CN100589484C - Bearing system and method for media network gate control protocol - Google Patents
Bearing system and method for media network gate control protocol Download PDFInfo
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- CN100589484C CN100589484C CN200510110889A CN200510110889A CN100589484C CN 100589484 C CN100589484 C CN 100589484C CN 200510110889 A CN200510110889 A CN 200510110889A CN 200510110889 A CN200510110889 A CN 200510110889A CN 100589484 C CN100589484 C CN 100589484C
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Abstract
Being related to technique for carrying communication protocol, the invention discloses system and method for carrying media gateway control protocol in order to implement carrying control protocol between MGC and MGW more reliably. Through increasing communication function of multiple IP addresses, the invention can establish multiple UDP or TCP transmission links between MGC and MGW to carry media gateway control protocol. Thus, if message sent from one UDP or TCP transmission link does not obtain response in prearranged time length, then re-transmission can be carried out through another UDP or TCP transmission link. In addition, load can be partaken among transmission links in UDP or TCP.
Description
Technical field
The present invention relates to the bearing technology of communication protocol, particularly the bearing technology of communication protocol in carrying and the network that control separates.
Background technology
Along with development of Communication Technique, communication network is also to next generation network (Next GenerationNetwork, be called for short " NGN ") evolution rapidly, and wherein, the trend of switching technology development is that professional control and carrying media are separated.By separating of business control and carrying media, the user can dispose and define the service feature of oneself voluntarily and needn't be concerned about the latticed form and the terminal type of bearer service, feasible business and the bigger flexibility that provides of using, thereby satisfy the business demand that the user is constantly developed renewal, also make network possess extensibility and quick ability of disposing new business, make Virtual network operator more competitive.
In order to realize separating of professional control and carrying media that traditional switch is divided into Media Gateway Controller (Media Gateway Controller is called for short " MGC ") and media gateway (Media GateWay is called for short " MGW ") two parts.Wherein, MGC is used to realize the management of call state, and to the control of MGW bearing resource; MGW is used to finish foundation, modification, release and the resource management of concrete Media Stream, can with the media stream transition in one type the network the desired form of another kind of network, for example the E1 time slot in the Circuit Switching Network is converted to internetworking agreement (Internet Protocol, abbreviation " IP ") RTP in the network (Real-Time Transfer Protocol is called for short " RTP ") stream.
Can use H.248 agreement as control protocol between MGC and the MGW.Wherein, H.248 agreement is by (the International Telecommunication UnionTelecommunication Standardization Sector of ITU Telecommunication Standardization Sector, be called for short " ITU-T ") and the Internet engineering duty group (Internet Engineering Tast Force, be called for short " IETF ") the common formulation, it is a kind of bearer control protocol, usually be carried on asynchronous transfer mode (Asynchronous Transfer Mode is called for short " ATM ") or the IP network.In the time of on being carried on atm network, H.248 can use message transfer part layer 3 (broadband) (Message Transfer Part layer 3 (broadband), abbreviation " MTP3B "), Service Specific Connection Oriented Protocol (Service Specific Connection OrientedProtocol, be called for short " SSCOP ")/agreements such as ATM Adaption Layer Type 5 (ATM Adaptation Layer type5 is called for short " AAL5 "), ALF/ALL5 are as the bottom signaling bear; In the time of on being carried on IP network, H.248 can use transmission control protocol (Transfer Control Protocol, abbreviation " TCP "), User Datagram Protoco (UDP) (User Datagram Protocol, abbreviation " UDP "), SCTP agreements such as (Stream Control Transmission Protocol are called for short " SCTP ") is as the bottom signaling bear.
According to agreement H.248.1, title or the address of a main MGC need be provided to MGW, DNS (DOMAIN NAME SYSTEM for example, be called for short " DNS ") title or IP address, in addition, as option, can also provide name or the address of zero or a plurality of standby MGC to MGW.MGW will send message to the MGC of appointment, and MGC can obtain the address of MGW from the registration message (Service Change) of MGW.
IP network is minimum as the transmission cost of bearer network, therefore also makes with the most use in actual networking.In IP network, use the most general transport layer protocol and be connection-oriented Transmission Control Protocol and towards connectionless udp protocol.
