CN1917513A - Communication system, proxy server, and communication method - Google Patents
Communication system, proxy server, and communication method Download PDFInfo
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- CN1917513A CN1917513A CNA2005100932327A CN200510093232A CN1917513A CN 1917513 A CN1917513 A CN 1917513A CN A2005100932327 A CNA2005100932327 A CN A2005100932327A CN 200510093232 A CN200510093232 A CN 200510093232A CN 1917513 A CN1917513 A CN 1917513A
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Abstract
The system thereof comprises a first user end, a proxy server and a second user end. The proxy server is used to relay the request for building communication from the first user end to the second user end, and to relay the response of building communication from the second user end to the first user end. Wherein, the proxy server comprises: an address modification unit for modifying the user end address in the request for building communication from first user end into an address appointed by the proxy server, and for modifying the second user end address in the response of building communication from the second user end to an address appointed by the proxy server; and an address/port distributor for distributing the address/port to the communication between the first user end and second user end.
Description
Technical field
The present invention relates to a kind of communication system, acting server and communication means, particularly communication system, acting server and the communication means of use Session Initiation Protocol.
Background technology
SIP (session initiation protocol) is an application controls (signaling) agreement that is put forward by IETF, and its most recent protocol version is RFC3261 at present.The Multimedia session process that it can be used to create, revise and a plurality of participants that terminate participate in.The member who participates in session can communicate by the form of multicast mode, clean culture networking or both combinations.
The branch that client-server is arranged among the SIP.Client computer is meant the application program that connects with server in order to send request to server.Contain client computer among user agent (User Agent) and the agency (Proxy).Server is the application program that is used for providing to the request that client computer is sent service and return response.Have four class base server:
Subscriber proxy server: its contact user when receiving the SIP request, and representative of consumer is returned response.
Acting server: represent other client computer to initiate request, not only served as server but also served as the media program of client computer.Before the request of transmitting, it can rewrite the content in the former request message.
Redirect Server: it receives the SIP request, and the raw address in the request is mapped to zero or a plurality of new address, returns to client computer.
Registrar: the register requirement of its subscribing client, finish the registration of station address.The user terminal program often needs to comprise user agent client and subscriber proxy server.Acting server, Redirect Server and registrar are the webserver of public character as can be seen.In SIP, also often mention the notion of location-server, but location-server does not belong to the SIP service.
SIP has taken into full account the exaptation to other agreement in design.It supports many kinds of address descriptors and addressing, comprises user name @ host address: Bei Jiaohaoma @PSTN gateway address: the description of Tel:010-62281234 plain old telephone etc.Like this, the SIP caller just can identify called in the online position of black phone according to called address, initiates and sets up and call out by a gateway that links to each other with the traditional electrical phone network then.The most powerful part of SIP is exactly a subscriber location function.SIP itself contains the function of oriented registrar registration, and the positioning service that also can utilize other location-server DNS, LDAP etc. to provide strengthens its positioning function.
SIP has stipulated six kinds of signaling: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER altogether.Wherein INVITE and ACK are used for setting up calling, finish three-way handshake, change session attribute after perhaps being used to set up; BYE is in order to end session; OPTIONS is used for the querying server ability; CANCEL is used to cancel the request of having sent but finally having finished; REGISTER is used for the client and goes out to message such as registrar registered user positions.
With reference to Fig. 1, the flow process of the communication means of prior art is described, it comprises the steps.
S101, user A registers to acting server.
S102, acting server is preserved the information of user A.
S103, user A sends Invite message to acting server, and request is communicated by letter with user B.Invite message comprises local user URL address (the From field of sip message), purpose user's URL address (To field), local user's actual address (Contact).Simultaneously for the SDP message semantic definition of the bind mode description how to be connected by Invite message inside with the purpose user.
After S104, acting server receive this message, check that at first whether purpose user B is at local domain.If in this locality, then proceed to S106, this acting server is transmitted Invite and is asked the B to the user.If not in this locality, then proceed to S105, be transmitted to other acting server.
S107, user B response Invite message is fed back 200 OK message and is given acting server.After targeted customer B receives Invite message, will write down the station address of Contact field in the Invite message, use for end-to-end communication in the future.Simultaneously, user B can be placed on the current address of oneself in the Contact field of the 200 OK message of receiveing the response of Invite message.
