CN101060504A - A method for negotiating the next generation of network media gateway fax switching mode - Google Patents
A method for negotiating the next generation of network media gateway fax switching mode Download PDFInfo
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- CN101060504A CN101060504A CN 200710098217 CN200710098217A CN101060504A CN 101060504 A CN101060504 A CN 101060504A CN 200710098217 CN200710098217 CN 200710098217 CN 200710098217 A CN200710098217 A CN 200710098217A CN 101060504 A CN101060504 A CN 101060504A
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Abstract
The provided negotiation method for next-generation media gateway fax switch way comprises: a. the initial media gateway sends fax configuration parameter; b. the receiving gateway receives the parameter, negotiates the switch way and codec parameter, and obtains the result; and c. it sends the result to the sender. This invention ensures same switch way on both sides.
Description
Technical field
The present invention relates to a kind of machinery of consultation that is applicable to the fax of the media gateway in the next generation network (NGN) switching mode.
Background technology
Along with the development of NGN, the fusion paces of IP technology and conventional telecommunications technology are further accelerated, and make IP-based facsimile service also grow up gradually.Fax over IP utilizes existing IP infrastructure, the online fax that transmits of original call is incorporated on the IP network transmits, and can provide a cover comprehensive enhancement mode fax services to the user, both can realize traditional facsimile function, is convenient to develop new function again.The Fax over IP biggest advantage is that transmission cost is cheap, and in particular for telecommunication (International or National long distance communication), its price is significantly less than common telephone network; And the existing number of users of facsimile machine is huge, and therefore, the Fax over IP business is a business with suitable market competitiveness, will more and more be subject to people's attention.
Carry out normal Fax over IP business, the media channel of receiving-transmitting sides media gateway must switch to identical media state simultaneously in official hour, adopts identical code encoding/decoding mode to communicate.And to guarantee in official hour, to switch to simultaneously identical media state, must there be changing method to guarantee.Changing method commonly used has following three kinds:
1 is controlled by Media Gateway Controller (MGC) mode
Under this mode, media gateway detects the facsimile signal (generally be V.21 targeting signal) of facsimile machine in communication process, this signal is reported MGC by outside signaling as signaling H.248 in the mode of incident, MGC carries out media negotiation according to the configuration and the opposite end gateway of this gateway, consult the fax mode that both sides support (T.38 or VBD), notification gateway switches to corresponding fax mode then, and the codec parameters of configuration facsimile medium, thereby guarantee that the receiving-transmitting sides gateway switches to identical state in official hour.This mode compatibility is good, is convenient to centralized control.But need Media Gateway Controller and media gateway to support simultaneously.
2 media gateway auto-negotiation modes
Adopt this mode, the negotiation of facsimile medium encoding and decoding is only carried out between the transmitting-receiving gateway, does not pass through Media Gateway Controller.Media gateway detects after the facsimile signal, by RTCP APP or RFC2833 event mode, the fax encoding and decoding that local terminal is adopted are transferred to the opposite end, the opposite end receives after the fax handoff request, analyzes and take corresponding change action according to the fax ability of local terminal, if support the code encoding/decoding mode of request, understand back ACK, and carry out the medium switching, if do not support, the request fax is initiated gateway and is selected other code encoding/decoding mode for use.Thereby guarantee that the receiving-transmitting sides gateway switches to identical state in official hour.This mode compatibility is poor, but only needs the media gateway support to get final product.
3 voice packet transparent transmission modes
Adopt this mode, after media gateway detected fax, channel status was not made any change, and with the employed code encoding/decoding mode of current speech passage, the packing interval is to the facsimile image data coding transmission.This method is only just available for G.711A/U the time at the code encoding/decoding mode of voice call.This mode does not need media gateway and Media Gateway Controller that fax is done special processing, adopts this mode during the devices from different manufacturers intercommunication.
According to the difference of the code encoding/decoding mode that adopts in the facsimile posting, the fax mode in the next generation network has following two kinds:
1 based on agreement T.38.T.38 agreement is the Real-Time IP fax standard that ITU proposes.This agreement has been stipulated the communication process between the Fax over IP gateway.According to agreement T.38, the transmit leg media gateway carry out from the signal of facsimile machine demodulation, handshake exchange information that all are relevant be encapsulated among TCP or the UDP, by IP network send to the receiving method, medium gateway, the receiving method, medium gateway is modulated analog line again according to the information that is loaded with in TCP or the UDP bag, issues facsimile machine then.This implementation is owing to carry out demodulation, encapsulation, modulate and take the Discarded Packets compensation measure to facsimile signal, and therefore, the quality of fax is higher, intercommunication success rate height.But compatible relatively poor to facsimile machine.
