server 130 changes the package content of the SIP, preferably, the package content of the changed SIP is the The source of the SIP header in the packet content is changed from the address and port of the SIP server 140 to the address and port before being translated by the NAT server 120 . If the communication request is allowed, go to step S260; if not, go to step S255.

In step S255, SIP server 140 responds that IP PBX 110 does not allow this communication request by relay server 130, and ends this communication request, then returns to step S225. In addition, in different embodiments of the present invention, after the communication request is terminated, the program can also be selectively terminated directly.

In step S260, the SIP server 140 responds to the result that the IP PBX 110 allows the communication request through the relay server 130, and the relay server 130 establishes a communication channel with the IP PBX 110, and the relay server 130 selects to use the account number of the corresponding SIP server 140 and Establish a communication channel with the SIP server 140 to transmit the communication packet to the called number terminal 160 connected to the corresponding SIP server 140, and the relay server 130 records communication data such as the time of establishing the communication channel to further authenticate and manage IP PBX 110. Then proceed to step S270.

In step S270, when the IP PBX 110 transmits the communication packet to the relay server 130, the relay server 130 records the address and port of the Real-time Transfer Protocol (RTP) used by the IP PBX 110. On the other hand, the relay server 130 sends a re-invite request to the IP PBX 110, and changes the address and port of the RTP used by the IP PBX 110, so that the IP PBX 110 communicates directly with the SIP server 140. When the SIP server 140 transmits the communication packet to the relay server 130 , the relay server 130 records the address and port of the RTP used by the SIP server 140 . On the other hand, the relay server 130 sends a re-invitation request to the SIP server 140, and changes the address and port of the RTP used by the SIP server 140, so that the IP PBX 110 communicates directly with the SIP server 140. Then go to step S280.

In step S280, when the IP PBX 110 ends the communication with the SIP server 140, the IPPBX 110 sends a communication end request to the relay server 130, and the relay server 130 records communication data such as the time when the communication channel ends for further authentication and management IP PBX 110. Then proceed to step S290.

In step S290, the relay server 130 transmits the end communication request to the SIP server 140 and ends the communication channel, and processes the communication data of establishing the communication channel and ending the communication channel to authenticate and manage the IP PBX 110. For example, it can be used to calculate the time of establishing the communication channel and the time of ending the communication channel, so as to calculate the communication fee, etc., but it is not limited thereto.

Second embodiment:

Please refer to FIG. 3 , which is a system architecture diagram of a second embodiment of a communication system 300 using SIP multiple registration according to the present invention. The main difference between this embodiment and the first embodiment is that this embodiment replaces the IP PBX of the first embodiment with VoIP and VoIP gateway. In this embodiment, the main application environment and steps are the same as those in the first embodiment, so the same parts will not be repeated here.

As shown in FIG. 3 , the system 300 of multiple registrations using the Session Initiation Protocol of the present invention is built on the Internet, including VoIP (VoIP) 310, VoIP gateway 315, NAT server 320, relay server 330, and multiple SIP servers 340, wherein, VoIP 310 is connected with VoIP gateway 315, and VoIP gateway 315 is connected with NAT server 320, and NAT server 320 can convert the input virtual network address and port into physical network address and port, and convert the input virtual network address and port The network address and port and the translated physical network address and port are stored in the routing table 325 . The relay server 330 is connected to the VoIP gateway 315 through the NAT server 320 , and the relay server 330 has a record table 335 and a dial table 338 . A plurality of SIP servers 340 are connected to the relay server 330 . In addition, the numbers of the VoIP 310, the VoIP gateway 315 and the SIP server 340 in this embodiment are all examples, and in different embodiments of the present invention, the numbers of the VoIP 310, the VoIP gateway 315 and the SIP server 340 are not the same This is the limit.

In addition, in the system 300 of the present invention, an LDAP server 350 may optionally be included to connect with the relay server 330 for account and password management.