S108, acting server is given user A with the 200OK forwards.
S109, after SIP called out the two sides acquisition the other side's who initiates true address, the user can set up end to end and connect, and then user after this will communicate by letter and will be controlled by user program.
Any SIP server device comprises that acting server, registrar, Redirect Server can't intervene the communication process between the user.This provides SIP service for enterprise or operator, and very disadvantageous during the application scenarios that need monitor user's operation.In enterprises, the user has unique interior net address mostly in the inside of fire compartment wall, is connecting when outside, home address and enterprise agential server address and port need be shone upon, and present SIP scheme can't head it off.
Simultaneously, user's home address is exposed to the targeted customer, targeted customer's address also directly offers internal user, this needs the environment of higher-security for some is to be not suitable for, under this condition, remote subscriber can be understood inner route of inner user and DNS naming rule by the SIP handshake procedure.
Summary of the invention
The communication system that the object of the present invention is to provide a kind of communicating pair can not obtain partner address and be easy to monitor, acting server and communication means.
An aspect of of the present present invention is to provide a kind of communication system, it comprises first user side, one acts on behalf of the server and second user side, this acting server is used for the communication request of setting up from first user side is transferred to second user side, to set up response from the communication of second user side and transfer to first user side, described communication is set up response and is set up request responding for described communication, wherein, described acting server, comprise an address modification portion, be used for and set up the address that this acting server appointment is revised as in the first user side address of request from the communication of first user side, will set up the address that this acting server appointment is revised as in the address of second user side in the response from the communication of second user side; And one address to distributor, be used to the application communication between first user side and second user side to distribute address right.
Another aspect of the present invention is to provide a kind of acting server, it is used for setting up communication between first user side and second user side, this agency's reason server will transfer to second user side from the communication request of setting up of first user side, to set up response from the communication of second user side and transfer to first user side, described communication is set up response and is set up request responding for described communication, wherein, described acting server, comprise an address modification portion, be used for and set up the address that this acting server appointment is revised as in the first user side address of request from the communication of first user side, will set up the address that this acting server appointment is revised as in the address of second user side in the response from the communication of second user side; And one address to distributor, be used to the application communication between first user side and second user side to distribute address right.
Another aspect of the present invention is to provide a kind of communication means, is used for setting up communication between first user side and second user side, and it comprises: first user side will be communicated by letter and be set up the step of asking to be sent to coupled acting server; The acting server address that this acting server appointment is revised as in the address of first user side in the request of setting up of will communicating by letter, be second user side when distributing its application communication used address right, and the amended communication request of setting up is sent to the step of second user side; Second user side responds this communication and sets up request, and the step that response is sent to described acting server is set up in communication; The described acting server address that this acting server appointment is revised as in the address of setting up second user side in the response of will communicating by letter, be first user side when distributing its application communication used address right, and amended communication set up the step that response is sent to first user side; And first user side and second user side utilize addresses distributed/port to setting up the step of communicating by letter.
According to the present invention, by the address that the station address that will be comprised in the message is revised as the acting server appointment, the neither address information that can obtain the other side of communicating pair.In addition, by being address and the port that first user side and second user side use when distributing its application communication, communicating pair can connect carrying out logic by addresses distributed/port, can realize monitoring well.
Description of drawings
Fig. 1 is the flow chart of the communication means of prior art.
Fig. 2 is the block diagram according to the communication system of an embodiment of the present invention.
Fig. 3 is the structured flowchart according to acting server A 23 of the present invention.
Fig. 4 is the flow chart according to communication means of the present invention.
Fig. 5 revises the flow chart of Invite message for acting server.
Fig. 6 revises the flow chart of 200 OK message for acting server.
Embodiment
As shown in Figure 2, the communication system according to an embodiment of the present invention comprises sip terminal A 21, acting server A 23, acting server B 24 and sip terminal B 22.User A uses sip terminal A 21, and user B uses sip terminal B 22.In acting server A 23, store the user profile of user A registration.
User A sends Invite message by sip terminal A 21 to acting server A 23, and request is communicated by letter with user B.Acting server A 23 revises Invite message, and amended Invite message is transmitted to sip terminal B 22 by acting server B 24.Sip terminal B 22 these Invite message of response are given acting server B 24 with 200 OK message feedback, and this acting server B24 gives acting server A23 with this 200 OK forwards.Acting server A23 revises this 200OK message, and amended 200 OK message are sent to sip terminal A 21.Then, sip terminal A 21 carries out logic with sip terminal B 22 by application server A 25 and is connected.