The 2VBD mode.VBD (voice Band Data) mode, i.e. data transfer mode in the voice band.Adopt G.711 encoding and decoding that facsimile signal is packed, transmit by the RTP packet form.This mode is adjusted configuration parameter, and carried out Discarded Packets compensation according to network condition according to the characteristics of fax, and is better to the compatibility of facsimile machine.If but network condition is poor, this mode effect of collecting seed is also bad.
Owing to have different fax switching mode and decoding method.If different media gateway adopts different switching modes and decoding method, will cause fax failure.Following several situation is arranged:
1) the A gateway adopts the MGC mode that is controlled by, and the B gateway adopts media gateway auto-negotiation mode or transparent transmission mode.As A, when the B gateway carries out facsimile, the A gateway detects facsimile signal, and the reporting events of will faxing is given MGC, the request facsimile service.At this moment, MGC can initiate the fax request to the B gateway, because the B gateway is not to adopt controlled MGC mode, then can not discern this request, and the transmitting-receiving gateway does not switch to identical state simultaneously in official hour, cause fax failure.
2) the A gateway adopts media gateway auto-negotiation mode, and the B gateway adopts the transparent transmission mode or is controlled by the MGC mode.As A, when the B gateway carries out facsimile, the A gateway detects facsimile signal, and the incident of will faxing is given the B gateway with RTCP APP or RFC2833 event transmission, the request facsimile service.Because the B gateway is not to adopt media gateway auto-negotiation mode, then can not discern this request, the transmitting-receiving gateway does not switch to identical state simultaneously in official hour, cause fax failure.
At present, the patent No. 10120016 discloses the implementation method of faxing in a kind of next generation network, and this method has only considered that the receiving-transmitting sides gateway all adopts the situation of controlled MGC, if receiving-transmitting sides has only a side to adopt controlled MGC mode, fax still can be failed.The patent No. 10059172 discloses a kind of fax of IP based network and has realized synchronous switching method, this method has only considered that the receiving-transmitting sides gateway all adopts the situation of media gateway auto-negotiation mode, if receiving-transmitting sides has only a side to adopt media gateway auto-negotiation mode, fax still can be failed.
Summary of the invention
Technical problem to be solved by this invention provides a kind of machinery of consultation of next generation of network media gateway fax switching mode, guarantees that both sides' gateway adopts identical fax switching mode, carries out facsimile service smoothly.
In order to solve the problems of the technologies described above, the invention provides a kind of machinery of consultation of next generation of network media gateway fax switching mode, may further comprise the steps:
(a) the transmit leg media gateway sends the fax configuration parameter to the receiving method, medium gateway;
(b) after the receiving method, medium gateway receives described fax configuration parameter,, consult fax switching mode and codec parameters, and obtain negotiation result according to the fax configuration parameter of both sides' gateway;
(c) the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result.
Further, said method also can have following characteristics: in the step (a), the transmit leg media gateway sends fax configuration parameter query messages to the receiving method, medium gateway, and the configuration parameter of local terminal; In the step (b), the receiving method, medium gateway receives after the query messages of transmit leg media gateway, according to the fax configuration parameter of both sides' gateway, consults fax switching mode and codec parameters, and obtains negotiation result; In the step (c), the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result in the mode of fax configuration parameter response message.
Further, said method also can have following characteristics: in the step (b), the receiving method, medium gateway is consulted fax switching mode and codec parameters, obtains negotiation result, and preserves this negotiation result; In the step (c), the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result, and the transmit leg media gateway is preserved described negotiation result.
Further, said method also can have following characteristics: in the step (a), the transmit leg media gateway sends fax configuration parameter query messages to the receiving method, medium gateway, and carries the configuration parameter of local terminal in this message.
Further, said method also can have following characteristics: in the step (b), the fax configuration parameter comprises fax switching mode, codec parameters; Hold consultation according to switching mode and codec parameters that both sides' gateway disposes at present, ask the common factor part of its capability set.
