CN1324869C - Method for implementing facsimile in next generation network - Google Patents
Method for implementing facsimile in next generation network Download PDFInfo
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- CN1324869C CN1324869C CNB2003101200168A CN200310120016A CN1324869C CN 1324869 C CN1324869 C CN 1324869C CN B2003101200168 A CNB2003101200168 A CN B2003101200168A CN 200310120016 A CN200310120016 A CN 200310120016A CN 1324869 C CN1324869 C CN 1324869C
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Abstract
The present invention relates to a realizing method for facsimile in a next generation network. Media gateways at both ends are communicated; when one media gateway at one end detects facsimile beginning signals, a media gateway controller is informed; the media gateway controller simultaneously sends modifying coding/decoding commands in parallel to two communication parties according to facsimile coding/decoding negotiated by the two parties; if the ports of the media gateways at both ends have no changes during modifying the coding/decoding, the facsimile is carried out; if the port of a certain media gateway at the main end has changes during modifying the coding/decoding, the media gateway controller sends modifying commands to the media gateway at the opposite end, the far end attribute of a real-time transport protocol is modified, and the facsimile is carried out after modification. Before the media gateway detects the facsimile beginning signals, the facsimile coding/decoding is negotiated while negotiating voice coding/decoding. The present invention reduces the switching time of the facsimile, and increases the success rate of facsimile negotiation.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the implementation method of fax in a kind of next generation network (NGN).
Background technology
NGN (next generation network) is development constantly, carries out facsimile service in the NGN network, and following two kinds of implementations are arranged:
A kind of is the transparent transmission mode, promptly adopt G.711 encoding and decoding, as shown in Figure 1, adopt MGCP (H.248 or MGCP) communication between Media Gateway Controller (MGC) and the media gateway (MG), Media Gateway Controller is responsible for the call state relevant with media gateway controlled, and media gateway is finished the conversion of media formats between the heterogeneous networks under the control of Media Gateway Controller.A facsimile machine is connected respectively on the media gateway (MG), in IP network, use G.711 encoding and decoding, G.711 be PCM (pulse code modulation) encoding and decoding standard that voice is carried out 64kbit/s, adopt the transparent transmission mode, the code stream information of narrowband side remained untouched to be packaged in the IP message, is transmitting on the internet by real-time transport protocol (rtp).It is bigger that the transparent transmission mode is influenced by the transmission quality of IP network, when adopting G.711 code encoding/decoding mode, media gateway need be adjusted some parameters of gateway DSP (digital signal processor) according to type of call (as fax, data, text or voice), so that improve transmission quality.Before beginning fax, carry out facsimile negotiation between two facsimile machines, adopt identical encoding/decoding mode.
A kind of is mode T.38, T.38 agreement is the Real-Time IP facsimile transmission standard that ITU-T (International Telecommunication Association) introduces, T.38 defined the process of IP network part terminal room fasystem transmission in the agreement, after facsimile signal was at first passed through the modulation of voice/fax gateway, the form with the Fax over IP bag in IP network transmitted by TCP (transmission control protocol) or UDP (User Datagram Protoco (UDP)).As shown in Figure 2, media gateway (MG) parses signal of consulting between facsimile machine and data-signal, convert T.38 message to, transmitting by real-time transport protocol (rtp) on the internet, T.38 the media gateway of the other end from restoring original facsimile negotiation signal and data-signal the message.For the transparent transmission mode, use T.38 code encoding/decoding mode to realize that on IP fax can improve fax success rate and quality.
In the above-mentioned dual mode, need to consult the fax encoding/decoding mode, because fax is a negotiation mode end to end, therefore when adopting that T.38 mode is faxed, need to switch to T.38 pattern fast between two MG, otherwise the negotiation failed probability between two facsimile machines has just enlarged.When adopting T.38 mode, because after T.38 the DSP (digital signal processor) in some gateway switches to, the port numbers of local terminal may be different with the end-speech slogan before switching, and like this, an other end just needs to revise the far-end attribute of RTP (RTP).Therefore MGC need consider to switch to how apace T.38 pattern.
Whether be illustrated in figure 3 as existing facsimile negotiation realization flow figure, prior art is only consulted the encoding and decoding of voice when voice call, after detecting fax tone, consult to support T.38 again.If support T.38, then Media Gateway Controller (MGC) is revised the encoding and decoding of one of them media gateway (as MG2 among Fig. 3) earlier, after obtaining the RTP local terminal attribute of this MG2, revise the encoding and decoding and the RTP far-end attribute of another one media gateway (as MG1 among Fig. 3) again, if the RTP local terminal port of this MG1 has changed when switching, also need to notify MG2 to revise RTP far-end attribute.With the H.248/MECAMGO Protocol is example, and flow process is as follows:
1, through consulting encoding and decoding speech, MGC sends ADD (increase) order to MG1, obtains local terminal RTP endpoint attribute in ADD Reply (response).
2, MGC sends the ADD order to MG2, is with far-end RTP endpoint attribute in the ADD order, obtains local RTP endpoint attribute in ADD Reply.
3, MGC sends Modify (modification) order to MG1, revises the far-end attribute of RTP end points.
4, after both sides conversed beginning, facsimile machine sent the fax commencing signal, and MG1 detects the fax commencing signal, by Notify (notice) order notice MGC.
5, through consulting the fax encoding and decoding, can adopt T.38 mode or transparent transmission mode, if determine to use T.38 mode, then MGC sends the Modify order to MG2 and revises encoding and decoding for T.38.Because the local RTP port numbers of MG2 may change, thereby may obtain new local terminal RTP port numbers in Reply (response).