As shown in Figure 3, acting server A 23 comprises an address modification portion 231, and application server address/port is to a distributor 232 and an inspection portion 233.When acting on behalf of server A 23 and receive Invite message from sip terminal A 21, From field and Contact field that the Invite message are revised by the address modification portion 231 of acting server A 23 are the address of acting server A 23 appointments.This address by a URI go here and there (unified resource sign word string) expression, address format is " a user name host address ", amended user name is constant, host address changes the given host address into.This host address can be identical with proxy server address.Application server address/port of acting on behalf of server A 23 is simultaneously revised the session owner that the SDP of these message describes to distributor 232 and is described part, the address that makes its sensing is the address of application server 25, the port address that the application communication that also can remap as required simultaneously connects.This amended Invite message sends to inspection portion 232.This inspection portion 233 checks that whether purpose user B is in its this locality.If in its this locality, then this acting server 23 directly sends to sip terminal B22 with this message.If not in its this locality, then should amended Invite forwards jump acting server to next.In the present embodiment, acting server A 23 is checked through purpose user B not in its this locality, gives acting server B 24 with amended Invite forwards, by acting server B 24 this message is sent to sip terminal B22.In the present invention, other acting server except that acting server A 23 only has forwarding capability, and does not revise the function of Invite message or 200 OK message.These acting servers all have an inspection portion, and its 26S Proteasome Structure and Function is identical with the inspection portion 233 among the acting server A 23.
The Invite message of sip terminal B 22 these receptions of response sends to acting server A 23 with 200 OK message by acting server B 24.The address modification portion 231 of acting server A 23 revise the 200OK message with the Contact field be the address of acting server appointment.This address by a URI go here and there (unified resource sign word string) expression, address format is " a user name host address ", amended user name is constant, host address changes the given host address into.This host address can be identical with proxy server address.Application server address/port of acting on behalf of server A 23 is simultaneously revised the session owner that the SDP of these message describes to distributor 232 and is described part, make its address of pointing to application server 25, the port address that the application communication that also can remap as required simultaneously connects.Because purpose user A is in this locality of this acting server A 23, then this acting server A 23 directly should amended 200 OK message send to sip terminal A.In addition, this acting server A 23 also has the device (figure does not show) that will be included in the address of the sip terminal B 22 in the 200 OK information and routing information (the being the via field) buffer memory that 200 OK information are passed through.The address of the sip terminal B 22 of this buffer memory is used to hang up the connection between sip terminal A21 and the sip terminal B22, and the via field of buffer memory is used for other application relevant with Session Initiation Protocol.
Below, provided Invite message, amended Invite message, 200 OK message, an example of amended 200 OK message.
Invite message:
INVITE?sip:userb@abc.com?SIP/2.0
Max-Forwards:70
To:Bob<sip:userb@abc.com>
From:Alice<sip:usera@lenovo.com>;tag=1928301774
Call-ID:a84b4c76e66710
CSeq:314159?INVITE
Contact:<sip:usera@lenovo.com>
Content-Type:application/sdp
Content-Length:142
v=0
o=alice?2890844526?2890842807?IN?IP4?126.16.64.4
t=2873397496?2873404696
a=recvonly
m=audio?49170?RTP/AVP?0
Amended Invite message:
INVITE?sip:userb@abc.com?SIP/2.0
Max-Forwards:70
To:Bob<sip:userb@abc.com>
From:Alice<sip:usera@proxya.com>;tag=1928301774
Call-ID:a84b4c76e66710
CSeq:314159?INVITE
Contact:<sip:usera@lcr.proxya.com:1234>
Content-Type:application/sdp
Content-Length:142
v=0
o=alice?2890844526?2890842807?IN?IP4?220.120.10.4
t=2873397496?2873404696
a=recvonly
m=audio?1000?RTP/AVP?0
200 OK message:
SIP/2.0?200?OK
Via:SIP/2.0/UDP?serverl.abc.com
;branch=z9hG4bKnashds8;received=192.0.2.3
Via:SIP/2.0/UDP?server2.proxya.com
;branch=z9hG4bK77ef4c2312983.1;received=192.0.2.2
To:Bob<sip:userb@abc.com>;tag=a6c85cf
From:Alice<sip:usera@proxya.com>;tag=1928301774
Call-ID:a84b4c76e66710
CSeq:314159INVITE
Contact:<sip:userb@192.0.2.4>
