CN1870700A - Method for access comprehensive service digital network service stage at next generation network - Google Patents
Method for access comprehensive service digital network service stage at next generation network Download PDFInfo
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- CN1870700A CN1870700A CN 200510034931 CN200510034931A CN1870700A CN 1870700 A CN1870700 A CN 1870700A CN 200510034931 CN200510034931 CN 200510034931 CN 200510034931 A CN200510034931 A CN 200510034931A CN 1870700 A CN1870700 A CN 1870700A
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Abstract
This invention provides a method for accessing an ISDN service stage into the next generation network including: when a party starts up calls among users of the ISDN service stage and the next generation network, a media gateway transmits the call control information between said ISDN service stage and a soft switch, which controls said media gateway to negotiate on the called media flow and sets up the media flow connection for the calls between said ISDN service stage and the other party of the session. According to this invention, when the network of the traditional circuit switched ISDN service stage is reformed to NGN, it can be still accessed into the soft switch to protect resources.
Description
Technical field
The present invention relates to the data communication service of next generation network (NGN).More particularly, relate to the method that in NGN, inserts the Integrated Service Digital Network console.
Background technology
In traditional public telephone switching network (PSTN), the circuit switching exchange of a lot of models can provide the ISDN call service station function.The ISDN console usually can be a computer that is inserted with the ISDN card, operation console process software on this computer.The ISDN card provides ISDN 2B+D interface, is connected to the switch of supporting ISDN 2B+D interface by subscribers feeder.The ISDN console is as the exchange of group users such as enterprise, for group user provides the telephone traffic transfer service, but and telephone subscriber's data such as exhalation authority in the managerial body, and receive the telephone subscriber breathes out in the group ticket and the telephone expenses of telephone subscriber in the group are settled accounts carrying out.This ISDN console is connected to switch by isdn circuit.
At present, traditional PSTN network is just gradually to the evolution of NGN network.Simultaneously, the group users such as enterprise in the NGN network still need the exchange function.And because the restriction of wiring in original building still needs the ISDN console that inserts by original subscribers feeder.Therefore, in the NGN network, still need to insert the ISDN console.
As everyone knows, traditional PSTN network is based on Circuit-switched, and the NGN network then is based on the network of packet switching.Therefore, need provide and to be linked into based on the implementation method in the NGN network of packet switching based on Circuit-switched ISDN console.
Summary of the invention
The objective of the invention is to provide a kind of method that can realize the ISDN information desk in the NGN network, the contradiction between the grouping access way that circuit access way by solving the ISDN console and NGN provide realizes the intercommunication between two kinds of access waies.
The method of ISDN console that realizes in next generation network according to the present invention comprises: 1) make a call between the conversation the opposing party in ISDN console and next generation network; 2) between described ISDN console and soft switch, transmit the control messages of described calling by media gateway; 3) described soft switch is controlled described media gateway the Media Stream of described calling is held consultation; And 4) based on described control messages with to the negotiation of described Media Stream, being described ISDN console by described media gateway is connected with described call setup Media Stream between described conversation the opposing party.
Preferred, Q.931 the control messages of described calling is carried in the message, and the transmission of described call control message comprises:
Set up the Q.921 link on the D channel between described ISDN console and the described media gateway;
Described media gateway is taken out the Q.921 described call control message of link bearer, behind the interface identifier that has added described ISDN console, it is carried to passes to described soft switch in the SCTP message; With
Described media gateway is from the described call control message from taking-up interface identifier and transparent transmission the SCTP message of described soft switch, interface identifier is mapped to described Q.921 link, by this Q.921 link be the described call control message of ISDN console carrying transparent transmission.
Preferred, the present invention also comprises the steps:
5) described media gateway will be converted to the RTP Media Stream from the circuit mode voice signal of described ISDN console and will be the voice signal of the circuit mode of described ISDN console from described conversation the opposing party's RTP media stream transition.
Preferred, described conversion comprises:
The code encoding/decoding mode that described media gateway uses Media Gateway Controller to select is encoded to the voice signal on the described ISDN B channel, and the voice signal after will encoding by RTP is sent to described conversation the opposing party; With
Media Stream voice packet the RTP bag that described media gateway is received other users on IP network is decoded, and uses described ISDN B channel to send to described ISDN console.