When using TCP as H.248 transport layer protocol, because TCP is a Connection-oriented Protocol, must set up TCP between MGC and MGW is connected, the both sides that socket (socket) DLL (dynamic link library) requires use TCP to communicate, can know the other side's IP address and port numbers, and communication is carried out in also can only connecting at the TCP that four-tuple identified.Wherein, four-tuple is source IP address, source port number, target ip address, destination port number.
The typical case that TCP connects sets up process and is: MGC monitors (Listen) as service (Server) end on the IP address of appointment and port; MGW selects the IP address and the port numbers of local terminal according to the configuration data of oneself, sends TCP connection request (Connect) to this MGC listen address; This request (Accept) is accepted in MGC decision, sends to the IP address of the MGW that sends the TCP connection request and port numbers and replys; MGW confirms that this replys, and the three-way handshake of TCP is finished, and TCP connects foundation.Both sides can begin communication subsequently, and MGW sends registration message (ServiceChange) on this connects.
Because TCP is reliable transport protocol, the information of transmission must obtain the other side's affirmation, if overtime can not get confirm, will retransmit these information.So just cause a problem, if the bearer network poor quality, packet loss is serious, and throughput and response time that TCP connects will worsen rapidly.Standard TCP realize to be with the retransmit interval of calculating bag two-way time, and follows the re-transmission principle of exponential backoff, and promptly along with the increase of number of retransmissions, retransmission time interval is more and more longer.A typical TCP retransmission sequence is: after retransmitting 1.5 seconds that occur in the no response frame for the first time, later is 3 seconds, 6 seconds, 12 seconds, 24 seconds, 48 seconds, a plurality of 64 seconds at interval, and wherein, 64 seconds is the maximum retransmit interval.Retransmit to TCP from the 1st time and abandon retransmitting and interrupting connection, approximately need 9 minutes.In addition, because Transmission Control Protocol is flow host-host protocol, all bags all are mapped to the stream of non-boundary in the TCP connection at last, and previous bag can't transmission success, will cause the follow-up bag all can't transmission success.This specific character of TCP is browsed service for internet (Internet) and is fit to, but for be responsible for call signaling control H.248, its real-time requires can't be met far away.
When using UDP as H.248 transport layer protocol, because UDP is a connectionless protocol, so needn't explicitly connect between MGC and the MGW, only need know the other side's IP address and port numbers, can send information to the other side at any time.
But because UDP is unreliable host-host protocol, it also makes transmit leg can't know the other side's state towards connectionless characteristic, and the machine even the other side delays also can only infer that the other side is unreachable after repeatedly retransmitting failure.Therefore for be responsible for call signaling control H.248, its real-time requires also can't be met.
From the reliability of communication equipment itself, adopt distributed treatment, same function is distributed on the entity of a plurality of load sharings, help the reliability of enhanced system.For example use a plurality of IP communication interface boards, have IP address separately respectively, when then a communication interface board breaks down, the unlikely interruption that causes the whole system correspondence with foreign country.This just requires to support the communication of many IP address between MGC and MGW.
For the communication of many IP address, the prior art scheme is used SCTP conduct transport layer protocol H.248.
Stream Control Transmission Protocol allows in a plurality of IP address of source end (using 1 port numbers), and sets up SCTP between a plurality of IP address (using 1 port numbers) of destination end and is connected.When the load-bearing network quality deterioration, when packet loss took place, SCTP can attempt alternative IP address automatically, and this will change the routing strategy that IP wraps, thereby might avoid local router failure, arrive the destination smoothly.
When H.248 being carried on the Stream Control Transmission Protocol, can utilize the support of SCTP to many IP address, port numbers, improve the real-time and the reliability of H.248 signaling transmission.
In actual applications, there is following problem in such scheme: the agreement of prior art scheme realizes more complicated, expense is bigger, and system resource can't be born when MGW quantity is big, and the prior art scheme does not support to use the MGCP agreement as the control protocol between MGC and MGW.
Cause the main cause of this situation to be, the Stream Control Transmission Protocol realization that the prior art scheme is used is compared complicated more with TCP, udp protocol, and protocol overhead is big.And because the quantity of MGW may be very big, even might reach more than 1,000,000, at this moment the requirement for system resource is implacable, in addition, because MGCP also can be used as the control protocol between MGC and MGW, and the MGCP agreement can only be carried on the udp protocol, and the prior art scheme just can't be used under this scene.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of bearing system and method thereof of MGCP, make that the carrying realization of control protocol is simpler between MGC and MGW, more pare down expenses and system resource, can also support the carrying of MGCP agreement simultaneously.
