CN1588922A - Method for calling control and medium pass through private net in SIP soft exchange system - Google Patents
Method for calling control and medium pass through private net in SIP soft exchange system Download PDFInfo
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- CN1588922A CN1588922A CNA2004100802475A CN200410080247A CN1588922A CN 1588922 A CN1588922 A CN 1588922A CN A2004100802475 A CNA2004100802475 A CN A2004100802475A CN 200410080247 A CN200410080247 A CN 200410080247A CN 1588922 A CN1588922 A CN 1588922A
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Abstract
A method for calling control and pass through private network by media streams in SIP soft exchange system is realized by common network, private network, agent servers, re-directioning serves and media steam agent serves connected on the common network, various user terminals on private network and NAT/Firewall soft exchange system connected with both of them including the following steps: various terminal devices in the private register to the re-directioning server definitely, by which, the calling party gets the common and private addresses of the called party to set up communication between the two by the media stream server suitable for the soft exchange system based on SIP protocol which enables surrounding devices of SIP to intercommunicated, signalings and media streams to pass through NAT/Firewall transparently either multiplayer or multikind.
Description
Technical field
The present invention relates to a kind of IP communication means, particularly relate to the method for calling out control and medium pass through private net in a kind of SIP soft switchcall server in the NAT/Firewall environment.
Background technology
Along with the development of internet technique, the Softswitch technology of IP based network agreement is also in develop rapidly.Soft switch is called Call Agent, call server or Media Gateway Controller again.The basic conception of Softswitch technology is that CCF is separated from transport layer (media gateway), realize the basic call controlled function by the software on the server, as call routing, signalling interworking, management control (set up session, remove session) etc.Different with traditional stored-program control exchange, the calling control and the business of traditional stored-program control exchange combine the CCF difference of different service needed.Soft switch is different with traditional stored-program control exchange in this, and it calls out control and independent of service, and the CCF that soft switch provides is a kind of basic call control.Owing to separate calling out control and transfer of data, set up the plane of separating for control, exchange and software programmable function, service supplier can be combined transport service and control protocol easily, realize the transfer of basic service and supplementary service.Softswitch technology will make voice network and the perfect fusion of data network, and the information of form of ownerships such as collection voice, data, video is one, forms comprehensive network, promotes the fast development of every value-added service.
Relatively more good at present signaling control protocol---SIP (conference initiation agreement) is adopted in soft switch usually.The advantage of SIP pattern is to combine closely with the Internet, principle such as on style, follow consistent terse, open, compatible in the Internet and can expand, have advantages such as simple and flexible, distributed control, be suitable for developing voice application new, that combine with the Internet, become and use signaling control protocol the most widely in the IP field, use the terminal of Session Initiation Protocol to be called sip terminal.In SIP, also need the SDP agreement to come the descriptive session announcement, comprising the message such as address port of medium.
Along with based on the popularizing of the Internet of TCP/IP, the local area network (LAN) of various scales is used by a large amount of the establishment, and in this local area network (LAN), each network equipment adopts the IP address of local area network (LAN) at local area network registration, connects to form network relatively independent and sealing.This local area network (LAN) is commonly referred to as private network (abbreviation private network), and corresponding, the Internet is called public network.The network equipment in these local area network (LAN)s uses private net address.We can say, in current network world, use the quantity of the network equipment of private network IP address, be far longer than the number of devices that has IP address, legal the Internet (public network).
In order to allow each terminal in the private network can visit the private network external resource, usually between private network and public network, use network address port conversion (NAT) to distribute a legal public network IP address and a port numbers for the inside terminals of request visit external network, finish realization visiting from outside.In general, because the address resource of the IP agreement of using is limited now, the quantity of the public network address that private network can be applied for is the terminal quantity in the private network, so NAT is just to the provisional branch matching method public network address and the port of terminal of active request visit public network resource.
For the safety of network, fire compartment wall is installed also generally between private network and the public network.NAT and fire compartment wall use usually simultaneously, are collectively referred to as NAT/Firewall, and its combination has polytype.Take all factors into consideration under the situation of analysis at NAT and Firewall, NAT and Firewall can be divided into 4 classes (defining) in RFC3489: the complete pattern of a. (Full cone); B. unrestricted model (Restricted Cone); C. port limit pattern (Port Restricted Cone); D. symmetric pattern (Symmetric).