Preferred, described Media Gateway Controller selects the step of code encoding/decoding mode to comprise:
Described Media Gateway Controller obtains the code encoding/decoding mode tabulation that the local terminal media gateway can be supported by the Media Stream control protocol, obtains the code encoding/decoding mode tabulation that the opposite end media gateway can be supported by the agreement between the Media Gateway Controller; With
Described Media Gateway Controller is chosen in a kind of code encoding/decoding mode of all existing in two tabulations code encoding/decoding mode as this, and indicating media gateway is set up Media Stream.
Because media gateway can be finished the bi-directional conversion that the real-time transport protocol (rtp) medium flow to ISDN B path voice signal; so after having used the present invention; the ISDN console of traditional circuit exchange mode still can insert soft switch when the network rebuilding is NGN, thereby protects existing investment.In addition, newly-built NGN network, when user facility inside does not possess IP network, but when general twisted-pair power cable is arranged, ISDN console that still can the place in circuit mode is for the user provides service.
Description of drawings
Fig. 1 is the networking diagram that is used to realize the access of ISDN console according to of the present invention in NGN;
Fig. 2 is the correspondence figure according to NGN of the present invention and ISDN console;
Fig. 3 has shown that the ISDN console carries out the call flow that caller is breathed out.
Embodiment
The objective of the invention is to provide a kind of method that can in the NGN network, realize the ISDN information desk.For this purpose, the contradiction between the grouping access way that circuit access way that needs solution ISDN console provides and NGN network provide realizes the conversion between two kinds of communication modes.This conversion need rely on media gateway and realize.Below in conjunction with Fig. 1 and Fig. 2 embodiments of the present invention are described.
ISDN console 1 illustrated in figures 1 and 2 can be a computer, is inserted with the ISDN communication card on this computer, and operation has conventional operating system software and console terminal software.ISDN console 1 is by the ISDN 2B+D interface access media gateway 2 of ISDN communication card, and media gateway 2 is connected to soft switch 3 by packet network (for example IP network).Its implementation all is existing technology, and this specification repeats no more.Media gateway 2 is responsible for the conversion of isdn circuit exchanged form and IP block exchange mode.To describe in detail hereinafter.
ISDN console 1 comprises two kinds of message with extraneous communicating by letter.A kind of be and soft switch 3 between the signaling message of calling control, be called signaling flow.Signaling flow is used to finish CCF and other console service management function, is carried on the ISDN D channel.Another kind of communication information be and the opposing party 4 of conversation between Media Stream message, be called Media Stream, the voice signal of ISDN console 1 and extraneous conversation just.Media stream bearing is on ISDN B channel.
In addition, because ISDN console 1 need be by IP network and extraneous conversation, Media Stream need enter IP network by media gateway 2.Media stream bearing between ISDN console 1 and the media gateway 2 converts the Media Stream that is carried on the IP network to by media gateway on ISDN B channel.Therefore, the realization of ISDN console 1 also needs the Media Stream control messages between calling the opposing party in media gateway 2 and the NGN network.Because media gateway is not directly controlled the mutual of signaling with the IP network outside, therefore, conversation the opposing party is mutual with transmitting by Media Gateway Controller (being soft switch in this example) in media gateway for this Media Stream control messages.
Above-mentioned several message are further described respectively below.As mentioned above, call control message (that is, signaling flow) is the message of handling between ISDN console 1 and the soft switch 3, and this call control message can be a message Q.931, or for strengthening call service station function to the Q.931 expansion of message.For example, for the call function that strengthens console or increase management function, increase a kind of call property, at this moment need message is Q.931 expanded, increase the message elements of new type or increase new type of message.Between ISDN console 1 and media gateway 2, call control message is carried on the ISDN D channel.Between media gateway 2 and soft switch 3, call control message utilizes the stream control transmission protocol (sctp) bag to be carried on the IP network.
As mentioned above, media gateway 2 is responsible for the conversion of isdn circuit exchanged form and IP block exchange mode, comprises the conversion between ISDN D channel massage and the SCTP message.Specifically, set up the Q.921 link on the D channel between ISDN console 1 and the media gateway 2, the Q.931 message that is used to call out control is carried on this Q.921 link.Between media gateway 2 and soft switch 3, discern ISDN console 1 by interface identifier, finish the Q.921 mapping between the link and interface identifier by media gateway 2.