For achieving the above object, the invention provides a kind of bearing system of MGCP, comprise Media Gateway Controller and at least one media gateway that belongs to this Media Gateway Controller, described Media Gateway Controller is connected by the IP protocol network with described media gateway, described Media Gateway Controller also comprises at least two communication interfaces with different IP protocol address, and utilizes these communication interfaces to set up at least two transmission links that are used to carry described control protocol with described media gateway respectively;
Described Media Gateway Controller also is used to monitor the state of each described transmission link, when finding the transmission link fault, attempt rebuilding this transmission link, and select the normal transmission link of other state, so that transfer medium gateway control protocol message is given described media gateway.
Wherein, described media gateway also is set at least two IP protocol address of described Media Gateway Controller configuration according to system, and set up at least two transmission links between described Media Gateway Controller, when receiving described MGCP message, reply response message.
In this external described system, described transmission link uses transmission control protocol or User Datagram Protoco (UDP).
In this external described system, when described transmission link uses transmission control protocol, described Media Gateway Controller is monitored the state of described transmission link according to the described response message of described media gateway, if after sending described MGCP message on the transmission link, do not receive the response message of described media gateway at the appointed time, then judge this transmission link fault.
In this external described system, described Media Gateway Controller according to the described response message of described media gateway and and described media gateway between the shake hands state of the described transmission link of monitoring of timing, if regularly shake hands failure or on same transmission link the described MGCP message of continuous retransmission surpass thresholding, then judge this transmission link fault.
In this external described system, described Media Gateway Controller also is that described transmission link distributes priority, and preferentially uses the high available transmission link of priority.
In this external described system, described Media Gateway Controller is also according to the principle of load sharing, and the MGCP distribution of messages that difference is called out is to different transmission links.
In this external described system, described media gateway also comprises at least two communication interfaces, and the communication interface of described Media Gateway Controller and described media gateway is set up described transmission link in twos.
In this external described system, described MGCP is H.248 agreement or MGCP agreement.
The present invention also provides a kind of bearing method of MGCP, is applied to system mentioned above, comprises following steps:
Media Gateway Controller or media gateway are passed through a current normal transmission link after the opposite end sends MGCP message, if in the time of presetting length, do not receive the response message of answer, then in other normal transmission link, select one and send this MGCP message once more.
Wherein, when described Media Gateway Controller or media gateway need send MGCP message, from current normal each transmission link, select a transmission at random.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, by increasing the function of the many IP address communication between MGC and the MGW, can between MGC and MGW, set up many UDP or TCP transmission link carrying media gateway control protocol, if one the message that sends on TCP or the UDP transmission link does not meet with a response in scheduled duration, then send once more by another TCP or UDP transmission link.Can between each bar TCP or UDP transmission link, realize load sharing in addition.
Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly at first, because control protocol use TCP or UDP carrying between MGC and MGW among the present invention program, and the expense of TCP and udp protocol is significantly smaller than Stream Control Transmission Protocol, therefore realize also simplyr, can reduce the consumption of protocol overhead and system resource greatly.
Second, the present invention program can set up many TCP or UDP transmission link between MGC and MGW, the excessive situation of time delay that may occur when having avoided independent use wall scroll TCP or UDP link has guaranteed the real-time and the reliability of control protocol transmission of messages between MGC and MGW.
The 3rd, the present invention can use the control protocol between UDP carrying MGC and MGW, therefore not only supports H.248 agreement, can also support the MGCP agreement, has effectively avoided prior art to use the Stream Control Transmission Protocol carrying can't support the defective of MGCP agreement.
The 4th, load sharing has strengthened the reliability of system.
Description of drawings
Fig. 1 is the composition schematic diagram of control protocol MGCP bearing system between the MGC of the better embodiment according to the present invention and MGW;
Fig. 2 is the flow chart of control protocol carrying between the MGC of the better embodiment according to the present invention and MGW.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Compare with SCTP, the application of TCP and udp protocol is more extensive, agreement realizes simpler, system resources consumption also still less, the present invention is carried on the control protocol between MGC and MGW on TCP or the UDP, time delay for fear of TCP or udp protocol transmission is uncontrollable unreliable with transmission, the present invention also increases the function of many IP address communication on MGC, and corresponding be that a MGC disposes a plurality of IP address at the MGW place, utilize the function of many IP address communication to set up real-time and reliability that many TCP or UDP transmission link guarantee control protocol carrying between MGC and MGW.
