CN101079807A - A mesh relaying method and IP communication system for controlling media transmission path - Google Patents
A mesh relaying method and IP communication system for controlling media transmission path Download PDFInfo
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- CN101079807A CN101079807A CNA2007100119932A CN200710011993A CN101079807A CN 101079807 A CN101079807 A CN 101079807A CN A2007100119932 A CNA2007100119932 A CN A2007100119932A CN 200710011993 A CN200710011993 A CN 200710011993A CN 101079807 A CN101079807 A CN 101079807A
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Abstract
The invention discloses a controlling method of net-shaped relay of media transmitting path and IP communication system, which comprises the following steps: setting one or more media relay translators in the media with public net IP address in the IP communicating system; dividing the media relay translator into different components according to the intercommunicating property; judging the belonged ISP pattern through IP communication system in the registering course of communication terminal; selecting one medial relay translator or combining couple of two media relay translators in the same group in the IP communication control channel intercommunicating establishing course; building media channel through media relay translator for communicating terminal; detaching the media channel for IP communication system after finishing the communication. The system contains database, network pattern detector, order control server, media relay translator and media relay distributor. The invention elevates the IP communication service quality effectively, which has strong constructability, extendibility and load balance mechanism.
Description
Technical field
The present invention relates to a kind of treatment technology of network communication field, thereby specifically a kind ofly control netted trunking method and the IP communication system that the IP telecommunication service quality is improved in the media delivery path by trunking traffic terminal both sides Media Stream.
Background technology
VoIP (Voice over Internet Protocol, Internet Protocol telephone or wideband telephony) new technique based on the Internet is being faced with unprecedented opportunity to develop.VoIP is typical real-time service, QoS (Quality of Service, service quality) is had very high requirement, yet IP network does not provide perfect Qos mechanism, and the service quality of multimedia service can not be protected.The undesirable extensive use that limits voip technology to a great extent of voice quality.
Under present Internet present situation, each ISP (Internet Service Provider, the ISP) interconnect between non-sometimes constant (such as, two different ISP ISP-1 and ISP-2, smaller bandwidth between ISP-1 and the ISP-2, congested serious with packet loss), be not suitable for transmitting the fixing media data of real-time speed.Interconnect and carry out IP (InternetProtocol between the poor ISP user, when interconnection agreement between the network) communicating by letter, if transmit real time data according to the network default route, then be subjected to the influence of bandwidth between the interconnected node of different I SP service network, cause big delay, shake in the medium bag transmission course, even the packet loss phenomenon takes place, service quality is difficult to accept usually.
For making IP network can satisfy the requirement of multimedia service, DiffServ (Differentiated Services), MPLS (Multi-Propocol Label Switching, multi protocol label exchange) etc. technology is employed transforming IP network, but needs the support of IP kernel heart net router, and implementation is poor; A lot of terminals adopt technology such as shake absorption, Discarded Packets compensation to remedy the adverse effect of IP network to real time communication, and the compress speech coding and decoding technology efficiently of designing reduces the requirement to the network bandwidth, to improve communication quality, but need the support of various communication terminals, this is difficult to realize in the prior art.
Summary of the invention
At the problem that the difference that interconnects between the heterogeneous networks service provider in the prior art is brought, the object of the present invention is to provide a kind of netted trunking method and the IP communication system that can control the media delivery path according to the Different Dynamic of communication terminal network ISP of living in type.
In order to solve above-mentioned purpose, the technical scheme that the inventive method adopts is:
In the IP communication system, be provided with one at the most platform have the media relays transponder of public network IP address;
The media relays transponder is divided into different grouping according to interoperability, and the different media relays transponders that belong to same grouping have different ISP and insert;
In the communication terminal registration process, the IP communication system is judged its ISP type that belongs to;
In setting up IP control of communication channel reciprocal process, it is right that the IP communication system is selected a media relays transponder or belonged to the combination of being made up of two media relays transponders of same grouping;
Communication terminal is set up media channel by the media relays transponder;
Behind the sign off, the IP communication system is removed media channel.
Be that the media relays transponder of VPN interconnection that local area network (LAN) or bandwidth can be guaranteed is classified same grouping as the described media relays transponder is divided into groups; The communication terminal registration process of described IP communication system is: communication terminal starts the back and sends register requirement to the IP communication system, and the IP communication system is accepted the register requirement from communication terminal, and according to the ISP type of registering IP address information acquisition communication terminal.