The forwards of 2 pairs of ISDN consoles 1 of media gateway comprises two parts: a part is the Q.931 message that Q.921 transparent transmission carries in the message, and another part is to finish the Q.921 mapping between the link and interface identifier.That is, for the message of the ISDN console of receiving, media gateway 2 is responsible for taking out the Q.921 Q.931 message of link bearer, and behind the interface identifier that has added the ISDN console it is carried to and passes to soft switch 3 in the SCTP message.On the other hand, for the SCTP message that receives from soft switch 3, media gateway 2 is taken out the Q.931 message of interface identifier and transparent transmission from message body, interface identifier is mapped to Q.921 link, by this Q.921 link be the Q.931 message of ISDN console carrying transparent transmission.Like this, media gateway 2 further is carried to the link layer message of the ISDN D channel bearing received in the SCTP bag, and be transmitted to soft switch 3, in ISDN D channel, send ISDN console 1 with the message bearing the IP bag that will receive from soft switch 3 to, thereby realize communicating by letter of call control message between ISDN console 1 and the soft switch 3.Media gateway 2 itself just realizes two-way forwards by above-mentioned conversion, call control message is not handled.That is, media gateway 2 does not need call identifying control messages content, only it need be carried out transparent mode as payload and transmit.
Except the forwarding of finishing ISDN console 1 call control message, media gateway 2 also need to handle and soft switch 3 between the Media Stream control messages.Because ISDN console 1 belongs to media gateway 2 subordinaties' a circuit user, when ISDN console 1 is conversed with the external world, Media Stream is divided into relatively independent two sections, one section is the circuit between ISDN console 1 and the media gateway 2, be ISDN B path, another section is the IP path between media gateway 2 and the outside media gateway.And Media Stream will carry on IP network, need carry out the negotiation of Media Stream, with functions such as the foundation of finishing Media Stream, dismounting, modifications, and consults to use identical media stream code/decode algorithm to carry out the communication of Media Stream.Media gateway need be under the control of Media Gateway Controller, finishes functions such as the foundation of Media Stream and dismounting.Use the Media Stream control protocol to finish this function between media gateway and the Media Gateway Controller.
On the NGN network, soft switch is exactly the Media Stream controller of media gateway, and foundation, the dismounting of Media Stream are finished in the instruction of media gateway receiving media gateway controller.In ISDN scheme of the present invention, media gateway 2 need be finished negotiation of media streams by the Media Stream control messages under the control of soft switch 3, to set up the Media Stream on the IP network.The Media Stream control messages adopts the Media Stream control protocol be carried on the User Data Protocol (UDP), can be the Media Stream control protocol of standard, for example MGCP agreement, agreement etc. H.248.
Set up after the Media Stream, media gateway 2 also is responsible for finishing the conversion of the B channel voice signal and the IP mode Media Stream of ISDN console 1.Specifically, will be converted to real-time transport protocol (rtp) Media Stream and will be the voice signal of ISDN console 1 circuit mode from the RTP media stream transition of other users on the IP network exactly from the circuit mode voice signal of ISDN console 1.
In concrete transfer process, the code encoding/decoding mode that media gateway 2 uses Media Gateway Controllers to select is encoded to the voice signal on the ISDN B channel, and the voice signal after will encoding by Real-time Transport Protocol is sent to the opposite end.On the other hand, the Media Stream voice packet in the RTP bag of receiving is decoded, and use the B channel to send to ISDN console one end.The code encoding/decoding mode that Media Gateway Controller is selected is the code encoding/decoding mode that the both call sides media gateway is all supported.Promptly, Media Gateway Controller obtains the code encoding/decoding mode tabulation that the local terminal media gateway can be supported by the Media Stream control protocol, obtain the code encoding/decoding mode tabulation that the opposite end media gateway can be supported by the agreement between the Media Gateway Controller, and being chosen in a kind of code encoding/decoding mode of all existing in two tabulations code encoding/decoding mode as this, indicating media gateway is set up Media Stream.If do not have common code encoding/decoding mode in two tabulations, then can not set up Media Stream.Code encoding/decoding mode can adopt the algorithm of standard, for example G.711, and G.723, G.729 etc.
