CN100596093C - Implementing method of intelligent media flow bypass - Google Patents
Implementing method of intelligent media flow bypass Download PDFInfo
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- CN100596093C CN100596093C CN200510072101A CN200510072101A CN100596093C CN 100596093 C CN100596093 C CN 100596093C CN 200510072101 A CN200510072101 A CN 200510072101A CN 200510072101 A CN200510072101 A CN 200510072101A CN 100596093 C CN100596093 C CN 100596093C
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Abstract
This invention relates to a method for realizing by-pass intelligent media flow including: a calling and a called terminals get the actual IP address and a port of the opposite end separately by a proxy device and carry out media flow by-pass operation based on the actual IP address and port of the opposite.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of implementation method of intelligent media flow bypass.
Background technology
Moving communicating field is one of most hotly competitive in recent years industry, telecom operators more and more need the business of otherness to improve its competitiveness, with soft switch and packet-switch technology is NGN (next generation network) technology of core, because it has broad application prospects and can satisfy people's variation, personalized business demand, become one of focus that industry pays close attention to most.Streaming Media is a kind of network multimedia form of rising in recent years.Under stream media technology is supported, develop into the stream transmission mode by in the past downloading mode at multimedia messagess such as transmission over networks video and audio frequency.
PROXY (agency) equipment is one of visual plant among the NGN, is exactly server for the terminal use PROXY among the NGN, is exactly terminal for the Core server PROXY among the NGN.The typical networking pattern diagram of PROXY in the NGN network as shown in Figure 1.General PROXY is made up of Xin Lingdaili and Media proxy:
1, Xin Lingdaili (Signalling Proxy is called for short SP)
Xin Lingdaili among the PROXY is handled is message such as terminal use's registration and calling.Message such as terminal use's registration and calling are sent to PROXY earlier, and PROXY is transmitted to the core soft switchcall server through after the signaling process.After the core soft switchcall server is handled accordingly, message such as the registration of receiving and calling are returned to PROXY, PROXY is transmitted to real called subscriber again through after the signaling process.General PROXY need support SIP (initial session protocol), H.323, MGCP (media gateway controlling part), H.248 wait one or more agent functionalitys in the agreement.Because PROXY has participated in the whole signaling handling process, so PROXY can obtain details such as corresponding user's registration, calling in the signaling.
2, Media proxy (Media Proxy is called for short MP)
PROXY also carries out the agency of Media Streams such as terminal use's video and audio frequency.All terminal uses that PROXY acted on behalf of and the Media Stream of extraneous intercommunication all pass through PROXY and handle and transmit.As the terminal use under the PROXY during as caller, that is seen calledly is PROXY, and the called address that the calling subscriber sees is the address of PROXY.
The signaling flow among the PROXY and the transmission schematic diagram of Media Stream are as shown in Figure 2.
Terminal use's signaling flow is handled to server by PROXY, and Media Stream also carries out transfer by PROXY simultaneously.
In the prior art, the Media Stream Bypass technology has appearred.The Media Stream Bypass technology is exactly that terminal use's Media Stream transmits by the network that connects them, and no longer handles through Proxy equipment.Directly intercommunication between terminal of Media Stream just.The schematic diagram that the terminal use carries out Media Stream Bypass as shown in Figure 3.
The main feature of Media Stream Bypass technology of the prior art is: on Proxy equipment, be configured in the same Media Stream Bypass rule by the user ID of user's configuration, between terminal 1 and terminal 2, force to realize the Media Stream Bypass rule terminal 1 and terminal 2.
The shortcoming of described Media Stream Bypass technology of the prior art is:
1, need know the user ID of carrying out the Media Stream Bypass both sides in advance.Therefore, increase the difficulty of user's operation in realization, weakened its operability on using.
2, can't guarantee to carry out the bipartite network interworking of Media Stream Bypass.Because end user device separates on network with Proxy equipment, sometimes can't guarantee and carry out network interworking between the end user device of the other end of Media Stream Bypass at the end user device of Proxy one end, so, if force they are configured to Media Stream Bypass, to cause the success of two terminal room Signalling exchanges, but the media flow transmission failure.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of implementation method of intelligent media flow bypass, can automatically discern the whether network interworking of both sides that need carry out Media Stream Bypass, and automatically realize the Media Stream Bypass function.