The described step of setting up IP control of communication channel reciprocal process is as follows:
A1. communication initiator is that the caller communication terminal sends communication request to the IP communication system, and the IP communication system is inquired about the ISP type information that obtains in advance according to caller in the communication request and called number;
The A2.IP communication system is according to the ISP type selecting media relays transponder of communication terminal, if communication terminal both sides' ISP type is identical, then selects a media relays transponder with identical ISP type; If communication terminal both sides' ISP type difference, the combination that then preferential two media relays transponders that are consistent with communication terminal both sides ISP type of selecting to belong to same grouping are formed is right, if it is right not satisfy the media relays transponder combination of communication terminal both sides ISP type, can be according to media relays transponder of ISP type selecting of called communication terminal or caller communication terminal;
A3. right if in above-mentioned A2 step, selected the combination of media relays transponder, the IP communication system is that called media relays transponder sends relay request to the media relays transponder identical with called communication terminal ISP type of selected media relays transponder combination centering, and asking called media relays transponder is this allocation of communications address and port; If in the A2 step, only selected a media relays transponder, the IP communication system sends relay request to this media relays transponder, this media relays transponder is this allocation of communications address and port, and relaying response loopback is put into to the IP communication system in above-mentioned address and port;
Address and port during the A4.IP communication system is responded according to relaying are revised Media Stream address and port relevant in the communication request, and amended communication request are sent to called communication terminal;
A5. after called communication terminal determines to accept this communication, reply this communication and loopback communication and reply the IP communication system;
After the communication that the A6.IP communication system receives called communication terminal loopback is replied, if it is right to have selected the combination of media relays transponder in the A2 step, then the media relays transponder identical with caller communication terminal ISP type to selected media relays transponder combination centering is that caller media relays transponder sends relay request, and request caller media relays transponder is this allocation of communications address and port; If in the A2 step, only selected a media relays transponder, then send relay request to this media relays transponder, asking this media relays transponder is this allocation of communications address and port, and above-mentioned address and port are put into relaying respond loopback and give the IP communication system, the IP communication system sends a relaying notice to called media relays transponder simultaneously;
Address and port during the A7.IP communication system is responded according to relaying, revise communication reply in relevant Media Stream address and port, and amended communication replied send to the caller communication terminal;
A8. the caller communication terminal sends communication acknowledgement to the IP communication system, and the IP communication system is transmitted communication acknowledgement to called communication terminal.
After the media relays transponder is chosen,, only accept to come from the real-time communication data bag of expectation address or expectation address field for the communication terminal both sides are provided with expectation address and the expectation address field that sends the real-time communication data bag; The expectation address of described real-time communication data bag is: the entrained Media Stream public network address of control signaling in the address, source of control signaling and/or the communication negotiation process in the communication negotiation process that the IP communication system is received; The expectation address field of real-time communication data bag be with the expectation address before the identical address field of 24 bit binary number.
The step that described media channel is set up process is as follows:
B1. the caller communication terminal is after confirming that control channel is successfully set up, from communication is replied, extract the IP address and the port of the media relays transponder of in steps A 7, being revised by the IP communication system, and send local real-time communication data bag to this IP address and port;
B2. called communication terminal is after confirming that control channel is successfully set up, from communication request, extract the IP address and the port of the media relays transponder of in steps A 4, being revised by the IP communication system, and send local real-time communication data bag to this IP address and port;
B3. if in the A2 step, selected a media relays transponder for this communication, then caller communication terminal and called communication terminal all send to the real-time communication data bag same media relays transponder, the address that receives the real-time communication data bag as this communication terminal noted the source address of the real-time communication data bag that receives by the media relays transponder, receive communication terminal both sides' real-time communication data bag when the media relays transponder after, can transmit the real-time communication data bag to distant terminal; If selected the combination of media relays transponder right for this communication in the A2 step, then the caller communication terminal sends to caller media relays transponder with the real-time communication data bag, and called communication terminal sends to called media relays transponder with the real-time communication data bag; Caller media relays transponder receives called media relays transponder mailing address the address of real-time communication data as called communication terminal, the source address of the real-time communication data bag of the caller communication terminal that receives is noted the address that receives real-time communication data as the caller communication terminal, and the real-time communication data bag of the caller communication terminal that receives transmitted to the mailing address of called media relays transponder, the real-time communication data bag that comes from called media relays transponder mailing address that receives is transmitted to the address that the caller communication terminal receives real-time communication data; Called media relays transponder receives caller media relays transponder mailing address the address of real-time communication data as the caller communication terminal, the source address of the real-time communication data bag of the called communication terminal that receives is noted the address that receives real-time communication data as called communication terminal, and the real-time communication data bag of the called communication terminal that will receive is transmitted the real-time communication data bag that comes from caller media relays transponder mailing address that receives to the mailing address forwarding of caller media relays transponder to the address that called communication terminal receives real-time communication data.
The step of described dismounting IP control of communication channel reciprocal process is as follows:
When C1. caller communication terminal or called communication terminal initiatively finish to communicate by letter, send ending request to the IP communication system;
C2. right if in the A2 step, selected the combination of media relays transponder, the IP communication system sends the request of dismounting to two right media relays transponders of selected media relays transponder combination, asks two media relays transponders to be recovered as the address and the port resource of this allocation of communications; If only selected a media relays transponder in the A2 step, the IP communication system sends the request of dismounting to selected media relays transponder, asks this media relays transponder to be recovered as the address and the port resource of this allocation of communications;
The C3.IP communication system is transmitted to another communication terminal with ending request, and another communication terminal is made ending request and finished to respond.