As mentioned above, in embodiments of the invention, the negotiation of media streams on the signaling channel of ISDN console, Media Stream path and the IP network is to finish under the cooperation of media gateway, and calls out control and separate with Media Stream control.Calling out control is to handle by the Q.931 message between ISDN console 1 and soft switch 3, comprise calling initiation, reply etc.Media Stream control uses Media Stream control protocol (for example MGCP agreement) to handle between media gateway 2 and soft switch 3.The Media Stream of handling is controlled negotiation, foundation and the dismounting of Media Stream between the opposing party 4 who finishes and converse.But in calling procedure, calling control cooperates with Media Stream control to be carried out.That is, carry out carrying out in the process appropriate Media Stream in calling and handle, can setting up Media Stream in the time that enters conversation in calling, and when end of calling, can remove Media Stream and connect.Its process will be described hereinafter.
Specify a kind of embodiment that in NGN, realizes the ISDN console of the present invention below with reference to signal flow graph shown in Figure 3.
Setting up conversation with the opposing party 4 (referring to shown in Figure 1) that ISDN console 1 is initiatively breathed out and the called party promptly converses is example.At first, ISDN console 1 sends SETUP message (step s001) via media gateway 2 to soft switch 3 by ISDN 2B+D interface channel.Then, media gateway 2 is carried out communication via IP network and soft switch 3.Soft switch 3 sends the CRCX message of creating connection to media gateway 2 after receiving the SETUP message of ISDN console 1, create RTP ports (step s002) with indicating media gateway 2.
Then, media gateway 2 is that this ISDN console 1 is prepared RTP resource, by CRCX ACK message the RTP medium stream information of local terminal is returned to soft switch 3 (step s003).After the CRCX ACK message of media gateway 2 is received in soft switch 3, determine that media gateway 2 has been ready to the RTP resource for ISDN console 1.So soft switch 3 sends SETUP ACK message to ISDN console 1 (step s004).Soft switch 3 will make a call to the called subscriber, SDP (Session Description Protocol) message of this ISDN console 1 can be sent to called party 4 in the exhalation process.
After called party 4 received this SDP message, the media capability that will select both sides all to possess, and the RTP resource of application oneself returned to soft switch 3 with this SDP message.Like this, the media stream code/decode algorithm that the both sides that need conversation support has just been obtained in soft switch 3.
After callee's ring, return bell signal to soft switch, soft switch 3 will be sent ALERTING message to ISDN console 1, indication playing RBT (step s005).
After called party 4 replys, soft switch 3 will send MDCX message to media gateway 2.To take back called party 4 SDP message in this MDCX message, indicating media gateway 2 is set up the RTP Media Stream for ISDN console 1 and is connected, and promptly media gateway 2 is by RTP port transmitting-receiving Media Stream (step s006, step s007).Media gateway 2 is connected (promptly with called party 4 RTP Media Stream except setting up, between media gateway 2 and called party 4, pass through the voice signal of RTP message bearing) outside, also the mode of describing according to preamble starts the bi-directional conversion that the RTP medium flow to ISDN B path voice signal.
After above-mentioned Media Stream connected foundation, soft switch 3 sent CONNECT message to ISDN console 1, and indication ISDN console 1 has entered talking state.At this moment, the RTP port that ISDN console 1 can be created by its ISDN B channel that has and media gateway 2 is with the opposing party 4 of conversation begin to have conversed (step s008).
Behind ISDN console 1 end of conversation, carry out the on-hook operation, will send DISCONNECT message then to soft switch 3 (step s009).After this DISCONNECT message is received in soft switch 3, will send DLCX message to media gateway 2, the RTP that indicating media gateway 2 is removed this ISDN console connects, and discharges resource (step s010-step s013).
Because media gateway 2 can finish the bi-directional conversion that the RTP medium flow to ISDN B path voice signal, therefore, ISDN console 1 is during as the callee, and it is with identical with above-mentioned situation from the communication between other user of IP network.
Though above explanation to invention is carried out with reference to its specific embodiment; but those of ordinary skill in the art is to be appreciated that; in scope and spirit of the present invention; can carry out various improvement, interpolation and replacement, so these improve, add and replace all in the protection range that claim of the present invention limited.
Claims (9)
1. method that inserts the ISDN console in next generation network comprises:
1) makes a call between the conversation the opposing party in ISDN console and next generation network;
2) between described ISDN console and soft switch, transmit the control messages of described calling by media gateway;
3) described soft switch is controlled described media gateway the Media Stream of described calling is held consultation; And
4) based on described control messages with to the negotiation of described Media Stream, being described ISDN console by described media gateway is connected with described call setup Media Stream between described conversation the opposing party.