The destination address and the destination slogan of each packet that the fire compartment wall inspection is come in from external network, its often like this is provided with: if the station terminal B of a station terminal A outside fire compartment wall in the fire compartment wall initiatively the request of sending want data, the packet that fire compartment wall can allow terminal B beam back passes through when destination address, port numbers are all identical; If the packet rs destination address that terminal B beams back is identical, but port numbers is different, fire compartment wall also can be abandoned this packet.According to the difference of NAT/Firewall type, the influence of communicating by letter also is not quite similar, symmetric pattern is the strictest among four kinds of NAT/Firewall.
This just as can be seen, NAT/Firewall has destroyed the design concept of the Internet the most basic " transparency end to end " when bringing benefits such as saving IP address space, private network safety, increased the complexity of network, has hindered professional innovation.Because for any one terminal in the private network, IP address during its visit external network and port numbers are only just to give when this terminal is initiatively initiated to ask and distribute, and this influences the problem of soft switch with regard to NATNAT/Firewall having occurred.
The influence that NAT/Firewall instructs to signaling: suppose that now we have a flexible exchanging network based on Session Initiation Protocol as shown in Figure 1, in this network, terminal Tel A and terminal Tel B are in private network, has only private network IP address, if terminal A is to the terminal B request of making a call, then can produce INVITE sip999@10.0.0.7:5060SIP2.0 (SDP of 10.0.0.2:5004) request package shown in Fig. 1 first row, this request package is mailing on the 10.0.0.7 port 5060 through sip proxy server, because terminal B is in private network, obviously because the influence of NAT/Firewall, do not arrive terminal B during this request package, conversation can't set up.
The influence that NAT and Firewall communicate by letter to signaling: shown in Fig. 1 message sequence chart, in this simple voice call service process, all places of making fork all are the places that NAT hinders communication.As at the 3:INVITEsip:999@10.0.0.7:5060 of correspondence SIP/2.0 (SDP of 10.0.0.2:5004), SIP Proxy can be dealt into the INVITE of this SIP bag on 5060 ports of 10.0.0.7 address, but it is actual according to the strictest NAT (NAT of Symmetric pattern discussed above), this bag can't arrive phone B, conversation also can't be set up certainly, because phone B is behind NAT, the direct route that network can't be correct.The several of other have the place of red fork that similar problem is also arranged.
The influence that NAT and Firewall communicate by letter to Media Stream: shown in Fig. 1 message sequence chart, RTP uses udp protocol, does not generally have fixed port.When A calls out B, it is address and port such as the 10.0.0.2:5004 that conversation is prepared that SDP in the INVITE bag has just described phone A, like this after conversation is normally set up, the destination address of the Media Stream RTP bag of phone B, just should be 10.0.0.2:5004, but the influence of NAT is arranged, and this bag can't arrive A.Same reason, B is beaming back also told A when SIP wraps 200 OK (SDP of 10.0.0..7:5005) ready address and port to A, A is after conversation is set up, and the bag of sending out to 10.0.0..7:5005 equally suffers the influence of NAT, can't arrive destination address.
For solving the influence of NAT to network service, many methods have been arranged at present, relatively more commonly used having is following several:
1.DMZ?Proxy。Solve fire compartment wall and NAT crossing problem by sip agent being placed on the DMZ zone.Shortcoming is can't pass through for multi-layer NAT.
2. ALG.ALG (Application layer gateways) is designed to discern the fire compartment wall of assigned ip agreement (as Session Initiation Protocol), also is called ALG Firewall.Whether it is not to watch packet packet header message simply to decide packet can pass through, but the more data in the analysis packet load of deep layer, the just data of application layer.Shortcoming is to need to revise or the upgrading fire compartment wall.
3. penetration tunnel.The penetration tunnel solution is made of two assemblies, Server software and Client.Server is placed on public network, and Client is placed in the private network, has set up the passage of normal connection between them.Shortcoming is the normal connection that need set up TCP, and it is many to take Internet resources.
4.STUN。Terminal is sent out message to the Stun server earlier, and the Stun server detects external IP and the Port of the Nat at terminal place, and informs when terminal, terminal are received outside the request in back, just tells its external address to construct SIP and SDP message with Stun.Shortcoming is to pass through the NAT of symmetric pattern (Symmetrie).