IP communication system of the present invention comprises: database has user profile, IP address and affiliated ISP type corresponding informance thereof; The network type detector reads the user and registers access address, IP address and affiliated ISP type corresponding informance thereof from database, obtain the ISP type that the user registers access address, and write database; The signaling Control Server, all users' location registration process in the jurisdictional system is registered access address with the user and is write database, controls foundation, modification and the dismounting of all multimedia communication sessions; The media relays transponder is transmitted the real-time communication data bag between the communication terminal both sides, communicate with other media relays transponder in the same grouping of the VPN interconnection that can guarantee by local area network (LAN) or bandwidth; The media relays distributor is located between signaling Control Server and the media relays transponder, is responsible for the selection of media relays transponder.
The present invention has following beneficial effect and advantage:
1. promote the IP telecommunication service quality effectively, reduction QoS problem.Because being redirected the default route between the ISP in the media delivery route, the present invention is the inside route between the media relays transponder, inner route is fully controlled by the reasonable deployment of media relays server, replace uncontrollable factor by controllable factors, therefore improved the service quality of IP communication effectively.
2. exploitativeness is strong.Because the present invention only need set up the media relays server with public network IP address in the IP communication system, IP network outside the IP communication system and various IP communication terminal be need not to make any modification, has good compatibility, therefore promoted exploitativeness.
3. extensibility is good.The present invention can set up the media relays transponder to very big limit in the loading range of signaling Control Server, have good expandability;
4. has load-balancing mechanism.Because the media relays distributor of system of the present invention according to set policy selection media relays transponder, by media relays repeater performance equiblibrium mass distribution, therefore has good load-balancing mechanism with traffic load.
Description of drawings
Fig. 1 is a principle schematic of the present invention;
Fig. 2 is an IP communication system architecture composition diagram of the present invention;
Fig. 3 is the flow chart that media relays distributor of the present invention is selected the media relays transponder;
Fig. 4 is communication terminal registration process figure of the present invention;
Fig. 5 is for selecting the right session interaction procedure chart of media relays transponder combination;
Fig. 6 handles the flow chart of real-time communication data bag for caller media relays transponder;
Fig. 7 is the flow chart that called media relays transponder is handled the real-time communication data bag;
Fig. 8 selects the session interaction procedure chart of a media relays transponder;
Fig. 9 is the flow chart that the media relays transponder is handled the real-time communication data bag when selecting a media relays transponder.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
(1) operation principle
As shown in Figure 1, the present invention specifies the media data transmission route according to the Different Dynamic of communication terminal network ISP of living in type, default route between the ISP in the media delivery route is redirected is the inside route between the media relays transponder, inner route is fully controlled by the reasonable deployment of media relays server, replace uncontrollable factor by controllable factors, improved the service quality of IP communication effectively.The inventive method and system are suitable for the various communication protocols of VoIP, and present embodiment adopts Session Initiation Protocol to describe.
(2) structure of IP communication system is formed
As shown in Figure 2, entire I P communication system can be divided into various terminal access devices and IP communication server system.In the IP communication server system, logic entity related to the present invention comprises functional units such as database, network type detector, signaling Control Server, media relays transponder and media relays distributor, wherein:
Database has user profile, IP address and affiliated ISP type corresponding informance thereof.
The network type detector reads the user and registers access address, IP address and affiliated ISP type corresponding informance thereof from database, obtain the ISP type that the user registers access address, and write database.
The signaling Control Server is the control centre of entire I P communication system, and all users' location registration process in the jurisdictional system is registered access address with the user and write database; Control foundation, modification and the dismounting of all multimedia communication sessions.The signaling Control Server is to handle unit with the communication session, set up in the process at control channel, send relay request to the media relays distributor, request media relays distributor is selected suitable media relays transponder for this communication session, carry the communication session sign in the relay request, communication terminal both sides ISP type, the Media Stream type, communication terminal sends the information such as expectation address of Media Stream, wherein the expectation address of communication terminal transmission Media Stream comprises: the address, source of 1) the entrained Media Stream address (must be public network address) and 2 of control signaling in the communication session negotiations process) controlling signaling in the communication session negotiations process that the signaling Control Server is received, after receiving the relaying response of media relays distributor, address and port in responding according to relaying, revise communication request or communication reply in about the address and the port of Media Stream.In the communication session demolishing process, send the request of dismounting to the media relays distributor, request media relays distributor notice media relays transponder discharges relay resource.
The media relays transponder is transmitted the real-time communication data bag between the communication terminal both sides; Communicate with other media relays transponder in the same grouping of the VPN that can guarantee interconnection by local area network (LAN) or bandwidth.Be provided with in the IP communication system one at the most platform have the media relays transponder of public network IP address, be divided into different grouping according to interoperability between the media relays transponder, VPN (the Virtual Private Network that can guarantee by local area network (LAN) or bandwidth, Virtual Private Network) Hu Lian media relays transponder belongs to same grouping, and the different media relays transponders that belong to same grouping have different ISP and insert.After receiving the real-time communication data bag, the media relays transponder is transmitted the data that receive to another media relays transponder of another communication terminal or combination centering simply, real time data is not made other additional operations, reduce the forwarding time delay of real time data as far as possible.For preventing malicious attack or Communication Jamming, the media relays transponder only accepts to come from the real time data of expectation address or expectation address field.Described expectation address is generated by the signaling Control Server and passes over by the media relays distributor; Described expectation address field be with the expectation address before the identical address field of 24 bit binary number.