Furthermore, in the system 300 of the present invention, the called number terminal 360 may optionally be included, and the called number terminal 360 is connected to the SIP server 340 to transmit communication packets. In this embodiment, the called number terminal The connection relationship between 360 and the SIP server 340 is only for illustration. In different embodiments of the present invention, the called number terminal 360 can be connected to other SIP servers 340 .

Please refer to FIG. 4 , which is a flowchart of a second embodiment of a communication method 400 using multiple registrations of the Session Initiation Protocol according to the present invention, wherein the VoIP gateway 315, the relay server 330, and the SIP server 340 are configured in a configuration manner. Follow the steps below.

As shown in Figure 4, in step S410, VoIP 310, VoIP gateway device 315, relay server 330 and a plurality of SIP servers 340 are provided on the Internet, wherein, VoIP 310 is connected with VoIP gateway device 315, and relay server 330 It is connected to a plurality of SIP servers 340 and is connected to a VoIP gateway 315 through a NAT server 320 . Then go to step S420.

In step S420, the VoIP gateway 315 registers with the relay server 330, and the relay server 330 registers with a plurality of SIP servers 340, wherein the plurality of SIP servers 340 check the registered account number and/or password, and determine whether to allow The result of this registration is transmitted to the relay server 330 . If yes, then send permission to register, and go to step S425; if not, send reject registration request, and end this procedure.

In step S425 , the relay server 330 monitors whether there is a communication request sent to the relay server 330 . If yes, proceed to step S430; if not, continue to execute step S425.

In step S430, when the VoIP gateway 315 uses SIP to transmit the communication request to the relay server 330 through the NAT server 320, the relay server 330 uses the dial table 338 to select at least one of the plurality of SIP servers 340, preferably , the relay server 330 selects at least one of the plurality of SIP servers 340 according to the corresponding relationship between the SIP server 340 in the dial table 338 and the dialing number of the VoIP gateway 315; in addition, the relay server 330 changes the SIP Packet content, preferably, changing the SIP packet content is to change the source of the SIP header in the packet content from the address and port before being converted by the NAT server 320 to the address and port of the relay server 330 . Then proceed to step S435.

In step S435 , the relay server 330 transmits the communication request to the selected SIP server 340 . Then proceed to step S440.

In step S440, the SIP server 340 checks the packet content of the SIP, wherein checking the packet content of the SIP includes checking address and port, account, domain of the SIP, called number and/or maximum number of simultaneous calls, etc. Then proceed to step S450.

In step S450, the SIP server 340 judges whether to allow the communication request based on the inspection result, and after confirming that the communication status of the called number terminal 360 is normal, sends the result of whether the communication request is allowed to the VoIP via the relay server 330 Gateway 315, wherein, when the SIP server 340 uses SIP to transmit the result of the communication request to the VoIP gateway 315 via the relay server 330, the relay server 330 changes the package content of the SIP, preferably, the package content of the changed SIP The source of the SIP header in the packet content is changed from the address and port of the SIP server 340 to the address and port before being translated by the NAT server 320 . If the communication request is allowed, go to step S460; if the communication request is not allowed, go to step S455.

In step S455, the SIP server 340 responds through the relay server 330 that the VoIP gateway 315 does not allow the communication request, and ends the communication request, and then returns to step S425. In addition, in different embodiments of the present invention, after the communication request is terminated, the program can also be selectively terminated directly.

In step S460, the SIP server 340 responds to the result that the VoIP gateway 315 allows the communication request through the relay server 330, and the relay server 330 establishes a communication channel with the VoIP gateway 315, and the relay server 330 selects to use the corresponding SIP server 340's account number and establishes a communication channel with the SIP server 340 to transmit the communication packet to the called number terminal 360 connected to the corresponding SIP server 340, and the relay server 330 records communication data such as the time of establishing the communication channel for further Authenticate and manage the VoIP gateway 315 . Then proceed to step S470.