The control protocol bearing system comprises MGC and at least one and belongs to the MGW of this MGC between MGC and MGW, connects by IP network between MGC and the MGW.
MGC comprises a plurality of IP communication interface boards with different IP addresses, the MGW that is used for and belongs to this MGC sets up many TCP or UDP transmission link, monitor the state of these transmission links, when the transmission link fault of current use, rebuild this transmission link, and select another transmission link to transmit the message of control protocol between MGC and MGW.
When setting up the TCP transmission link between MGW and the MGC, MGC is according to the response message monitoring TCP transmission link state of MGW; When setting up the UDP transmission link between MGW and the MGC, MGC according to the response message of MGW and and MGW between the timing monitoring UDP transmission link of shaking hands.
MGC can also use different TCP or UDP transmission link to transmit different control protocol message of calling out according to the load sharing principle.
The MGC that MGW is used for being set to according to system its ownership disposes a plurality of IP address, sets up many TCP or UDP transmission link when powering on, and replys response message when receiving the message of MGW.
In order to provide more TCP or UDP transmission link with further raising message transmission reliability, MGW can also comprise a plurality of IP communication interface boards with different IP addresses, MGC also preserves a plurality of IP address for the MGW of its administration, and the IP communication interface board of the IP communication interface board of MGW and its ownership MGC is set up TCP or UDP transmission link between any two respectively.
Between the present invention and MGC and MGW between the MGC of control protocol bearing system correspondence and MGW the control protocol bearing method comprise following steps:
For MGC disposes two or more IP communication interface boards and corresponding IP address, and two or more IP addresses that dispose this MGC for the MGW that belongs to this MGC;
Set up two or more transmission links when MGW powers on and between ownership MGC;
MGC uses transmission link to send control protocol message to MGW;
The state of MGC monitoring transmission link selects other transmission link to send control protocol message to MGW and rebuild the transmission link of abnormal state when the transmission link abnormal state.
Wherein, the transport layer protocol of transmission link is TCP or UDP.
Illustrate the present invention program in order better to illustrate below in conjunction with better embodiment of the present invention.
The composition of control protocol bearing system is as shown in Figure 1 between the MGC of better embodiment and MGW according to the present invention.
The control protocol bearing system comprises MGC 10 and at least one belongs to the MGW 20 of this MGC 10 between MGC and MGW, connects by IP network between MGC 10 and the MGW 20.
Wherein, MGC 10 also comprises two IP communication interface board 30-1 and 30-2, MGC 10 is used for providing all functions of prior art MGC, also be used for when the MGW of its administration powers on and this MGW sets up many transmission links, monitor the state of these transmission links, when the transmission link fault of current use, rebuild this transmission link, and select another transmission link to transmit control protocol message.Wherein, transmission link can use Transmission Control Protocol or udp protocol, and a transmission link has unique four-tuple, i.e. the IP address of the port numbers of the IP address of MGC, MG, MGW and the port numbers of MGW.Need to prove that for the succession that guarantees that the same call signaling transmits, the control protocol message of same call transmits, unless this transmission link fault on same transmission link.
20 control protocols of MGC 10 and MGW can be agreements H.248, transmission link can use Transmission Control Protocol, Transmission Control Protocol is a kind of Connection-oriented Protocol, the information that transmits must obtain the other side's affirmation, if overtime can not get confirmed, will retransmit these information, for real-time and the reliability that guarantees control protocol message, if MGC 10 does not receive the response message of MGW 20 at the appointed time among the present invention, then the TCP transmission links of preceding use are set at fault and rebuild a bit, use other TCP transmission link to retransmit control protocol message simultaneously.
20 control protocols of MGC 10 and MGW also can be H.248 agreement or MGCP agreement, transmission link also can use udp protocol, MGC 10 by and MGW 20 between carry out timing and shake hands and safeguard the transmission link state, the failure or after repeatedly retransmitting control protocol message on the UDP of the current use transmission link, can not receive response if regularly shake hands, then the UDP transmission link of current use is set at fault and rebuilds, use other UDP transmission link to retransmit control protocol message simultaneously.Wherein, can not receive response after repeatedly retransmitting control protocol message on the current use UDP transmission link is meant, if MGC10 does not receive response at the appointed time after sending control protocol message on this UDP transmission link, then retransmit this message, if still do not receive response at the appointed time, then repeat aforesaid operations and exceed set point number until retransmitting number of times.Need to prove that the UDP transmission link is virtual connection, different with the TCP connection, do not need special-purpose connection foundation and demolishing process.