The media relays distributor is located between signaling Control Server and the media relays transponder, finishes the selection function of media relays transponder.The media relays distributor is to handle unit with the communication session, according to the ISP type of communication terminal both sides' ISP type, current all available media relays transponders and the interoperability of media relays transponder, select optimum media relays transponder to provide service for this communication session.The decision condition of described media relays transponder availability is: after m request all do not meet with a response continuously, the media relays distributor judged that this media relays transponder is unavailable temporarily; N in second the media relays distributor no longer select this media relays transponder; N resets this media relays transponder after second be upstate, and in the present embodiment, the m value is 2, and the N value is 300.As shown in Figure 3, the media relays distributor receives the relay request of signaling Control Server, and judge when not existing in the relay request communication session to identify pairing communication session, begin to select optimum media relays transponder for new communication session, selection course is as follows: when the communication terminal both sides were in same ISP type network, the media relays distributor was selected a media relays transponder with identical ISP type for this communication session; When the communication terminal both sides are in different I SP type network, the media relays distributor is preferential, and to select to belong to the combination that two media relays transponders that are consistent with communication terminal both sides ISP type of same grouping form right, if it is right not satisfy the media relays transponder combination of communication terminal both sides ISP type, according to a media relays transponder called or that caller communication terminal ISP type selecting is suitable.
(3) the netted trunking method in control media delivery path
The inventive method may further comprise the steps:
(31) in the IP communication system, be provided with one at the most platform have the media relays transponder of public network IP address.
(32) will be divided into different grouping according to interoperability between the media relays transponder, the media relays transponder of the VPN interconnection that local area network (LAN) or bandwidth can be guaranteed is classified same grouping as; The different media relays transponders that belong to same grouping have different ISP and insert.
(33) in the communication terminal registration process, the IP communication system is judged its ISP type that belongs to.The endpoint registration process of described IP communication system as shown in Figure 4, various terminal access devices send register requirement (being the REGISTER message in the Session Initiation Protocol) to the signaling Control Server of IP communication server system after startup.The signaling Control Server is accepted the register requirement from various terminal equipments, and will register the access address information registering in database.The network type detector is obtained the user and is registered access address from database, carry out the longest coupling according to IP address and affiliated ISP type corresponding informance thereof, obtains user's ISP type, and writes database.
(34) in setting up IP control of communication channel reciprocal process, it is right that the IP communication system is selected a suitable media relays transponder according to the availability situation of the ISP type of communication terminal and media relays transponder or belonged to the combination of being made up of two media relays transponders of same grouping.Describe for convenient, setting up process with the session of communication terminal UA-1 among Fig. 5 and UA-2 below is example.
A11. communication terminal UA-1 will call out another communication terminal UA-2, communication terminal UA-1 at first sends communication request (being the INVITE in the Session Initiation Protocol) to the signaling Control Server, communication terminal UA-1 that the signaling Control Server is obtained by the network type detector in advance according to the inquiry of the caller in the communication request and called number and the ISP type information of UA-2, might as well be made as ISP-1 and ISP-2, this moment, UA-1 was the caller communication terminal, and UA-2 is called communication terminal;
A12. the signaling Control Server sends relay request to the media relays distributor, the ISP type, Media Stream type, the caller communication terminal UA-1 that carry communication session sign, caller communication terminal UA-1 and called communication terminal UA-2 in the request send the information such as expectation address of Media Stream, entrust the media relays distributor to select suitable media relays transponder for this communication session.The media relays distributor is selected suitable media relays transponder according to communication terminal both sides' ISP type information.Because communication terminal both sides' ISP type is respectively ISP-1 and ISP-2, and media relays transponder-1 in the same grouping and media relays transponder-2 have the network insertion of ISP-1 and ISP-2 type respectively, and the media relays distributor has preferentially selected media relays transponder-1 and media relays transponder-2 combination to being this communication service;
A13. the media relays distributor sends relay request to the media relays transponder-2 of the selected combination centering of A12 step, request media relays transponder-2 be this allocation of communications address and port, carries in the request that communication session identifies, information such as the ISP type of caller communication terminal UA-1 and called communication terminal UA-2, Media Stream type.Media relays transponder-2 is this allocation of communications address and port, and above-mentioned address and port is put into relaying respond and pass to the signaling Control Server by the media relays distributor;
A14. address and port during the signaling Control Server is responded according to relaying are revised in the communication request address and port (being the SDP part of INVITE in the Session Initiation Protocol) about Media Stream, and amended communication request is sent to called communication terminal UA-2;
A15. after called communication terminal UA-2 determines to accept this communication, reply this communication and loopback communication and reply (the 200OK message that is INVITE correspondence in the Session Initiation Protocol) signaling Control Server to the IP communication server system;