Content-Type:application/sdp
Content-Length:131
v=0
o=bob?2890844526?2890842807?IN?IP4?192.0.2.4
t=2873397496?2873404696
a=recvonly
m=audio?20000?RTP/AVP?0
Amended 200 OK message
SIP/2.0?200?OK
To:Bob<sip:userb@abc.com>;tag=a6c85cf
From:Alice<sip:usera@proxya.com>;tag=1928301774
Call-ID:a84b4c76e66710
CSeq:314159?INVITE
Contact:<sip:userb@lcr.proxya.com:2346>
Content-Type:application/sdp
Content-Length:131
v=0
o=bob?2890844526?2890842807?IN?IP4?220.120.10.4
t=2873397496?2873404696
a=recvonly
m=audio?20000?RTP/AVP?0
As can be seen from the above, acting server A 23 is revised as the URL address " proxya.com " of acting server A23 and the actual address " lcr.proxya.com:1234 " of acting server A23 respectively with the actual address " lenovo.com " of user URL address " lenovo.com " in the From field of Invite message and the user A in the Contact field.In addition, amended Invite message comprises the address (220.120.10.4) and the port (1000) of the application server 25 when being used for application communication between user A and the user B, and it is included in respectively in o field and the m field.
Acting server A 23 is revised as the actual address " 192.0.2.4 " of the user B in the Contact field of 200 OK message respectively URL address " proxya.com " and the application server actual address " lcr.proxya.com:2346 " of acting server A 23.In addition, amended 200 OK message comprise address (220.120.10.4) and the port (2000) when being used for application communication between user A and the user B, and it is included in respectively in o field and the m field.
User A and user B can be by being included in Invite message and 200 OK message the o field and the information in the m field, set up logic by application server 25 and connect.
In the present invention, application server 25 can be the equipment that is independent of acting server, also can be exactly that acting server A 23 is own.
In the above embodiments, this communication system comprises two acting servers, i.e. acting server A23 and acting server B24.But,, then do not need acting server B 24, and the inspection portion 233 among the acting server A23 can omit also if this communication system is used for communicating by letter between same user A that acts on behalf of server A 23 this locality and user B.Certainly, also can have more acting server, be used for transmitting message.
Compared with prior art, in this communication system, by the address that the station address that will be comprised in the message is revised as the acting server appointment, the neither address information that can obtain communication counterpart of user A or user B.The address and the port that use when distributing its application communication for user A and user B, user A carries out logic with user B by application server 25 and is connected, can realize well functions such as the user charges to provide, service quality assurance are provided.And the present invention need not change the working method of existing Session Initiation Protocol, does not increase new service signaling yet, only needs acting server is carried out certain expansion.
Below, describe according to communication means of the present invention.
As shown in Figure 4, comprise the steps according to communication means of the present invention.
S401, user A registers to acting server A 23 by sip terminal A 21.
S402, the information that acting server A 23 preserves user A.
S403, user A sends Invite message by sip terminal A to acting server A 23, and request is communicated by letter with user B.
S404, acting server A 23 revise the Invite request of user A.
S405, acting server check that whether purpose user B is in this locality.If user B in this locality, then proceeds to step S407.If user B not in this locality, then proceeds to step S406, promptly this acting server is transmitted to next with this Invite request and jumps acting server.Receive next jumping acting server repeating step S405 of this Invite request, until finding user B to be positioned at local acting server.
S407, acting server is given user B with amended Invite forwards.
S408, user B will feed back 200 OK message by other acting server and give acting server A 23.
S409, acting server A 23 revises 200 OK message, and gives sip terminal A 21 with amended 200 OK message.
S410, the logic of setting up between sip terminal A 21 and the sip terminal B 22 connects.
As shown in Figure 5, the flow chart that it has described acting server A 23 modification Invite message comprises the steps.
S501, acting server A 23 receives Invite message from sip terminal A.
S502, acting server A 23 revises the Contact field and the From field of Invite message, is about to the address that acting server A 23 appointments are revised as in the address of user A.