5.B2BUA。Terminal is sent out registration packet to Register Server earlier, returns the 200OK that comes and can tell phone behind fire compartment wall, and phone connects with B2BUA with TCP sets up passage, and the conversation of later phone is all acted on behalf of by B2BUA.But this mode does not meet the SIP standard.
More than several schemes can both solve the NAT/Firewall problem, but shortcoming is separately arranged also, what have will revise NAT and fire compartment wall, sacrifices the safety of network; The needs change Session Initiation Protocol that has, upgrading sip terminal, the versatility of sacrificial system; What have can only be effective to specific NAT/Firewall, just powerless for stricter a little NAT/Firewall; What have can only pass through NAT/Firewall one, if in the face of the multilayer subnet, just can't realize two-way communication.
Summary of the invention
The purpose of this invention is to provide a kind of shortcoming that can overcome above-mentioned the whole bag of tricks, existing strong ride-through capability, and the standard of use Session Initiation Protocol, again need not exchange device more the calling control and the Media Stream method for communicating of soft switchcall server.
Call out the method for control and medium pass through private net in the SIP soft switchcall server of the present invention, by comprising public network, private network, be connected sip proxy server, Redirect Server and Media Stream acting server on the public network, the soft switchcall server realization signaling and the Media Stream control that are connected the various sip user terminals on the private network and connect the NAT/Firewall of public network private network, the concrete steps of described method are:
1) the various terminal equipments in the private network regularly send registration packet to separately acting server, comprise the private net address of terminal in this registration packet;
2) source of the registration packet sent from terminal equipment of acting server obtains the public network address of terminal, obtains the private net address of terminal from registration packet, together with the public network address of acting server, mails to Redirect Server in the lump;
3) Redirect Server is deposited these addresses in proper order by proxy server address, terminal public network address, terminal private net address;
4) calling party's acting server is revised the address in the request package when receiving the request of caller equipment, makes the sensing media server, sends request to Redirect Server;
5) after Redirect Server is received the call request of calling party's acting server, callee's proxy server address is returned;
6) after calling party's acting server is received these return messages, send request to callee's acting server;
7) after callee's acting server is received the call request of calling party's acting server, send request, after Redirect Server is received this request, return the public network address and the private net address of called equipment to callee's acting server to Redirect Server;
8) after callee's acting server is received the return messages of Redirect Server, send the call request that has the called party instrument private net address to constitute to the public network address of called party instrument, called party instrument receives that the back beams back response packet to calling party's equipment;
9) calling party's acting server is revised called equipment and is issued address contents in the response packet of caller equipment through this acting server, making conversation point to media stream server;
10) Media Stream agency determines that by first media stream packets of the calling and called equipment received the calling and called both sides are used for the public network address that Media Stream is communicated by letter, and sets up communication, and after transmit Media Stream.
The Media Stream of the soft switchcall server among the present invention adopts the RTP RTP.
The used media stream data bag of the present invention adopts the UDP datagram form.
The present invention can interconnect every standard compliant SIP soft switch ancillary equipment by in the improvement aspect soft switch calling control and the Media Stream control, and is compatible good; Passing through NAT/Firewall that signaling and Media Stream are transparent can pass through multi-layer NAT/Firewall, can pass through multiple NAT/Firewall; And do not need to preempt passage, can save the ample resources of user, network and soft switchcall server.
Description of drawings
Fig. 1 is the message sequence chart of signaling instruction and Media Stream process of transmitting in the soft switch process;
Fig. 2 is the network diagram of calling out control and medium pass through private net method in the SIP soft switchcall server of the present invention.
Embodiment
In concrete the application, according to the residing network of calling and called in the communication process, can be divided into: public network is called out public network, and public network is called out private network, private net calling public network, four kinds of situations of private net calling private network.Wherein the private net calling private network is to be subjected to NAT/Firewall to restrict serious situation.Here we are that example describes with the situation of private net calling private network just.The packet of below describing in the process to be sent out all sends with datagram format (UDP).
As shown in Figure 2, IP phone and IP PBX (switch) are placed on respectively in two private networks behind the NAT/Firewall, and the agency of IP phone is a sip agent 1, and the agency of IP PBX is a sip agent 2.