A16. after the communication that receives called communication terminal UA-2 of signaling Control Server is replied, send relay request, carry the information such as expectation address that communication session sign, called communication terminal UA-2 send Media Stream in the request to the media relays distributor; The media relays distributor sends relay request to the media relays transponder-1 of the selected combination centering of A12 step, carry the expectation address of communication session sign, caller communication terminal UA-1 transmission Media Stream, the information such as mailing address that media relays transponder-2 distributes port information and media relays transponder-2 for this signal post in the request, request media relays transponder-1 is this allocation of communications address and port; Media relays transponder-1 is this allocation of communications address and port, and above-mentioned address and port is put into relaying respond by the loopback of media relays distributor and give the signaling Control Server; The media relays distributor sends a relaying notice to media relays transponder-2 simultaneously, carries the expectation address that communication session identifies, called communication terminal UA-2 sends Media Stream, media relays transponder-1 distributes port information and media relays transponder-1 for this signal post information such as mailing address in the relaying notice;
A17. address and port during the signaling Control Server is responded according to relaying, revise communication reply in about the address and the port (being the SDP part of 200 OK message in the Session Initiation Protocol) of Media Stream, and amended communication replied send to caller communication terminal UA-1;
A18. caller communication terminal UA-1 sends communication acknowledgement (being the ACK message in the Session Initiation Protocol) to the signaling Control Server, the signaling Control Server is transmitted communication acknowledgement to called communication terminal UA-2, has so just set up an indirect control channel between caller communication terminal UA-1 and called communication terminal UA-2.
(35) communication terminal is set up media channel by the media relays transponder, and concrete steps are as follows:
B11. caller communication terminal UA-1 is after the communication of confirming is successfully set up, from replying, communication extracts the IP address and the port of distant terminal receiving media stream, and to this IP address and the local real-time communication data bag of port transmission, this IP address and port have been modified as the IP address and the port of media relays transponder-1 in steps A 17 by the signaling Control Server, so caller communication terminal UA-1 has sent to media relays transponder-1 with the real-time communication data bag;
B12. called communication terminal UA-2 is after the communication of confirming is successfully set up, from communication request, extract the IP address and the port of distant terminal receiving media stream, and to this IP address and the local real-time communication data bag of port transmission, this IP address and port have been modified as the IP address and the port of media relays transponder-2 in steps A 14 by the signaling Control Server, so called communication terminal UA-2 has sent to media relays transponder-2 with the real-time communication data bag;
B13. as shown in Figure 6, after media relays transponder-1 receives the real-time communication data bag, judge at first whether the real-time communication data bag that receives is to come from expectation address or the expectation address field that the caller communication terminal sends the real-time communication data bag, in this way, then the source address of the real-time communication data bag that receives is noted the address that receives the real-time communication data bag as caller communication terminal UA-1, and the real-time communication data bag that receives is transmitted to the mailing address of media relays transponder-2; Otherwise, further judge whether it is the mailing address that comes from media relays transponder-2, as denying, then the real-time communication data bag that receives is made discard processing, in this way, then judge whether to have write down the address that caller communication terminal UA-1 receives the real-time communication data bag, if, then the real-time communication data bag that receives is transmitted to the address that caller communication terminal UA-1 receives the real-time communication data bag, otherwise the real-time communication data bag that receives is made discard processing.As shown in Figure 7, after media relays transponder-2 receives the real-time communication data bag, judge at first whether the real-time communication data bag that receives is to come from expectation address or the expectation address field that called communication terminal sends the real-time communication data bag, in this way, then the source address of the real-time communication data bag that receives is noted the address that receives the real-time communication data bag as called communication terminal UA-2, and the real-time communication data bag that receives is transmitted to the mailing address of media relays transponder-1; Otherwise, judge further whether it is the mailing address that comes from media relays transponder-1, as not, then the real-time communication data bag that receives is made discard processing; In this way, then judge whether to have write down the address that called communication terminal UA-2 receives the real-time communication data bag, if, then the real-time communication data bag that receives is transmitted to the address that caller communication terminal UA-2 receives the real-time communication data bag, otherwise the real-time communication data bag that receives is made discard processing.So just between caller communication terminal UA-1 and called communication terminal UA-2 communication terminal, set up an indirect media channel through media relays transponder-1 and media relays transponder-2.
(36) behind the sign off, the IP communication system is removed media channel.
Describe for convenient, the communication session demolishing process with caller communication terminal UA-1 among Fig. 5 and called communication terminal UA-2 is an example below.
When C11. caller communication terminal UA-1 active on-hook finishes communication, send ending request (being the BYE message in the Session Initiation Protocol) to the control signal server;
C12. control signal server and send the request of dismounting to the media relays distributor; The media relays distributor is transmitted the request of dismounting to media relays transponder-1 selected in the A2 step and media relays transponder-2, and request media relays transponder-1 and media relays transponder-2 are recovered as the address and the port resource of this allocation of communications;
C13. the signaling Control Server is transmitted to called communication terminal UA-2 with ending request, and called communication terminal UA-2 makes ending request and finishes to respond.