In step S470 , when the VoIP gateway 315 transmits the communication packet to the relay server 330 , the relay server 330 records the address and port of the RTP used by the VoIP gateway 315 . On the other hand, the relay server 330 sends a re-invitation request to the VoIP gateway 315 and changes the RTP address and port used by the VoIP gateway 315 so that the VoIP gateway 315 communicates directly with the SIP server 340 . When the SIP server 340 transmits the communication packet to the relay server 330 , the relay server 330 records the address and port of the RTP used by the SIP server 340 . On the other hand, the relay server 330 sends a re-invitation request to the SIP server 340 , and changes the RTP address and port used by the SIP server 340 so that the VoIP gateway 315 communicates directly with the SIP server 340 . Then go to step S480.

In step S480, when the VoIP gateway 315 ends the communication with the SIP server 340, the VoIP gateway 315 transmits a communication termination request to the relay server 330, and the relay server 330 records the communication data such as the time of ending the communication channel for further Authenticate and manage the VoIP gateway 315 . Then go to step S490.

In step S490 , the relay server 330 sends the end communication request to the SIP server 340 , ends the communication channel, and processes the communication data of establishing the communication channel and ending the communication channel to authenticate and manage the VoIP gateway 315 . The processing can be, for example, calculating the time of establishing the communication channel and the time of terminating the communication channel, so as to calculate the communication fee, etc., but it is not limited thereto.

In the above-mentioned embodiment, the IP PBX and the VoIP gateway can be collectively referred to as the client, and the backbone between the relay server setting and the IP PBX and the VoIP gateway registering with the relay server can be collectively referred to as the relay server establishing and connection between clients.

Third embodiment:

Please refer to FIG. 5 , which is a system architecture diagram of a third embodiment of a communication system 500 using SIP multiple registration according to the present invention. The main difference between this embodiment and the first and second embodiments is that this embodiment does not have a NAT server and routing table. In this embodiment, the main application environment and steps are the same as those in the first and second embodiments, so the same parts will not be repeated here.

As shown in FIG. 5 , the system 500 of multiple registration using the session initiation protocol of the present invention is built on the Internet, including a relay server 530 and a plurality of SIP servers 540, wherein the relay server 530 is connected to the client 510, and the The relay server 530 has a recording table 535 and a dialing table 538 . A plurality of SIP servers 540 are connected to the relay server 530 . In addition, the numbers of the clients 510 and the SIP servers 540 in this embodiment are just examples, and in different embodiments of the present invention, the numbers of the clients 510 and the SIP servers 540 are not limited thereto.

In addition, the system 500 of the present invention may optionally include a server 550 with LDAP, and the server 550 with LDAP is connected to the relay server 530 for account and password management.

Furthermore, in the system 500 of the present invention, the called number terminal 560 may optionally be included to connect with the SIP server 540 to transmit communication packets. In this embodiment, the called number terminal 560 and the SIP server 540 The connection relationship is only for illustration, and in different embodiments of the present invention, the called number terminal 560 can be connected with other SIP servers 540 .

Please refer to FIG. 6 , which is a flowchart of a third embodiment of a communication method 600 using multiple registrations of the Session Initiation Protocol according to the present invention, wherein the client 510, the relay server 530, and the SIP server 540 perform the following configurations: step.

As shown in FIG. 6 , in step S610 , a relay server 530 and multiple SIP servers 540 are provided on the Internet, wherein the relay server 530 is connected to the client 510 and the multiple SIP servers 540 respectively. Then go to step S620.

In step S620, the relay server 530 establishes a connection with the client 510, and the relay server 530 registers with a plurality of SIP servers 540, wherein the plurality of SIP servers 540 check the registered account number and/or password, And the result of whether to allow the registration is sent to the relay server 530 . If allowed, then send permission to register, and proceed to step S625; if not allowed, then send reject registration request, and end this procedure.