2. the method for claim 1 is characterized in that, Q.931 the control messages of described calling is carried in the message, and the transmission of described call control message comprises:
Set up the Q.921 link on the D channel between described ISDN console and the described media gateway;
Described media gateway is taken out the Q.921 described call control message of link bearer, behind the interface identifier that has added described ISDN console, it is carried to passes to described soft switch in the SCTP message; With
Described media gateway is from the described call control message from taking-up interface identifier and transparent transmission the SCTP message of described soft switch, interface identifier is mapped to described Q.921 link, by this Q.921 link be the described call control message of ISDN console carrying transparent transmission.
3. the method for claim 1 is characterized in that, to foundation, dismounting, the modification of holding consultation and comprising Media Stream of the Media Stream of described calling, and determines employed media stream code/decode algorithm.
4. the method for claim 1 is characterized in that, it also comprises the steps:
5) described media gateway will be converted to the RTP Media Stream from the circuit mode voice signal of described ISDN console and will be the voice signal of the circuit mode of described ISDN console from described conversation the opposing party's RTP media stream transition.
5. method as claimed in claim 4 is characterized in that, described conversion comprises:
The code encoding/decoding mode that described media gateway uses Media Gateway Controller to select is encoded to the voice signal on the described ISDN B channel, and the voice signal after will encoding by RTP is sent to described conversation the opposing party; With
Media Stream voice packet the RTP bag that described media gateway is received other users on IP network is decoded, and uses described ISDN B channel to send to described ISDN console.
6. method as claimed in claim 5 is characterized in that, described Media Gateway Controller selects the step of code encoding/decoding mode to comprise:
Described Media Gateway Controller obtains the code encoding/decoding mode tabulation that the local terminal media gateway can be supported by the Media Stream control protocol, obtains the code encoding/decoding mode tabulation that the opposite end media gateway can be supported by the agreement between the Media Gateway Controller; With
Described Media Gateway Controller is chosen in a kind of code encoding/decoding mode of all existing in two tabulations code encoding/decoding mode as this, and indicating media gateway is set up Media Stream.
7. method as claimed in claim 5 is characterized in that, described Media Gateway Controller is described soft switch.
8. method as claimed in claim 6 is characterized in that, described Media Gateway Controller is described soft switch.
9. as each described method of claim 1-8, it is characterized in that, in described step 2) in comprise that further described media gateway is according to the control of described soft switch, create live transmission protocol port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100349314A CN100571307C (en) | 2005-05-27 | 2005-05-27 | In next generation network, insert the method for integrated services digital network console |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100349314A CN100571307C (en) | 2005-05-27 | 2005-05-27 | In next generation network, insert the method for integrated services digital network console |
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| CN1870700A true CN1870700A (en) | 2006-11-29 |
| CN100571307C CN100571307C (en) | 2009-12-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227361B (en) * | 2008-01-29 | 2010-12-29 | 中兴通讯股份有限公司 | System and method for accessing client end to next network |
| CN102333166A (en) * | 2011-09-07 | 2012-01-25 | 河北远东哈里斯通信有限公司 | Soft switch call processing method for passing through proprietary service information |
| CN101217599B (en) * | 2008-01-14 | 2012-02-29 | 中兴通讯股份有限公司 | A logging on method from attendant console user end to server |
| CN102511160A (en) * | 2011-12-22 | 2012-06-20 | 华为技术有限公司 | Fax instruction method and conversion equipment |
-
2005
- 2005-05-27 CN CNB2005100349314A patent/CN100571307C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101217599B (en) * | 2008-01-14 | 2012-02-29 | 中兴通讯股份有限公司 | A logging on method from attendant console user end to server |
| CN101227361B (en) * | 2008-01-29 | 2010-12-29 | 中兴通讯股份有限公司 | System and method for accessing client end to next network |
| CN102333166A (en) * | 2011-09-07 | 2012-01-25 | 河北远东哈里斯通信有限公司 | Soft switch call processing method for passing through proprietary service information |
| CN102511160A (en) * | 2011-12-22 | 2012-06-20 | 华为技术有限公司 | Fax instruction method and conversion equipment |
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| CN100571307C (en) | 2009-12-16 |
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