Present embodiment is selected a media relays transponder for the IP communication system and is communicated.Be that with the difference of embodiment 1 content of step (34), (35) and (36) is distinguished to some extent in the netted trunking method in the control media delivery path of corresponding embodiment 1, reach (36a) sign, specifically describe as follows with step (34a), (35a):
(34a) in setting up IP control of communication channel reciprocal process, setting up process with the session of communication terminal UA-1 among Fig. 8 and UA-2 is example, and the ISP type of communication terminal UA-1 and UA-2 is identical, might as well be made as ISP-1.
A21. communication terminal UA-1 will call out another communication terminal UA-2, communication terminal UA-1 at first sends communication request (being the INVITE in the Session Initiation Protocol) to the signaling Control Server, communication terminal UA-1 that the signaling Control Server is obtained by the network type detector in advance according to the inquiry of the caller in the communication request and called number and the ISP type information of UA-2, be ISP-1, this moment, UA-1 was the caller communication terminal, and UA-2 is called communication terminal;
A22. the signaling Control Server sends relay request to the media relays distributor, the ISP type, Media Stream type, the caller communication terminal UA-1 that carry communication session sign, caller communication terminal UA-1 and called communication terminal UA-2 in the request send the information such as expectation address of Media Stream, entrust the media relays distributor to select suitable media relays transponder for this communication session.The media relays distributor is selected suitable media relays transponder according to communication terminal both sides' ISP type information.Because communication terminal both sides' ISP type is identical and be ISP-1, the media relays distributor has selected one to have the media relays transponder-3 that the ISP-1 type network inserts and be this communication service;
A23. the media relays distributor sends relay request to selected media relays transponder-3, request media relays transponder-3 is this allocation of communications address and port, and the ISP type, Media Stream type, the caller communication terminal UA-1 that carry communication session sign, caller communication terminal UA-1 and called communication terminal UA-2 in the request send the information such as expectation address of Media Stream.Media relays transponder-3 is this allocation of communications address and port, and above-mentioned address and port is put into relaying respond and pass to the signaling Control Server by the media relays distributor;
A24. address and port during the signaling Control Server is responded according to relaying are revised in the communication request address and port (being the SDP part of INVITE in the Session Initiation Protocol) about Media Stream, and amended communication request is sent to called communication terminal UA-2;
A25. after called communication terminal UA-2 determines to accept this communication, reply this communication and loopback communication and reply (the 200OK message that is INVITE correspondence in the Session Initiation Protocol) signaling Control Server to the IP communication server system;
A26. after the communication that receives called communication terminal UA-2 of signaling Control Server is replied, send relay request, carry the information such as expectation address that communication session sign, called communication terminal UA-2 send Media Stream in the request to the media relays distributor; The media relays distributor sends relay request to selected media relays transponder-3, carry the information such as expectation address of communication session sign, called communication terminal UA-2 transmission Media Stream in the request, request media relays transponder-3 is this allocation of communications address and port; Media relays transponder-3 is put into relaying with addresses distributed and port in the A23 step and is responded by the loopback of media relays distributor to the signaling Control Server;
A27. address and port during the signaling Control Server is responded according to relaying, revise communication reply in about the address and the port (being the SDP part of 200 OK message in the Session Initiation Protocol) of Media Stream, and amended communication replied send to caller communication terminal UA-1;
A28. caller communication terminal UA-1 sends communication acknowledgement (being the ACK message in the Session Initiation Protocol) to the signaling Control Server, the signaling Control Server is transmitted communication acknowledgement to called communication terminal UA-2, has so just set up an indirect control channel between caller communication terminal UA-1 and called communication terminal UA-2.
(35a) set up media channel by media relays transponder-3 between caller communication terminal UA-1 and the called communication terminal UA-2, concrete steps are as follows:
B21. caller communication terminal UA-1 is after the communication of confirming is successfully set up, from replying, communication extracts the IP address and the port of distant terminal receiving media stream, and to this IP address and the local real-time communication data bag of port transmission, this IP address and port have been modified as the IP address and the port of media relays transponder-3 in steps A 27 by the signaling Control Server, so caller communication terminal UA-1 has sent to media relays transponder-3 with the real-time communication data bag;
B22. called communication terminal UA-2 is after the communication of confirming is successfully set up, from communication request, extract the IP address and the port of distant terminal receiving media stream, and to this IP address and the local real-time communication data bag of port transmission, this IP address and port have been modified as the IP address and the port of media relays transponder-3 in steps A 24 by the signaling Control Server, so called communication terminal UA-2 has sent to media relays transponder-3 with the real-time communication data bag;
B23. as shown in Figure 9, after media relays transponder-3 receives the real-time communication data bag, judge at first whether the real-time communication data bag that receives is to come from expectation address or the expectation address field that the caller communication terminal sends the real-time communication data bag, in this way, then the source address of the real-time communication data bag that receives is noted the address that receives real-time communication data as caller communication terminal UA-1; Further judge whether to have write down the address that called communication terminal receives the real-time communication data bag then, in this way, then the real-time communication data bag that receives is transmitted to the address that called communication terminal UA-2 receives the real-time communication data bag, otherwise the real-time communication data bag that receives is made discard processing; When above-mentioned judged result is that the real-time communication data bag that receives is not to come from expectation address or the expectation address field that the caller communication terminal sends the real-time communication data bag, judge then whether it is to come from expectation address or the expectation address field that called communication terminal sends the real-time communication data bag, as denying, then the real-time communication data bag that receives is made discard processing, in this way, the source address of the real-time communication data bag that receives is noted the address that receives the real-time communication data bag as called communication terminal; Further judge whether to have write down the address that the caller communication terminal receives the real-time communication data bag, in this way, then the real-time communication data bag that receives is transmitted to the address that the caller communication terminal receives the real-time communication data bag, otherwise the real-time communication data bag is made discard processing.So just between caller communication terminal UA-1 and called communication terminal UA-2 communication terminal, set up an indirect media channel through media relays transponder-3.