Further, said method also can have following characteristics: step (a) and (c) in, described fax configuration parameter query/response message adopts RTCP Real-time Transport Control Protocol.
A kind of facsimile method of next generation network may further comprise the steps:
(1) transmit leg media gateway and receiving method, medium gateway are set up call conversation under the control of Media Gateway Controller;
(2) transmit leg media gateway and receiving method, medium gateway are consulted the fax switching mode, produce negotiation result;
(3) transmit leg media gateway or receiving method, medium gateway detect after the fax incident, initiate the fax request according to negotiation result, and the operation of faxing.
Further, said method also can have following characteristics: in the step (2), transmit leg media gateway and receiving method, medium gateway are preserved the negotiation result that is produced.
Further, said method also can have following characteristics: step (2) further may further comprise the steps: (21) transmit leg media gateway sends fax configuration parameter query messages to the receiving method, medium gateway, and the configuration parameter of local terminal; (22) the receiving method, medium gateway receives after the query messages of transmit leg media gateway, according to the fax configuration parameter of both sides' gateway, consults fax switching mode and codec parameters, obtains negotiation result, and preserves this negotiation result; (23) the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result in the mode of fax configuration parameter response message, and the transmit leg media gateway is preserved described negotiation result.
Further, said method also can have following characteristics: in the step (22), the fax configuration parameter comprises fax switching mode, codec parameters; Hold consultation according to switching mode and codec parameters that both sides' gateway disposes at present, ask the common factor part of its capability set.
Compared with prior art, the inventive method is owing to just consulted the configuration parameter of fax receiving-transmitting sides gateway before the fax beginning, guaranteed that both sides' gateway adopts identical fax switching mode and identical encoding and decoding configuration, thereby improved the success rate of fax.This method goes for the fasystem of all next generation networks.
Description of drawings
Fig. 1 is the method flow diagram among the embodiment.
Embodiment
Below in conjunction with drawings and Examples realization flow of the present invention is elaborated.
A kind of facsimile method of next generation network may further comprise the steps:
Step 110, transmit leg media gateway (caller) and receiving method, medium gateway (called) are set up call conversation under the control of media gateway controller MGC;
Carry out off-hook, dialing to sending facsimile machine (caller), after the transmit leg media gateway receives number, send it to Media Gateway Controller, Media Gateway Controller finds the concurrent order of delivering letters of called gateway makes the machine of receiving faxes (called) produce ring, the machine off-hook of receiving faxes, thus the call conversation of transmit leg media gateway and receiving method, medium gateway set up.
Wherein, but intercommunication RTP/RTCP bag between transmit leg media gateway and the receiving method, medium gateway.
Step 120, transmit leg media gateway and receiving method, medium gateway are consulted the fax switching mode, and preserve the negotiation result that is produced;
Consult the fax switching mode and occur in after the call setup in that a period of time before the fax beginning, transmit leg media gateway and receiving method, medium gateway are consulted also not begin to send fax in the process of fax switching mode.
Step 130, transmit leg media gateway or receiving method, medium gateway detect after the fax incident, initiate the fax request according to negotiation result, and the operation of faxing.
The fax incident is that to be used for difference be facsimile machine or plain old telephone, generally adopts V.21 targeting signal as the fax incident.
The fax request generally is that the recipient initiates earlier, because the recipient detects V.21 targeting signal earlier.When the machine of receiving faxes was in the automated facsimile pattern, facsimile machine can enter FAX mode by automatic off-hook after ring several times, and this moment, the receiving method, medium gateway can detect the V.21 targeting signal that facsimile machine sends, and reported MGC initiation fax by signaling.If the machine of receiving faxes is in manual mode, after the power ringing of then receiving faxes, user's off-hook is pressed " beginning " or " startup ", and the machine of receiving faxes enters FAX mode.
With reference to the accompanying drawings 1, the machinery of consultation in the fax of the media gateway described in the step 120 switching mode may further comprise the steps:
Step 210, the transmit leg media gateway sends fax configuration parameter query messages to the receiving method, medium gateway, and carries the configuration parameter of local terminal in this query messages;
The transmit leg media gateway also can be carried the configuration parameter of local terminal in other message.