MGW 20 is used for providing all functions of prior art MGW, also is used for being set to according to system a plurality of IP of the MGC 10 configurations address of its ownership, sets up many transmission links when powering on, and replys response message when receiving the message of MGC 10.Wherein, MGW 20 is chosen in the transmission link complex response last time message of receiving message as far as possible.Need to prove, MGW 20 is a plurality of IP of the MGC 10 configurations address of its ownership among the present invention program, many transmission links of a plurality of IP address correspondence all are connected to same ownership MGC, when the accidental interruption of a transmission link, can also use other transmission link to be connected with MGC10, connection between MGW 20 and the MGC 10 is not interrupted, and still can guarantee the reliable transmission of message, and this and prior art scheme have essential distinction.In the prior art scheme, though H.248 agreement allows for the address that same MGW disposes a plurality of MGC, this is used for many ownership functions, and these addresses belong to different MGC, so that after the MGC collapse that MGW finds oneself to belong to, can initiate registration again to another standby MGC.MGW switches between a plurality of MGC and can cause professional interruption, and this is a kind of disaster recovery measure, and accidental sudden strain of a muscle that obviously is not suitable for the signaling bear net broken.
In better embodiment of the present invention, MGW 20 also comprises two IP communication interface board 30-3 and 30-4, this can set up more transmission link between MGC 10 and MGW 20, further improve the reliability and the real-time of MGC 10 and 20 control protocol transmission of messages of MGW, those of ordinary skill in the art understands, this is not an essential option, because MGC 10 has disposed a plurality of IP communication interface boards, can between MGC 10 and MGW 20, set up many transmission links, so MGW 20 also can only dispose an IP communication interface board.
Based on better embodiment of the present invention, in the present invention's the 4th better embodiment, MGC 10 can distribute priority to transmission link, and preferentially uses the high available transmission link of priority; MGC 10 also can be according to the principle of load sharing, and the control protocol distribution of messages that difference is called out is to different transmission links.
The flow process that control protocol is carried between the MGC of better embodiment and MGW according to the present invention as shown in Figure 2.
At first enter step 210, be MGC at least two IP communication interface boards of configuration and corresponding IP address.Wherein, the corresponding a plurality of IP of a plurality of IP communication interface boards address can be used for setting up a plurality of transmission links.
Then enter step 220, dispose at least two IP addresses of this MGC for the MGW that belongs to this MGC.Need to prove, the present invention program belongs to a plurality of at least IP address that the MGW of this MGC disposes this MGC, many transmission links of a plurality of IP address correspondence all are connected to same ownership MGC, when the accidental interruption of a transmission link, can also use other transmission link to be connected with MGC 10, connection between MGW and the MGC is not interrupted, still can guarantee the reliable transmission of message, this and prior art scheme have essential distinction, in the prior art scheme, though H.248 agreement allows for the address that same MGW disposes a plurality of MGC, but this is used for many ownership functions, these addresses belong to different MGC, so that after the MGC collapse that MGW finds oneself to belong to, can initiate registration again to another standby MGC.MGW switches between a plurality of MGC and can cause professional interruption, and this is a kind of disaster recovery measure, and accidental sudden strain of a muscle that obviously is not suitable for the signaling bear net broken.
Then enter step 230, between MGC and MGW, set up at least two transmission links.Wherein, transmission link can use Transmission Control Protocol or udp protocol, and a transmission link has unique four-tuple, i.e. the IP address of the port numbers of the IP address of MGC, MG, MGW and the port numbers of MGW.Those of ordinary skill in the art understands, and uses at least two transmission links to be connected between MGC and MGW, has been equivalent to provide the mechanism of a redundancy backup, can avoid causing communication interruption owing to a transmission link fault.