The objective of the invention is to be achieved through the following technical solutions:
A kind of implementation method of intelligent media flow bypass comprises:
A, the message that sends at calling terminal or terminal called are with up direction during by agent equipment, described agent equipment is resolved the source IP address that IP heading in the described message is obtained described calling terminal or terminal called, resolves application layer messages and obtains the described calling terminal among the message protocol data cell PDU or the real ip address and the port of terminal called; The described calling terminal that described agent equipment will obtain or the real ip address of terminal called and port, source IP address and agent equipment are that up going port address and the port that the message of described calling terminal or terminal called transmission distributes is kept in the Media Stream Bypass table; Described agent equipment is replaced the real ip address and the port of terminal among the message PDU that described calling terminal or terminal called send with described up going port address and port, and sends the message that described calling terminal or terminal called send to server;
B, the message that returns at described server is with descending direction during by agent equipment, described agent equipment is an index with terminal address and the port of describing among this message PDU, search described Media Stream Bypass table, confirm to exist the respective record item identical in the described Media Stream Bypass table with this index, and when the source IP address that writes down in purpose IP address and the described respective record item in the IP heading in the described message is identical, described agent equipment takes out the described calling terminal that writes down in the described respective record item or the real ip address and the port of terminal called, and replace source IP address and port among the described message PDU with them, then this message is sent to the terminal called or the calling terminal of opposite end.
Described calling terminal and terminal called are to be registered on the same agent equipment.
Described agent equipment confirms that calling terminal and terminal called are to be positioned under the same web site changing NAT device.
The message that described calling terminal sends comprises: the calling message that comprises the business datum dot information that calling terminal sends to terminal called;
The message that described terminal called sends comprises: the response message that comprises the business datum dot information that terminal called sends to calling terminal.
Described step B also comprises:
The terminal called of opposite end or calling terminal obtain the real ip address and the port of described calling terminal or terminal called according to source IP address and port among the message PDU that receives.
Described method is applicable to next generation network NGN.
As seen from the above technical solution provided by the invention, the present invention compares with prior art, have following advantage: the present invention does not revise the terminal media stream address information of carrying in the signaling message by Proxy, directly original Media Stream address information is passed to Correspondent Node, avoided user's configure Media Stream Bypass rule, realized that the terminal use automatically carries out the function of Media Stream Bypass; The present invention need carry out the whether network interworking of both sides of Media Stream Bypass by identification automatically, the terminal of having avoided carrying out Media Stream Bypass by force is arranged in the Media Stream Bypass rule group, and cause Signalling exchange successful, the consequence of media flow transmission failure.
Description of drawings
Fig. 1 is the typical networking pattern diagram of PROXY in the NGN network;
Fig. 2 is the signaling flow among the PROXY and the transmission schematic diagram of Media Stream;
Fig. 3 carries out the schematic diagram of Media Stream Bypass for the terminal use;
The schematic diagram of Fig. 4 for calling out by PROXY and server between the terminal use;
Concrete process chart when Fig. 5 PROXY receives from the calling message of up direction;
Concrete process chart when Fig. 6 PROXY receives from the calling message of up direction;
Fig. 7 is the call treatment particular flow sheet of Calling Side among the embodiment of the present invention;
Fig. 8 is the call treatment particular flow sheet of callee side among the embodiment of the present invention.
Embodiment
The invention provides a kind of implementation method of intelligent media flow bypass.Core of the present invention is: by automatic recording medium stream bypass table, Proxy does not revise the terminal actual address information of carrying in the signaling message, and directly the terminal address information with reality passes to Correspondent Node.
The present invention is adapted at realizing on the PROXY equipment, but is not limited to special-purpose PROXY equipment, also can realize the present invention on other possesses the equipment of PROXY function.Simultaneously, to require to carry out the both call sides of Media Stream Bypass all must be to register on same PROXY equipment in the present invention.