Power at IP PBX and can send registration packets to sip agent 2 after configuration finishes, this registration packet is the Register bag that defines in the Session Initiation Protocol, and clockwise sip agent 2 sent a registration packet in per after this 5 minutes, for reducing taking to terminal and soft switchcall server resource, also in order to reduce the taking of Internet resources, these registration packets send with the UDP form.After sip agent 2 is received the registration packet of IP PBX, obtain the public network address (this address produces through NAT conversion back) that IP PBX is used for the signaling mailing address from the source that UDP wraps; In addition, sip agent 2 has also obtained the private net address that IPPBX is used for the signaling mailing address in the UDP bag in the SIP bag of encapsulation; Add the address of sip agent 2 oneself, sip agent 2 these three addresses according to sip agent 2 addresses, IP PBX public network address, the order of IP PBX private net address is put into registration packet and is mail to Redirect Server.
After Redirect Server is received the registration packet of sip agent 2, take out above-mentioned three addresses, and set up a data structure, sip agent 2 addresses are pressed in these three addresses, IP PBX public network address, the order of IP PBX private net address is put into this data structure.This process automatically performs in real time, does not need user or keeper's intervention, so just can upgrade the route messages of each ancillary equipment fast and accurately.
Same reason, IP phone are too to sip agent 1 registration.
The Media Stream acting server is set up Socket and is connected after startup, binds 200 ports, and for convenience of description, giving these port numberings here is from No. 1 port, and No. 2 ports are until No. 200 ports.Per two ports are one group, and every group of port is responsible for the forwarding of a pair of conversation.As No. 1 port and No. 2 ports is one group, and No. 1 port is responsible for passing to port then No. 2 from caller receiving media stream bag, by No. 2 ports to this media stream packets of called forwarding; No. 2 ports are responsible for passing to port then No. 1 from called receiving media stream bag, transmit this media stream packets by No. 1 port to caller.3, No. 4 ports of path are one group, are responsible for other a pair of conversation.
Call out called IP PBX as IP phone as caller this moment, receive the call request of IP phone at sip agent 1 after, transmit resource to Media Stream acting server application Media Stream, the Media Stream acting server can be told sip agent 1, says that No. 1 port and No. 2 ports can use.The SDP content that sip agent 1 is revised in the request package, the content that makes SDP is No. 1 port, transmits this request to Redirect Server then.
After Redirect Server is received the request of sip agent 1, callee's sip agent 2 addresses are returned.After sip agent 1 is received return messages, send call request to sip agent 2.
After sip agent 2 is received the call request of sip agent 1, send request to Redirect Server.After Redirect Server is received this request, return the public network address of called IP PBX, private net address to sip agent 2.After sip agent 2 is received the return messages of Redirect Server, send call request by called party instrument private net address structure to the public network address of called IP PBX.
The path that IP PBX returns to the response message process of IP phone is: IP PBX---〉sip agent 2---〉sip agent 1---〉IP phone.When response message is passed through sip agent 1, the SDP content that sip agent 1 is revised in this response message, the content that makes SDP is No. 2 ports.So far, calling and called both sides' Media Stream communication all is positioned to the Media Stream agency, that is to say that the media stream packets that IP phone is sent out directly is dealt into port No. 1, and No. 2 port is obtained this media stream packets from No. 1 port, sends to IP PBX from No. 2 ports.But the calling and called both sides also do not know these, and they just think that the Media Stream agency is the opposing party of conversation.
The conversation beginning, IP phone and IP PBX send out media stream packets to the Media Stream agency, and this bag sends with the UDP form.Media Stream agency utilizes the IP phone received and first media stream packets of IP PBX to determine that the calling and called both sides are used for the public network address that Media Stream is communicated by letter, and after begin to transmit Media Stream.
Through these steps, the also intercommunication of the signalling interworking between IP phone and the IP PBX, Media Stream.In like manner, can realize the intercommunication of signaling and Media Stream under its excess-three kind situation.