In step S625 , the relay server 530 monitors whether there is a communication request sent to the relay server 530 . If yes, proceed to step S630; if not, continue to execute step S625.

In step S630, when the client 510 uses SIP to transmit the communication request to the relay server 530, the relay server 530 uses the dial table 538 to select at least one of the plurality of SIP servers 540, preferably, the relay server 530 At least one of the plurality of SIP servers 540 is selected according to the corresponding relationship between the SIP server 540 in the dial table 538 and the dialing number of the client 510 . Then proceed to step S635.

In step S635 , the relay server 530 transmits the communication request to the selected SIP server 540 . Then go to step S640.

In step S640, the SIP server 540 checks the content of the SIP packet, wherein checking the content of the SIP packet includes checking the address and port, account, domain of the SIP, called number and/or the maximum number of simultaneous calls. Then proceed to step S650.

In step S650, the SIP server 540 judges whether to allow the communication request based on the inspection result, and after confirming that the communication status of the called number terminal 560 is normal, the result of whether to allow the communication request is sent to the client via the relay server 530 Terminal 510. If the communication request is allowed, go to step S660; if the communication request is not allowed, go to step S655.

In step S655, the SIP server 540 responds to the client 510 through the relay server 530 that the communication request is not allowed, and ends the communication request, and then returns to step S625. In addition, in different embodiments of the present invention, after the communication request is terminated, the program can also be selectively terminated directly.

In step S660, the SIP server 540 responds to the client 510 through the relay server 530 to allow the communication request, and the relay server 530 establishes a communication channel with the client 510, and the relay server 530 selects to use the corresponding SIP server 540. account and establish a communication channel with the SIP server 540 to transmit the communication packet to the called number terminal 560 connected to the corresponding SIP server 540, and the relay server 530 records communication data such as the time of establishing the communication channel to further authenticate and Management client 510 . Then proceed to step S670.

In step S670 , when the client 510 transmits the communication packet to the relay server 530 , the relay server 530 records the address and port of the RTP used by the client 510 . On the other hand, the relay server 530 sends a re-invitation request to the client 510 and changes the RTP address and port used by the client 510 so that the client 510 communicates directly with the SIP server 540 . When the SIP server 540 transmits the communication packet to the relay server 530 , the relay server 530 records the address and port of the RTP used by the SIP server 540 . On the other hand, the relay server 530 sends a re-invitation request to the SIP server 540 and changes the RTP address and port used by the SIP server 540 so that the client 510 communicates directly with the SIP server 540 . Then go to step S680.

In step S680, when the client 510 ends the communication with the SIP server 540, the client 510 transmits a communication end request to the relay server 530, and the relay server 530 records the communication data such as the time of ending the communication channel, so as to further authenticate and communicate with the SIP server. Management client 510 . Then go to step S690.

In step S690 , the relay server 530 sends the end communication request to the SIP server 540 to end the communication channel, and process the communication data of establishing the communication channel and ending the communication channel to authenticate and manage the client 510 . The processing can be, for example, calculating the time of establishing the communication channel and the time of terminating the communication channel, so as to calculate the communication fee, etc., but it is not limited thereto.

For example, please refer to FIG. 5 again. If the client 510 wants to make an indoor call, such as 0212345678, to the called number terminal 560, then when the communication request is sent to the relay server 530, the relay server 530 uses the number in the dial table 538. The corresponding relationship between the SIP server 540 and the dialing number of the client 510 selects the SIP server 540 with a lower communication fee. Similarly, if the client 510 wants to dial a mobile phone, such as 0912345678, to the called number 560, then when the communication request is sent to the relay server 530, the relay server 530 uses the SIP server 540 in the dial table 538 to contact the client 510 The corresponding relationship between the dialed numbers selects the SIP server 540 with relatively low communication costs. Therefore, the dial table in the relay server can provide a SIP server with lower communication cost for different dial numbers, so as to save the communication cost of the client. In summary, the present invention utilizes the relay server to establish a connection with the client on the one hand, and registers with multiple SIP servers on the other hand, so that the client can communicate with the selected SIP server by selecting at least one of the multiple SIP servers. SIP server direct communication. In this way, the problem of poor compatibility between the SIP server and the client and between SIP servers is solved, and a solution for saving communication costs can be provided for different dial numbers of the client.