S503, acting server A 23 checks whether application server 25 supports the media type field (m=) of SDP.If support, then proceed to step S504.If do not support, then finish.
S504, for the address of application communication distributing application servers 25 is right, this addresses distributed/port employed address when being user B application communication is right.
S505, acting server A 23 revises session ower field (o=) and the media type field (m=) of the SDP of Invite message, and these two fields are revised as respectively that to be included among the step S504 addresses distributed/port right.
As shown in Figure 6, the flow chart that it has described acting server A 23 modifications 200 OK message comprises the steps.
S601, acting server A 23 buffer memorys are included in the user B address in the 200 OK message.
S602, acting server A 23 revises the Contact field field in the 200 OK message, is about to the address that acting server A 23 appointments are revised as in the address of user B.
S603, acting server A 23 checks whether application server 25 supports the media type field (m=) of SDP.If support, then proceed to step S604.If do not support, then finish.
S604, for the address of application communication distributing application servers 25 is right, this addresses distributed/port employed address when being user A application communication is right.
S605, acting server A 23 revises session ower field (o=) and the media type field (m=) of SDP, and these two fields are revised as respectively that to be included among the step S504 addresses distributed/port right.
S606, the Via field of acting server A 23 buffer memorys 200 OK message comprises the information in the path that 200 OK message are passed through in field.
S607, acting server A 23 transmits amended 200 OK and gives sip terminal A 21.
In the present invention, have no requirement for sip terminal equipment, the simplest realization only needs to revise sip proxy server, realizes the monitoring that end-to-end SIP is connected.When carrying out service monitoring, the system manager only need be provided with that rule of communication gets final product between the port of application server.The SIP service provider can be carried out user's charging easily, work such as flow control and service quality assurance.
Consider the needs of extensive operation, to subscriber information management the time, can use light weight catalog access visit server or database server to finish, this server directly links to each other with acting server.The application service address that communication is set and port to the time, can integrate with existing Network address translators technology, fire compartment wall or route technology, so that the solution that satisfies the operation needs to be provided.In the soft phone and IP-PBX enterprise applied environment based on SIP of exploitation at present, use this invention that sip proxy server has been carried out relevant function expansion, realized the monitoring of conversing between the enterprises SIP phone having realized functions such as calling timing and call record.
Claims (20)
1. communication system, it comprises first user side, one acts on behalf of the server and second user side, this acting server is used for the communication request of setting up from first user side is transferred to second user side, to set up response from the communication of second user side and transfer to first user side, described communication is set up response and is set up request responding for described communication, wherein
Described acting server, comprise an address modification portion, be used for and set up the address that this acting server appointment is revised as in the first user side address of request from the communication of first user side, will set up the address that this acting server appointment is revised as in the address of second user side in the response from the communication of second user side; And one address to distributor, be used to the application communication between first user side and second user side to distribute address right.
2. communication system as claimed in claim 1, wherein,
Described communication system is based on the communication system of session initiation protocol.
3. communication system as claimed in claim 1 or 2, wherein,
Store the information of first user side in the described acting server.
4. communication system as claimed in claim 1 or 2, wherein,
Described address is right to distributor addresses distributed/port address of employed application server when being first user side and the second user side application communication.
5. communication system as claimed in claim 1 or 2, wherein,
Described address to distributor addresses distributed/port to being that the address of this acting server is right.
6. communication system as claimed in claim 1 or 2, wherein,
Described acting server further comprises: will be included in communication and set up the address of second user side in the response and the device of the routing information buffer memory that communication foundation response is passed through.
7. communication system as claimed in claim 1 or 2, it further comprises a plurality of other acting servers, wherein,
Each acting server all comprises an inspection portion, whether is used to check the purpose user side in this locality of this acting server, when not being when it is local, the communication foundation of reception is asked or communicate by letter with setting up to respond the acting server that is transmitted to other.
8. acting server, it is used for setting up communication between first user side and second user side, this agency's reason server will transfer to second user side from the communication request of setting up of first user side, to set up response from the communication of second user side and transfer to first user side, described communication is set up response and is set up request responding for described communication, wherein
Described acting server, comprise an address modification portion, be used for and set up the address that this acting server appointment is revised as in the first user side address of request from the communication of first user side, will set up the address that this acting server appointment is revised as in the address of second user side in the response from the communication of second user side; And
One address is used to the application communication between first user side and second user side to distribute address right to distributor.