When carrying out Media Stream Bypass, need consult the address of Media Stream between the terminal use by signaling protocol.Under the situation that has PROXY to participate in, PROXY can change to terminal use's Media Stream address the address of PROXY.Therefore realize that the key of Media Stream Bypass is not revise the Media Stream address information that the terminal use carries in signaling message, directly original Media Stream address information is passed to Correspondent Node.
The schematic diagram of calling out by PROXY and server between the terminal use as shown in Figure 4.Terminal 2 is caller among Fig. 4, and terminal 1 is called.At first, terminal 2 sends call request to terminal 1, and this request is with the up direction PROXY equipment arrival server of flowing through; Then, server is transmitted to PROXY with this call request, with the down direction incoming terminal 1 behind the PROXY of flowing through.Then, terminal 1 is returned call to terminal 2, and this call arrives server with the up direction PROXY equipment of flowing through; At last, server is transmitted to PROXY with this call, and flowing through with down direction reaches terminal 2 behind the PROXY.
In above-mentioned calling procedure, PROXY is with the calling message of receiving respectively from up direction and down direction, when the present invention receives calling message from up direction and down direction at PROXY, increased some processing procedures respectively, realized original Media Stream address information is passed to Correspondent Node.Introduce PROXY handles message at up direction and down direction process below respectively.
Concrete process chart when PROXY receives from the calling message of up direction as shown in Figure 5.Comprise the steps:
Step 5-1, PROXY receive the calling message of up direction.
PROXY equipment is received the calling message of the up direction of the terminal use's transmission that makes a call, i.e. IP message.
Step 5-2, parsing IP message take out the heading source IP address.
PROXY resolves the IP heading in the uplink message of receiving, obtains the source IP address that sends the terminal use, i.e. NAT (web site changing) device network side address.
Step 5-3, parsing application layer message take out source IP address and port among the PDU.
After the IP heading in the PROXY parsing uplink message, resolve application layer messages in the uplink message then, obtain PDU message source IP address and PDU message source Port (port) among the PDU (protocol Data Unit), promptly send terminal real IP address and port.Then, PROXY equipment can distribute up going port address and port for this up call message.
Step 5-4, obtain the calling up going port address and the port of PROXY devices allocation.
PROXY equipment is retrieved as up going port address and the port that this up call message distributes, and this address and port are PROXY translation proxy IP address and PROXY translation proxy port.
Step 5-5, IP source address, PDU source IP address and port, PROXY up going port address and port are write in the Media Stream Bypass table.
The present invention need write down a Media Stream Bypass table in PROXY, project and implication thereof in this Media Stream Bypass table are as shown in table 1.
Table 1 Media Stream Bypass table
After PROXY has obtained source IP address, terminal real IP address, the true Port of terminal, PROXY translation proxy IP address and PROXY translation proxy port by step 5-2,5-3 and 5-4, they are inserted respectively in the relevant item of the Media Stream Bypass table shown in the table 1.
Step 5-6, will call out that PDU source IP address and port change to PROXY up going port address and port in the message.
The PROXY handling process will be called out PDU message source IP address in the message, PDU message source Port converts up going port address and the port that PROXY distributes to.
Step 5-7, continuation call treatment.
PROXY should call out message and mail to server.
Concrete process chart when PROXY receives from the calling message of down direction as shown in Figure 6.Comprise the steps:
Step 6-1, PROXY receive the calling message of down direction.
PROXY equipment is received the calling message of the down direction that server sends over.
Step 6-2, parsing application layer message take out source IP address and port among the PDU.
After PROXY equipment is received the calling message of the down direction that server sends over, resolve application layer messages in the calling message of this down direction, obtain in the message of this down direction source IP address and port among the PDU.
Step 6-3, judge whether the up IP mouth of PROXY IP address and peer-port field record in the Media Stream Bypass table.
PROXY is an index with source IP address and port among the PDU that obtains, and searches the Media Stream Bypass table, judges whether to exist the PROXY translation proxy IP address of list item identical with its value with PROXY translation proxy port.If exist, then write down the list item that checks in, execution in step 6-4 then; Otherwise, execution in step 6-8.
IP heading purpose IP address in the calling message that step 6-4, taking-up will issue.
PROXY thinks this calling message from another terminal of registering under the same PROXY equipment, and then, PROXY takes out the purpose IP address in the IP stem in this calling message again.