The above-mentioned embodiments are only illustrative to illustrate the principles and functions of the present invention, and are not intended to limit the present invention. Anyone skilled in the art can modify and change the above-mentioned embodiments without departing from the spirit and scope of the present invention. In addition, the number of components in the above embodiments is only for illustration, and is not intended to limit the present invention. Therefore, the protection scope of the present invention should be listed in the claims.

Claims (30)

1. A communication method using multiple registrations of the Session Initiation Protocol, characterized in that: Make the relay server establish a connection with the client; causing the relay server to register with a plurality of session initiation protocol servers; causing the client to send a communication request to the relay server using a session initiation protocol; causing the relay server to select at least one of the plurality of SIP servers, and transmit the communication request to the selected SIP server; and After the SIP server checks the packet content of the SIP, it judges whether to allow the communication request, and transmits the judgment result to the client via the relay server. 2. The communication method using multiple registration of session initiation protocol according to claim 1, characterized in that, the client is built on the Internet, the relay server is built on the Internet and connected to the client, and the multiple A session initiation protocol server is built on the Internet and connected with the relay server. 3. The communication method using multiple registrations of SIP as claimed in claim 1, wherein the relay server uses a dial table to select at least one of the plurality of SIP servers. 4. The communication method using multiple registrations of SIP according to claim 3, characterized in that, the relay server selects according to the corresponding relationship between the SIP server and the dialing number of the client in the dialing table. At least one of the plurality of SIP servers. 5 . The communication method of multiple registrations using SIP as claimed in claim 1 , wherein the client uses the SIP to transmit the communication request to the relay server through the NAT server. 6 . 6. The communication method of multiple registrations using the Session Initiation Protocol according to claim 5, wherein when the client uses the Session Initiation Protocol to transmit the communication request to the relay server through the NAT server, Instructing the relay server to change the packet content of the SIP. 7. The communication method for multiple registrations using the Session Initiation Protocol according to claim 6, wherein the change of the packet content of the Session Initiation Protocol is to obtain the source of the header of the Session Initiation Protocol in the packet content from the The address and port before conversion by the NAT server are changed to the address and port of the relay server. 8. The communication method for multiple registrations using the Session Initiation Protocol according to claim 1, further comprising: When the SIP server allows the communication request, the SIP server responds to the client through the relay server to allow the communication request, and the relay server establishes a communication channel with the client, and The relay server is made to choose to use the account corresponding to the SIP server and establish a communication channel with the SIP server. 9. The communication method for multiple registrations using the Session Initiation Protocol according to claim 8, further comprising: When the client ends the communication with the SIP server, the client sends a communication end request to the relay server; causing the relay server to send the end communication request to the SIP server; and Instruct the relay server to end the communication channel. 10 . The communication method using multiple registrations of the Session Initiation Protocol according to claim 9 , wherein the relay server is made to record the communication data of establishing the communication channel and terminating the communication channel. 11 . 11. The communication method using multiple registrations of the Session Initiation Protocol according to claim 10, wherein the communication data is communication time. 12. The communication method for multiple registrations using the Session Initiation Protocol according to claim 1, further comprising: When the SIP server does not allow the result of the communication request, the SIP server responds to the client through the relay server that the communication request is not allowed, and ends the communication request. 13. The communication method using multiple registration of SIP according to claim 1, characterized in that, when the relay server registers with the SIP server, the SIP server is ordered to check the registered account number and /or password, and whether to allow the result of the registration to be sent to the relay server. 14. The communication method using multiple registration of SIP according to claim 1, characterized in that, the SIP server checks the package content of the SIP including checking the address and port, account number, and the SIP Domain, called number and/or maximum number of simultaneous calls. 