(36a) behind the sign off, the IP communication system is removed media channel.
Describe for convenient, the communication session demolishing process with caller communication terminal UA-1 among Fig. 8 and called communication terminal UA-2 is an example below.
When C21. caller communication terminal UA-1 active on-hook finishes communication, send ending request (being the BYE message in the Session Initiation Protocol) to the control signal server;
C22. control signal server and send the request of dismounting to the media relays distributor; The media relays distributor is transmitted the request of dismounting to media relays transponder-3 selected in the A22 step, and request media relays transponder-3 is recovered as the address and the port resource of this allocation of communications;
C23. the signaling Control Server is transmitted to called communication terminal UA-2 with ending request, and called communication terminal UA-2 makes ending request and finishes to respond.
For those skilled in the art; after having understood content of the present invention and principle; can be under the situation that does not deviate from the spirit and scope of the present invention; " netted media relays " method according to control media delivery path in the IP of the present invention communication is carried out multiple correction and distortion, but these based on correction of the present invention and distortion still within claim protection range of the present invention.
Claims (10)
1. netted trunking method of controlling the media delivery path is characterized in that having following steps:
In the IP communication system, be provided with one at the most platform have the media relays transponder of public network IP address;
The media relays transponder is divided into different grouping according to interoperability, and the different media relays transponders that belong to same grouping have different ISP and insert;
In the communication terminal registration process, the IP communication system is judged its ISP type that belongs to;
In setting up IP control of communication channel reciprocal process, it is right that the IP communication system is selected a media relays transponder or belonged to the combination of being made up of two media relays transponders of same grouping;
Communication terminal is set up media channel by the media relays transponder;
Behind the sign off, the IP communication system is removed media channel.
2. the netted trunking method in control media delivery as claimed in claim 1 path is characterized in that: be that the media relays transponder of VPN interconnection that local area network (LAN) or bandwidth can be guaranteed is classified same grouping as the described media relays transponder is divided into groups.
3. the netted trunking method in control media delivery as claimed in claim 1 path is characterized in that the communication terminal registration process of described IP communication system is as follows:
Communication terminal starts the back and sends register requirement to the IP communication system;
The IP communication system is accepted the register requirement from communication terminal, and according to the ISP type of registering IP address information acquisition communication terminal.
4. the netted trunking method in control media delivery as claimed in claim 1 path, the step that it is characterized in that setting up IP control of communication channel reciprocal process is as follows:
A1. communication initiator is that the caller communication terminal sends communication request to the IP communication system, and the IP communication system is inquired about the ISP type information that obtains in advance according to caller in the communication request and called number;
The A2.IP communication system is according to the ISP type selecting media relays transponder of communication terminal, if communication terminal both sides' ISP type is identical, then selects a media relays transponder with identical ISP type; If communication terminal both sides' ISP type difference, the combination that then preferential two media relays transponders that are consistent with communication terminal both sides ISP type of selecting to belong to same grouping are formed is right, if it is right not satisfy the media relays transponder combination of communication terminal both sides ISP type, can be according to media relays transponder of ISP type selecting of called communication terminal or caller communication terminal;
A3. right if in above-mentioned A2 step, selected the combination of media relays transponder, the IP communication system is that called media relays transponder sends relay request to the media relays transponder identical with called communication terminal ISP type of selected media relays transponder combination centering, and asking called media relays transponder is this allocation of communications address and port; If in the A2 step, only selected a media relays transponder, the IP communication system sends relay request to this media relays transponder, this media relays transponder is this allocation of communications address and port, and relaying response loopback is put into to the IP communication system in above-mentioned address and port;
Address and port during the A4.IP communication system is responded according to relaying are revised Media Stream address and port relevant in the communication request, and amended communication request are sent to called communication terminal;
A5. after called communication terminal determines to accept this communication, reply this communication and loopback communication and reply the IP communication system;
After the communication that the A6.IP communication system receives called communication terminal loopback is replied, if it is right to have selected the combination of media relays transponder in the A2 step, then the media relays transponder identical with caller communication terminal ISP type to selected media relays transponder combination centering is that caller media relays transponder sends relay request, and request caller media relays transponder is this allocation of communications address and port; If in the A2 step, only selected a media relays transponder, then send relay request to this media relays transponder, asking this media relays transponder is this allocation of communications address and port, and above-mentioned address and port are put into relaying respond loopback and give the IP communication system, the IP communication system sends a relaying notice to called media relays transponder simultaneously;
Address and port during the A7.IP communication system is responded according to relaying, revise communication reply in relevant Media Stream address and port, and amended communication replied send to the caller communication terminal;
A8. the caller communication terminal sends communication acknowledgement to the IP communication system, and the IP communication system is transmitted communication acknowledgement to called communication terminal.