9. acting server as claimed in claim 8, wherein,
This proxy server stores has the information of first user side.
10. acting server as claimed in claim 8, wherein,
Described address is right to distributor addresses distributed/port address of employed application server when being first user side and the second user side application communication.
11. acting server as claimed in claim 8, wherein,
Described address to distributor addresses distributed/port to being that the address of this acting server is right.
12. acting server as claimed in claim 8, wherein,
Described acting server further comprises: will be included in communication and set up the address of second user side in the response and the device of the routing information buffer memory that communication foundation response is passed through.
13. communication system as claimed in claim 8, it further comprises an inspection portion, whether is used to check the purpose user side in this locality of this acting server, when not being when it is local, the communication request of setting up that receives is transmitted to other acting server.
14. a communication means is used for setting up communication between first user side and second user side, it comprises:
First user side will be communicated by letter and be set up the step of asking to be sent to coupled acting server;
The acting server address that this acting server appointment is revised as in the address of first user side in the request of setting up of will communicating by letter, be second user side when distributing its application communication used address right, and the amended communication request of setting up is sent to the step of second user side;
Second user side responds this communication and sets up request, and the step that response is sent to described acting server is set up in communication;
The described acting server address that this acting server appointment is revised as in the address of setting up second user side in the response of will communicating by letter, be first user side when distributing its application communication used address right, and amended communication set up the step that response is sent to first user side; And
First user side utilizes addresses distributed/port to setting up the step of communicating by letter with second user side.
15. communication means as claimed in claim 14, wherein
This communication means use session initiation protocol is set up the communication between first user side and second user side.
16. as claim 14 or 15 described communication meanss, wherein,
Institute's addresses distributed/port address of employed application server when being first user side and the second user side application communication is right.
17. as claim 14 or 15 described communication meanss, wherein,
Institute's addresses distributed/port is to being that the address of this acting server is right.
18. as claim 14 or 15 described communication meanss, it further comprises
First user side to the registration of this acting server, and this acting server is preserved the step of the information of this first user side.
19. as claim 14 or 15 described communication meanss, it further comprises
Whether described acting server checks the purpose user side in this locality, if the purpose user side not when it is local, is transmitted to the information that receives by other acting server the step of purpose user side.
20. as claim 14 or 15 described communication meanss, it further comprises
Acting server will be communicated by letter and be set up the foundation of communicate by letter with this of the second user side address in the response and respond the step of the routing information buffer memory that is passed through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100932327A CN1917513A (en) | 2005-08-19 | 2005-08-19 | Communication system, proxy server, and communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100932327A CN1917513A (en) | 2005-08-19 | 2005-08-19 | Communication system, proxy server, and communication method |
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| CN1917513A true CN1917513A (en) | 2007-02-21 |
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| CNA2005100932327A Pending CN1917513A (en) | 2005-08-19 | 2005-08-19 | Communication system, proxy server, and communication method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796414A (en) * | 2015-04-03 | 2015-07-22 | 陕西天隆泰信息技术有限公司 | Network interconnection call system and call method thereof |
| CN107079057A (en) * | 2016-12-14 | 2017-08-18 | 深圳前海达闼云端智能科技有限公司 | Data transmission method, device, system, electronic equipment and computer program product |
| CN108810012A (en) * | 2018-07-02 | 2018-11-13 | 北京明朝万达科技股份有限公司 | Communication means based on Session Initiation Protocol and device |
-
2005
- 2005-08-19 CN CNA2005100932327A patent/CN1917513A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796414A (en) * | 2015-04-03 | 2015-07-22 | 陕西天隆泰信息技术有限公司 | Network interconnection call system and call method thereof |
| CN107079057A (en) * | 2016-12-14 | 2017-08-18 | 深圳前海达闼云端智能科技有限公司 | Data transmission method, device, system, electronic equipment and computer program product |
| WO2018107387A1 (en) * | 2016-12-14 | 2018-06-21 | 深圳前海达闼云端智能科技有限公司 | Data transmission method, device, system, electronic device, and computer program product |
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| CN108810012B (en) * | 2018-07-02 | 2020-11-10 | 北京明朝万达科技股份有限公司 | Communication method and device based on SIP protocol |
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