Adopt the present invention of above method,,, just can interconnect as long as make each SIP soft switch ancillary equipment meet the RFC3261 consensus standard by in the improvement aspect soft switch calling control and the Media Stream control, compatible good; Passing through NAT/Firewall that signaling and Media Stream are transparent, and the user does not know the existence of NAT/Firewall; Can pass through multi-layer NAT/Firewall; Also can pass through four kinds of NAT/Firewall of RFC3489 definition; And need not to connect the preemption passage with TCP, can save the ample resources of user, network and soft switchcall server.
Claims (3)
1.SIP call out the method for control and medium pass through private net in the soft switchcall server, by comprising public network, private network, be connected sip proxy server, Redirect Server and Media Stream acting server on the public network, the soft switchcall server that is connected the NAT/Firewall of various user terminals on the private network and connection public network private network is realized signaling and Media Stream control, it is characterized in that the concrete steps of this method are:
1) the various terminal equipments in the private network regularly send registration packet to separately acting server, comprise the private net address of terminal in this registration packet;
2) source of the registration packet sent from terminal equipment of acting server obtains the public network address of terminal, obtains the private net address of terminal from registration packet, together with the public network address of acting server, mails to Redirect Server in the lump;
3) Redirect Server is deposited these addresses in proper order by proxy server address, terminal public network address, terminal private net address;
4) calling party's acting server is revised the address in the request package when receiving the request of caller equipment, makes the sensing media server, and sends request to Redirect Server;
5) after Redirect Server is received the call request of calling party's acting server, callee's proxy server address is returned;
6) after calling party's acting server is received these return messages, send request to callee's acting server;
7) after callee's acting server is received the call request of calling party's acting server, send request, after Redirect Server is received this request, return the public network address and the private net address of called equipment to callee's acting server to Redirect Server;
8) after callee's acting server is received the return messages of Redirect Server, send the call request that has the called party instrument private net address to constitute to the public network address of called party instrument, called party instrument receives that the back beams back response packet to calling party's equipment;
9) calling party's acting server is revised called equipment and is issued address contents in the response packet of caller equipment through this acting server, making conversation point to media stream server;
10) Media Stream agency determines that by first media stream packets of the calling and called equipment received the calling and called both sides are used for the public network address that Media Stream is communicated by letter, and sets up communication, and after transmit Media Stream.
2. call out the method for control and medium pass through private net in the SIP soft switchcall server according to claim 1, wherein said Media Stream adopts the RTP RTP.
3. call out the method for control and medium pass through private net in the SIP soft switchcall server according to claim 2, wherein said media stream data bag adopts the UDP datagram form.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100802475A CN100403729C (en) | 2004-09-28 | 2004-09-28 | Method for calling control and medium pass through private net in SIP soft exchange system |
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| CNB2004100802475A CN100403729C (en) | 2004-09-28 | 2004-09-28 | Method for calling control and medium pass through private net in SIP soft exchange system |
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| CN100403729C CN100403729C (en) | 2008-07-16 |
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| CN100546285C (en) * | 2007-05-09 | 2009-09-30 | 华为技术有限公司 | Realize method, system and the Session Border Controller of Interworking gateway application layer route |
| CN101094159B (en) * | 2007-07-18 | 2010-06-09 | 中兴通讯股份有限公司 | Method for penetrating through private network of media stream |
| CN101083628B (en) * | 2007-07-20 | 2010-08-18 | 中兴通讯股份有限公司 | Method for dynamic forwarding media source |
| CN101309203B (en) * | 2007-05-17 | 2011-03-16 | 中兴通讯股份有限公司 | Network media service method |
| CN102137171A (en) * | 2010-01-22 | 2011-07-27 | 正文科技股份有限公司 | Network address translating method, translator and communication system for multimedia streaming |
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| KR100511479B1 (en) * | 2002-12-27 | 2005-08-31 | 엘지전자 주식회사 | SIP service method in network with NAT |
| US20040158606A1 (en) * | 2003-02-10 | 2004-08-12 | Mingtar Tsai | Transmission method of multimedia data over a network |
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| CN101309203B (en) * | 2007-05-17 | 2011-03-16 | 中兴通讯股份有限公司 | Network media service method |
| CN101094159B (en) * | 2007-07-18 | 2010-06-09 | 中兴通讯股份有限公司 | Method for penetrating through private network of media stream |
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Also Published As
| Publication number | Publication date |
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| CN100403729C (en) | 2008-07-16 |
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