Step 6-5, judge whether this IP address is identical with IP heading source IP address in the above-mentioned Media Stream Bypass list item.
PROXY is an index with the purpose IP address that obtains, and searches the Media Stream Bypass list item of described record, judges whether the value of source IP address item record in this list item is identical with its value.If identical, execution in step 6-6 then; Otherwise, execution in step 6-8.
PDU source IP address and port in step 6-6, the above-mentioned Media Stream Bypass list item of taking-up, and cover PDU source IP address and port in the calling message.
PROXY thinks that two terminals of calling out are to hang under the same NAT device network interworking.Both PROXY thought that two terminals of calling out satisfied the Media Stream Bypass rule.So PROXY replaces source IP address and the port (this moment, its value was the up IP mouth of PROXY IP address and port) called out among the message PDU with the value of terminal real IP address and the true Port of terminal in the above-mentioned Media Stream Bypass list item.Then, execution in step 6-7.
Step 6-7, proceed call treatment, and set up Media Stream Bypass.
PROXY should call out message and mail to receiving terminal.Like this, receiving terminal can obtain to send the real IP address and the port of terminal according to source IP address and port among this calling message PDU.Receiving terminal can carry out the Media Stream Bypass operation with the transmission terminal according to the real IP address and the port of the transmission terminal that obtains.
Step 6-8, handle by ordinary call.
If there is no in the Media Stream Bypass table among the PROXY translation proxy IP address of list item and PROXY translation proxy port and the PDU that PROXY obtains source IP address identical with port, then PROXY thinks that the both sides that call out are not under same NAT device, promptly both sides' network of Hu Jiaoing is obstructed, continues to handle this calling by the ordinary call processing mode.
For describing the method for the invention better, it is example that the present invention calls out with SIP (initial session protocol), provides an embodiment who realizes the method for the invention, in this embodiment, the call treatment idiographic flow of Calling Side (SIP-UE1) comprises the steps: as shown in Figure 7
After step 72, NAT device receive Invite message, changing its IP source address (R1 operation), is I2 through its IP layer source address of Invite message after the conversion, and PDU address and port are constant.
After step 73, PROXY equipment receive Invite message, change its PDU address and port (R2 operation), through the conversion after its IP layer source address of Invite message be I2, PDU address and port be (I4, P4).Simultaneously, and PROXY equipment general (I2, I1, P1, I4 P4) is filled in the Media Stream Bypass table as parameter.
Step 74, PROXY equipment receive that PDU address and the port from back message using 183,183 message of opposite end transmitted through Server are (I4 ', P4 ').PROXY is an index search Media Stream Bypass table with (I4 ', P4 '), checks in record (I2, I1 ', P1 ', I4 ', P4 ').
So whether the IP layer purpose IP address that PROXY equipment is observed 183 message again is I2.If then PROXY equipment takes out (I1 ', P1 ') and covers the PDU source address of 183 message and port (I4 ', P4 ') from the Media Stream Bypass list item that checks in record.
183 forwards that step 76, NAT will receive are given SIP-UE1, and at this moment, PDU source address and port are (I1 ', P1 ') in 183 message.So Calling Side can be from 183 message that receive, and acquisition callee side true address and port (I1 ', P1 '),, can carry out the Media Stream Bypass operation between Calling Side and the callee side according to this callee side true address and port.
In this embodiment, the call treatment idiographic flow of callee side (SIP-UE2) comprises the steps: as shown in Figure 8
Step 81, Server will give PROXY equipment from the Invite forwards of caller, and wherein the PDU address of Invite and port are (I4, P4) (referring to Fig. 7 step 73).
Step 82, PROXY equipment are carried out the R1 operation, with (I4 is an index search Media Stream Bypass table P4), check in record (I2, I1, P1, I4, P4).Then, PROXY equipment judges whether the purpose IP address of this Invite is I2 again, if, then PROXY equipment take out in the list item (I1, P1) cover PDU source address port (I4, P4).PROXY sends to NAT device with new Invite message;
Step 83, NAT device are given SIP-UE2 with the Invite forwards that receives, in this Invite message PDU address and port be (I1, P1), so, after callee side receives this Invite message, can obtain the true address of calling terminal and port (I1, P1).