Step 220, receiving method, medium gateway receive after the query messages of transmit leg media gateway, according to the fax configuration parameter of both sides' gateway, consult fax switching mode and codec parameters, and preserve this negotiation result;
The fax configuration parameter comprises fax switching mode, codec parameters.Hold consultation according to switching mode and codec parameters that both sides' gateway disposes at present, ask the common factor part of its capability set.Stipulate a priority earlier: controlled MGC switching mode priority is higher than media gateway auto-negotiation mode; T.38 code encoding/decoding mode priority is lower than the VBD mode.For example, the transmit leg gateway be configured to the auto-negotiation switching mode, encoding and decoding are for T.38; Recipient's gateway be configured to be controlled by the MGC switching mode, encoding and decoding are VBD; The negotiation result of recipient's gateway is: switching mode is for being controlled by the MGC switching mode, and encoding and decoding are VBD.
Step 230, the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result in the mode of fax configuration parameter response message, and the transmit leg media gateway is preserved described negotiation result.
The form of fax configuration parameter query/response message can adopt RTP (RTP), RTCP (RTCP Real-time Transport Control Protocol), UDPTL (user datagram transport layer protocol), but because RTP, UDPTL are the carriers that is used to constitute Media Stream, be not suitable as the control purposes, therefore, fax configuration parameter query/response message adopts APP (the using self-defining RTCP bag) message among the RTCP.The advantage of using RTCP is that the structure of APP message can be self-defined, can satisfy the realization requirement of this function, adopts APP message can not influence not support the use of the media gateway that APP sends simultaneously, drops to the risk of fax failure minimum.
When the transmitting-receiving gateway configuration the fax switching mode not simultaneously, can cause fax failure.The present invention proposes the machinery of consultation of a kind of media gateway fax switching mode, consult, select with a kind of switching mode when guaranteeing to receive and dispatch gateway fax by sending the message switching mode of faxing.
A large amount of experiment statisticses show, adopt fax switching mode of the present invention machinery of consultation, can guarantee that fax still can be successful under the inconsistent situation of fax configuration parameter, have improved the success rate of fax.More than describe the principle and the realization of fax handover mechanism of the present invention machinery of consultation in detail, but should not be considered to be limitation of the scope of the invention.
Claims (10)
1, a kind of machinery of consultation of media gateway fax switching mode of future generation may further comprise the steps:
(a) the transmit leg media gateway sends the fax configuration parameter to the receiving method, medium gateway;
(b) after the receiving method, medium gateway receives described fax configuration parameter,, consult fax switching mode and codec parameters, and obtain negotiation result according to the fax configuration parameter of both sides' gateway;
(c) the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result.
2, method according to claim 1 is characterized in that:
In the step (a), the transmit leg media gateway sends fax configuration parameter query messages to the receiving method, medium gateway, and the configuration parameter of local terminal;
In the step (b), the receiving method, medium gateway receives after the query messages of transmit leg media gateway, according to the fax configuration parameter of both sides' gateway, consults fax switching mode and codec parameters, and obtains negotiation result;
In the step (c), the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result in the mode of fax configuration parameter response message.
3, as method as described in the claim 2, it is characterized in that:
In the step (b), the receiving method, medium gateway is consulted fax switching mode and codec parameters, obtains negotiation result, and preserves this negotiation result;
In the step (c), the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result, and the transmit leg media gateway is preserved described negotiation result.
4, as method as described in the claim 2, it is characterized in that:
In the step (a), the transmit leg media gateway sends fax configuration parameter query messages to the receiving method, medium gateway, and carries the configuration parameter of local terminal in this message.
5, method according to claim 1 is characterized in that:
In the step (b), the fax configuration parameter comprises fax switching mode, codec parameters; Hold consultation according to switching mode and codec parameters that both sides' gateway disposes at present, ask the common factor part of its capability set.
6, as method as described in the claim 2, it is characterized in that:
Step (a) and (c) in, described fax configuration parameter query/response message adopts RTCP Real-time Transport Control Protocol.
7, a kind of facsimile method of next generation network may further comprise the steps:
(1) transmit leg media gateway and receiving method, medium gateway are set up call conversation under the control of Media Gateway Controller;
(2) transmit leg media gateway and receiving method, medium gateway are consulted the fax switching mode, produce negotiation result;
(3) transmit leg media gateway or receiving method, medium gateway detect after the fax incident, initiate the fax request according to negotiation result, and the operation of faxing.
8, as method as described in the claim 7, it is characterized in that:
In the step (2), transmit leg media gateway and receiving method, medium gateway are preserved the negotiation result that is produced.