5. the netted trunking method in control media delivery as claimed in claim 4 path, it is characterized in that: after the media relays transponder is chosen, for the communication terminal both sides are provided with expectation address and the expectation address field that sends the real-time communication data bag, only accept to come from the real-time communication data bag of expectation address or expectation address field.
6. the netted trunking method in control media delivery as claimed in claim 5 path is characterized in that the expectation address of described real-time communication data bag is: the entrained Media Stream public network address of control signaling in the address, source of control signaling and/or the communication negotiation process in the communication negotiation process that the IP communication system is received.
7. the netted trunking method in control media delivery as claimed in claim 5 path is characterized in that: the expectation address field of real-time communication data bag for the expectation address before the identical address field of 24 bit binary number.
8. the netted trunking method in control media delivery as claimed in claim 1 path, it is as follows to it is characterized in that described media channel is set up the step of process:
B1. the caller communication terminal is after confirming that control channel is successfully set up, from communication is replied, extract the IP address and the port of the media relays transponder of in steps A 7, being revised by the IP communication system, and send local real-time communication data bag to this IP address and port;
B2. called communication terminal is after confirming that control channel is successfully set up, from communication request, extract the IP address and the port of the media relays transponder of in steps A 4, being revised by the IP communication system, and send local real-time communication data bag to this IP address and port;
B3. if in the A2 step, selected a media relays transponder for this communication, then caller communication terminal and called communication terminal all send to the real-time communication data bag same media relays transponder, the address that receives the real-time communication data bag as this communication terminal noted the source address of the real-time communication data bag that receives by the media relays transponder, receive communication terminal both sides' real-time communication data bag when the media relays transponder after, can transmit the real-time communication data bag to distant terminal; If selected the combination of media relays transponder right for this communication in the A2 step, then the caller communication terminal sends to caller media relays transponder with the real-time communication data bag, and called communication terminal sends to called media relays transponder with the real-time communication data bag; Caller media relays transponder receives called media relays transponder mailing address the address of real-time communication data as called communication terminal, the source address of the real-time communication data bag of the caller communication terminal that receives is noted the address that receives real-time communication data as the caller communication terminal, and the real-time communication data bag of the caller communication terminal that receives transmitted to the mailing address of called media relays transponder, the real-time communication data bag that comes from called media relays transponder mailing address that receives is transmitted to the address that the caller communication terminal receives real-time communication data; Called media relays transponder receives caller media relays transponder mailing address the address of real-time communication data as the caller communication terminal, the source address of the real-time communication data bag of the called communication terminal that receives is noted the address that receives real-time communication data as called communication terminal, and the real-time communication data bag of the called communication terminal that will receive is transmitted the real-time communication data bag that comes from caller media relays transponder mailing address that receives to the mailing address forwarding of caller media relays transponder to the address that called communication terminal receives real-time communication data.
9. as the netted trunking method in claim 1 or the described control media delivery of claim 4 path, it is characterized in that the step of removing IP control of communication channel reciprocal process is as follows:
When C1. caller communication terminal or called communication terminal initiatively finish to communicate by letter, send ending request to the IP communication system;
C2. right if in the A2 step, selected the combination of media relays transponder, the IP communication system sends the request of dismounting to two right media relays transponders of selected media relays transponder combination, asks two media relays transponders to be recovered as the address and the port resource of this allocation of communications; If only selected a media relays transponder in the A2 step, the IP communication system sends the request of dismounting to selected media relays transponder, asks this media relays transponder to be recovered as the address and the port resource of this allocation of communications;
The C3.IP communication system is transmitted to another communication terminal with ending request, and another communication terminal is made ending request and finished to respond.
10. IP communication system is characterized in that comprising:
Database has user profile, IP address and affiliated ISP type corresponding informance thereof;
The network type detector reads the user and registers access address, IP address and affiliated ISP type corresponding informance thereof from database, obtain the ISP type that the user registers access address, and write database;
The signaling Control Server, all users' location registration process in the jurisdictional system is registered access address with the user and is write database, controls foundation, modification and the dismounting of all multimedia communication sessions;
The media relays transponder is transmitted the real-time communication data bag between the communication terminal both sides; Communicate with other media relays transponder in the same grouping of the VPN that can guarantee interconnection by local area network (LAN) or bandwidth;
The media relays distributor is located between signaling Control Server and the media relays transponder, is responsible for the selection of media relays transponder.
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