Step 84, SIP-UE2 are receiving the Invite message that Calling Side is initiated, after obtaining the true address and port of calling terminal, return 183 message to Calling Side, IP layer source address is I1 ' in this message, PDU address and port are the true address of terminal called and port (I1 ', P1 ').
After step 85, NAT device receive 183 message, its IP layer address is changed to I2 ' (R3 operation), PDU source address and port remain unchanged, and give PROXY equipment with 183 forwards then.
After step 86, PROXY equipment are received 183 message, its PDU source address and port are changed to (I4 ', P4 ') (R4 operation), recording medium stream bypass table (I2 ', I1 ', P1 ', I4 ', P4 '), then this message is sent to Server.
So far, the concrete handling process of the method for the invention finishes.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (6)
1, a kind of implementation method of intelligent media flow bypass is characterized in that, comprising:
A, the message that sends at calling terminal or terminal called are with up direction during by agent equipment, described agent equipment is resolved the source IP address that IP heading in the described message is obtained described calling terminal or terminal called, resolves application layer messages and obtains the described calling terminal among the message protocol data cell PDU or the real ip address and the port of terminal called; The described calling terminal that described agent equipment will obtain or the real ip address of terminal called and port, source IP address and agent equipment are that up going port address and the port that the message of described calling terminal or terminal called transmission distributes is kept in the Media Stream Bypass table; Described agent equipment is replaced the real ip address and the port of terminal among the message PDU that described calling terminal or terminal called send with described up going port address and port, and sends the message that described calling terminal or terminal called send to server;
B, the message that returns at described server is with descending direction during by agent equipment, described agent equipment is an index with terminal address and the port of describing among this message PDU, search described Media Stream Bypass table, confirm to exist the respective record item identical in the described Media Stream Bypass table with this index, and when the source IP address that writes down in purpose IP address and the described respective record item in the IP heading in the described message is identical, described agent equipment takes out the described calling terminal that writes down in the described respective record item or the real ip address and the port of terminal called, and replace source IP address and port among the described message PDU with them, then this message is sent to the terminal called or the calling terminal of opposite end.
2, the implementation method of intelligent media flow bypass according to claim 1 is characterized in that, described calling terminal and terminal called are to be registered on the same agent equipment.
3, the implementation method of intelligent media flow bypass according to claim 1 and 2 is characterized in that, described agent equipment confirms that calling terminal and terminal called are to be positioned under the same web site changing NAT device.
4, according to the implementation method of the described intelligent media flow bypass of claim 1, it is characterized in that:
The message that described calling terminal sends comprises: the calling message that comprises the business datum dot information that calling terminal sends to terminal called;
The message that described terminal called sends comprises: the response message that comprises the business datum dot information that terminal called sends to calling terminal.
According to the implementation method of each described intelligent media flow bypass of claim 1 to 4, it is characterized in that 5, described step B also comprises:
The terminal called of opposite end or calling terminal obtain the real ip address and the port of described calling terminal or terminal called according to source IP address and port among the message PDU that receives.
According to the implementation method of the described intelligent media flow bypass of claim 1, it is characterized in that 6, described method is applicable to next generation network NGN.
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| CN200510072101A CN100596093C (en) | 2005-05-24 | 2005-05-24 | Implementing method of intelligent media flow bypass |
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| CN200510072101A CN100596093C (en) | 2005-05-24 | 2005-05-24 | Implementing method of intelligent media flow bypass |
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| CN1870567A CN1870567A (en) | 2006-11-29 |
| CN100596093C true CN100596093C (en) | 2010-03-24 |
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| CN101656715B (en) * | 2008-08-21 | 2013-04-17 | 华为技术有限公司 | Method, system and device for media bypass |
| CN103139156B (en) * | 2011-11-28 | 2016-09-07 | 中国移动通信集团公司 | A kind of Media Stream Bypass implementation method and equipment |
| CN114978440B (en) * | 2022-05-24 | 2023-09-12 | 北京立华莱康平台科技有限公司 | Data processing method and device for network conduction |
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