Then enter step 240, MGC uses transmission link to send control protocol message to MGW.Wherein, MGC is used for sending the transmission link of control protocol message and can be selected according to the priority of transmission link by MGC, is perhaps selected according to the principle of load sharing by MGC.Load sharing has several different methods, when for example needing transmission control protocol message, selects one at random from current many available transmission links, and perhaps each transmission link sends or the like successively in turn according to numbering.Need to prove that for the succession that guarantees that the same call signaling transmits, the control protocol message of same call transmits, unless this transmission link fault on same transmission link.
Then enter step 250, judge whether the transmission link of current transmission control protocol message is unusual,, otherwise finish if then enter step 260.If in the time of presetting length, do not receive the response message of answer, can think that then the transmission link of current transmission control protocol message is unusual.
In step 260, MGC selects other transmission link to send control protocol message and rebuilds unusual transmission link.Wherein, the reconstruction of TCP transmission link is identical with prior art, and the reconstruction of UDP transmission link can be by the realization of regularly shaking hands.In the prior art, retransmitting all is to carry out on former transmission link, is to carry out on other transmission link and retransmit among the present invention.Because in a single day a transmission link has taken place once overtime, retransmit next time and overtime possibility takes place again, retransmit the real-time and the reliability that can improve transmission effectively on other normal transmission link so be chosen in much larger than other normal transmission link.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (11)
1. the bearing system of a MGCP, comprise Media Gateway Controller and at least one media gateway that belongs to this Media Gateway Controller, described Media Gateway Controller is connected by the IP protocol network with described media gateway, it is characterized in that, described Media Gateway Controller also comprises at least two communication interfaces with different IP protocol address, and utilizes these communication interfaces to set up at least two transmission links that are used to carry described control protocol with described media gateway respectively;
Described Media Gateway Controller also is used to monitor the state of each described transmission link, when finding the transmission link fault, attempt rebuilding this transmission link, and select the normal transmission link of other state, so that transfer medium gateway control protocol message is given described media gateway.
2. the bearing system of MGCP according to claim 1, it is characterized in that, described media gateway also is set at least two IP protocol address of described Media Gateway Controller configuration according to system, and set up at least two transmission links between described Media Gateway Controller, when receiving described MGCP message, reply response message.
3. the bearing system of MGCP according to claim 2 is characterized in that, described transmission link uses transmission control protocol or User Datagram Protoco (UDP).
4. the bearing system of MGCP according to claim 3, it is characterized in that, when described transmission link uses transmission control protocol, described Media Gateway Controller is monitored the state of described transmission link according to the described response message of described media gateway, if after sending described MGCP message on the transmission link, do not receive the response message of described media gateway at the appointed time, then judge this transmission link fault.
5. the bearing system of MGCP according to claim 3, it is characterized in that, described Media Gateway Controller according to the described response message of described media gateway and and described media gateway between the shake hands state of the described transmission link of monitoring of timing, if regularly shake hands failure or on same transmission link the described MGCP message of continuous retransmission surpass thresholding, then judge this transmission link fault.
6. according to the bearing system of each described MGCP in the claim 1 to 5, it is characterized in that described Media Gateway Controller also is that described transmission link distributes priority, and preferentially uses the high available transmission link of priority.
7. according to the bearing system of each described MGCP in the claim 1 to 5, it is characterized in that, described Media Gateway Controller is also according to the principle of load sharing, and the MGCP distribution of messages that difference is called out is to different transmission links.
8. according to the bearing system of each described MGCP in the claim 1 to 5, it is characterized in that, described media gateway also comprises at least two communication interfaces, and the communication interface of described Media Gateway Controller and described media gateway is set up described transmission link in twos.
9. according to the bearing system of each described MGCP in the claim 1 to 5, it is characterized in that described MGCP is H.248 agreement or MGCP agreement.
10. the bearing method of a MGCP is applied to the bearing system of the described MGCP of claim 1, it is characterized in that, comprises following steps:
Media Gateway Controller or media gateway are passed through a current normal transmission link after the opposite end sends MGCP message, if in the time of presetting length, do not receive the response message of answer, then in other normal transmission link, select one and send this MGCP message once more.
11. the bearing method of MGCP according to claim 10, it is characterized in that, when described Media Gateway Controller or media gateway need send MGCP message, from current normal each transmission link, select a transmission at random.
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| 下一代网络中媒体网关控制协议－MGCP/H.248/MEGACO的研究. 刘伟彦，张顺颐.电信科学，第4期. 2005 * |
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