15. The communication method for multiple registrations using the Session Initiation Protocol according to claim 14, further comprising: When the client transmits a communication packet to the relay server, causing the relay server to record the address and port of the real-time transport protocol used by the client; and Make the relay server send a re-invitation request to the client, and change the address and port of the real-time transport protocol used by the client, so that the client communicates directly with the SIP server. 16. The communication method for multiple registrations using the Session Initiation Protocol according to claim 15, further comprising: When the SIP server transmits the communication packet to the relay server, causing the relay server to record the address and port of the RTP used by the SIP server; and The relay server sends a re-invitation request to the SIP server, and changes the RTP address and port used by the SIP server, so that the client communicates directly with the SIP server. 17. The communication method using multiple registrations of the Session Initiation Protocol according to claim 1, wherein the client is an Internet telephony gateway and/or an IP subscriber exchange. 18. The communication method using multiple registrations of SIP according to claim 17, characterized in that, when the client is an Internet telephony gateway, the relay server establishes a connection with the client by ordering The client registers with the relay server. 19. The communication method using multiple registrations of the Session Initiation Protocol according to claim 17, wherein when the client is an IP PBX, the relay server establishes a connection with the client to make the The relay server sets up the backbone with the client. 20. The communication method using multiple registration of SIP as claimed in claim 1, wherein the SIP server is a multimedia communication server. 21. A communication system using multiple registrations of session initiation protocol, characterized in that it comprises: The relay server is built on the Internet and connected with the client through the Internet; and A plurality of session initiation protocol servers are constructed on the Internet and connected to the relay server, Wherein, the relay server establishes the connection with the client through the configuration method, and the relay server registers with the plurality of session initiation protocol servers through the configuration method, and the client uses the configuration method to use The session initiation protocol transmits the communication request to the relay server, the relay server selects at least one of the plurality of session initiation protocol servers and transmits the communication request to the selected session initiation protocol server, and the session initiation protocol server After checking the package content of the session initiation protocol through the configuration method, it is judged whether to allow the communication request, and the judgment result is sent to the client terminal via the relay server. 22. The communication system using multiple registration of session initiation protocol according to claim 21, further comprising: A network address translation server, configured on the Internet and connected to the client, and connected to the relay server, wherein the client uses the session initiation protocol to pass the communication request through the network address translation server in a configuration manner sent to the relay server. 23. The multi-registration communication system using Session Initiation Protocol according to claim 21, wherein the client is at least one of a VoIP gateway and/or an IP subscriber exchange. 24. The communication system using multiple registrations of SIP as claimed in claim 21, wherein the SIP server is a multimedia communication server. 25. The communication system using multiple registrations of the Session Initiation Protocol according to claim 22, wherein the relay server changes the packet content of the Session Initiation Protocol through configuration. 26. The communication system using multiple registrations of the Session Initiation Protocol according to claim 25, wherein the relay server changes the packet content of the Session Initiation Protocol through a configuration method, such that the packet content in the packet content The source of the SIP header is changed from the address and port before being translated by the NAT server to the address and port of the relay server. 27. The communication system using multiple registrations of the Session Initiation Protocol according to claim 21, further comprising: A server with a light directory access protocol is built on the Internet and connected to the relay server to manage account numbers and passwords. 28. The communication system using multiple registrations of SIP as claimed in claim 21, wherein the relay server has a recording table for recording communication data between the client and the SIP server. 29. The communication system using multiple registrations of SIP according to claim 28, wherein the recording table is used to record the communication time between the client and the SIP server. 30. The communication system using multiple registrations of SIP according to claim 21, wherein the relay server has a dial table for recording the corresponding relationship between the SIP server and the dialing numbers of the client .

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