9, as method as described in the claim 8, it is characterized in that:
Step (2) further may further comprise the steps:
(21) the transmit leg media gateway sends fax configuration parameter query messages to the receiving method, medium gateway, and the configuration parameter of local terminal;
(22) the receiving method, medium gateway receives after the query messages of transmit leg media gateway, according to the fax configuration parameter of both sides' gateway, consults fax switching mode and codec parameters, obtains negotiation result, and preserves this negotiation result;
(23) the receiving method, medium gateway sends to the transmit leg media gateway with negotiation result in the mode of fax configuration parameter response message, and the transmit leg media gateway is preserved described negotiation result.
10, as method as described in the claim 8, it is characterized in that:
In the step (22), the fax configuration parameter comprises fax switching mode, codec parameters; Hold consultation according to switching mode and codec parameters that both sides' gateway disposes at present, ask the common factor part of its capability set.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100982170A CN101060504B (en) | 2007-04-13 | 2007-04-13 | A method for negotiating the next generation of network media gateway fax switching mode |
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| CN2007100982170A CN101060504B (en) | 2007-04-13 | 2007-04-13 | A method for negotiating the next generation of network media gateway fax switching mode |
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| CN101060504B CN101060504B (en) | 2010-12-08 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009152753A1 (en) * | 2008-06-20 | 2009-12-23 | 华为技术有限公司 | Method, network node and network system for negotiating the port attribute parameters |
| WO2010012141A1 (en) * | 2008-07-29 | 2010-02-04 | 中兴通讯股份有限公司 | A method and a system for negotiating parameter of a dual tone multi-frequency signal between media gateways |
| CN101662552B (en) * | 2008-08-26 | 2011-05-25 | 中兴通讯股份有限公司 | Method, system and media gateways for realizing encrypted fax |
| CN101330507B (en) * | 2007-11-15 | 2011-11-30 | 中兴通讯股份有限公司 | Method for implementing narrowband self-adaption multi-speed encoding/decoding negotiation |
| WO2016202053A1 (en) * | 2015-06-17 | 2016-12-22 | 中兴通讯股份有限公司 | Fax control method and gateway device |
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| CN1324869C (en) * | 2003-11-28 | 2007-07-04 | 华为技术有限公司 | Method for implementing facsimile in next generation network |
| CN100571146C (en) * | 2004-04-20 | 2009-12-16 | 微软公司 | Can carry out the nearly mthods, systems and devices of cooperation in real time by a plurality of computer systems for electronic document |
| CN1921478B (en) * | 2005-08-26 | 2011-09-14 | 华为技术有限公司 | Business signal transmitting method based on network agreement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101330507B (en) * | 2007-11-15 | 2011-11-30 | 中兴通讯股份有限公司 | Method for implementing narrowband self-adaption multi-speed encoding/decoding negotiation |
| WO2009152753A1 (en) * | 2008-06-20 | 2009-12-23 | 华为技术有限公司 | Method, network node and network system for negotiating the port attribute parameters |
| CN101610126B (en) * | 2008-06-20 | 2013-08-14 | 华为技术有限公司 | Method for consulting port attribute parameters, network node and network system |
| WO2010012141A1 (en) * | 2008-07-29 | 2010-02-04 | 中兴通讯股份有限公司 | A method and a system for negotiating parameter of a dual tone multi-frequency signal between media gateways |
| CN101662552B (en) * | 2008-08-26 | 2011-05-25 | 中兴通讯股份有限公司 | Method, system and media gateways for realizing encrypted fax |
| WO2016202053A1 (en) * | 2015-06-17 | 2016-12-22 | 中兴通讯股份有限公司 | Fax control method and gateway device |
| CN106331423A (en) * | 2015-06-17 | 2017-01-11 | 中兴通讯股份有限公司 | Fax control method and gateway device |
| EP3297223A4 (en) * | 2015-06-17 | 2018-06-20 | ZTE Corporation | Fax control method and gateway device |
| CN111669475A (en) * | 2020-05-06 | 2020-09-15 | 深圳震有科技股份有限公司 | Fax system response method, fax system and storage medium |
| CN111669475B (en) * | 2020-05-06 | 2021-12-10 | 深圳震有科技股份有限公司 | Fax system response method, fax system and storage medium |
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