6, MGC sends the Modify order to MG1 and revises encoding and decoding for T.38, is with far-end RTP attribute, if the local RTP port numbers of MG2 has changed, then the RTP far-end attribute of MG1 is also revised in the Modify order simultaneously.Because the local RTP port numbers of MG1 may change, thereby may obtain new local terminal RTP port numbers in Reply.
7, MGC preserves the local terminal RTP port numbers of MG1 and MG2 and the Reply that receives compares, and just knows whether local terminal RTP port numbers has changed.If the local RTP port numbers of MG1 has changed, MGC sends the Modify order to MG2 and revises RTP far-end attribute.
The shortcoming of prior art is after detecting the commencing signal of faxing, and needs through fax coding/decoding negotiation process, after need operating through the MODIFY (modification) of at least 2 serials then, could switch to T.38 pattern fully.If the one or both ends port numbers changes, then need MODIFY (modification) operation of 3 serials just can switch to T.38 pattern.Occur to switch from fax beginning incident and finish, the time interval is oversize, causes the fax merit of often failing to consultations.
Summary of the invention
Technical problem to be solved by this invention is: overcome long, frequent the fail to consultations shortcoming of merit of existing facsimile negotiation time interval, the implementation method of faxing in a kind of NGN network is provided, reduce the switching time of fax, improve the success rate of facsimile negotiation.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
The implementation method of faxing in this next generation network may further comprise the steps:
When the two ends media gateway is carried out communication, after an end media gateway wherein detects the fax commencing signal, the notice Media Gateway Controller;
The fax encoding and decoding that Media Gateway Controller is consulted according to both sides, the parallel simultaneously media gateway to communication two party sends revises the encoding and decoding order;
If when revising encoding and decoding, the port of two ends media gateway does not change, then begin fax; If when revising encoding and decoding, variation has taken place the local terminal port of a certain media gateway, then Media Gateway Controller sends the modification order to the media gateway of opposite end, and RTP far-end attribute is made amendment, and begins fax after having revised.
If when revising encoding and decoding, variation has taken place the local terminal port of two ends media gateway, then Media Gateway Controller sends the modification order to the media gateway at two ends simultaneously, and RTP far-end attribute is made amendment.
Before media gateway detected the fax commencing signal, when consulting encoding and decoding speech, encoding and decoding were held consultation to fax.
Described fax encoding and decoding comprise G.711 encoding and decoding or T.38 encoding and decoding.
Before media gateway detected the fax commencing signal, the step that both sides connect was as follows:
A, after encoding and decoding hold consultation to voice and fax, Media Gateway Controller sends to a certain media gateway increases order (ADD), obtains the attribute of local terminal real-time transport protocol (rtp) end points in return messages;
B, Media Gateway Controller send to another media gateway increases order (ADD), is with far-end RTP endpoint attribute in the ADD order, obtains local terminal RTP endpoint attribute in return messages;
C, Media Gateway Controller send to described first media gateway and revise order (Modify), revise the far-end attribute of RTP end points;
After d, modification were finished, both sides connected, and converse.
Beneficial effect of the present invention is: in the flow process of the present invention, begin to handover success from detecting fax, lacked fax coding/decoding negotiation process than existing scheme, simultaneously when switching encoding and decoding under the constant situation of port numbers, the MODIFY of 2 serials of prior art order is revised as 1 parallel MODIFY order, under the situation that port numbers changes when switching encoding and decoding, the MODIFY of 3 serials of prior art order is revised as 2 parallel MODIFY orders at the most, reduce fax beginning incident so greatly and occurred to the time that switching is finished, improved the success rate of facsimile negotiation.
Description of drawings
Fig. 1 realizes schematic diagram for the fax that adopts the transparent transmission mode;
Fig. 2 adopts the T.38 fax realization schematic diagram of mode;
Fig. 3 is existing facsimile negotiation realization flow figure;
Fig. 4 is facsimile negotiation realization flow figure of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
The present invention has reduced fax switching time by the facsimile negotiation realization flow being optimized, reaching, and improves the purpose of facsimile negotiation success rate.In voice call, consult the encoding and decoding of voice and fax simultaneously, the coding/decoding negotiation process with fax shifts to an earlier date like this, has reduced after detecting the fax commencing signal and has finished the required time to the encoding and decoding switching.If support T.38, detect fax tone after, the parallel simultaneously media gateway to communication two party sends revises the encoding and decoding order.If when revising encoding and decoding, variation has taken place the local terminal port of a certain media gateway, then Media Gateway Controller sends the modification order to the media gateway of opposite end, and RTP far-end attribute is made amendment.If when revising encoding and decoding, variation has taken place the local terminal port of two ends media gateway, then Media Gateway Controller sends the modification order to the media gateway at two ends simultaneously, and RTP far-end attribute is made amendment.
Be illustrated in figure 4 as facsimile negotiation realization flow figure of the present invention, flow process following (H.248 to be example):
1, in voice call, consult the encoding and decoding of voice and fax simultaneously, the fax encoding and decoding can be adopted T.38 mode or transparent transmission mode, in the present embodiment, adopt T.38 the mode encoding and decoding of faxing.MGC sends ADD (increase) order to MG1, obtains local terminal RTP endpoint attribute in ADD Reply (return messages).
The basic principle of consulting the voice call encoding and decoding is that caller MGC passes to called MGC to the encoding and decoding speech that can support (if calling and called are in same MGC, then directly in the inner negotiation of MGC), called coding/decoding capability and the selection strategy of supporting according to self determined an encoding and decoding speech, and the notice caller.Consult voice and fax encoding and decoding simultaneously, be exactly when consulting the voice call encoding and decoding, caller simultaneously with on the fax encoding and decoding that can support, called fax encoding and decoding of supporting according to self and selection strategy are determined the encoding and decoding of a fax, in notice caller encoding and decoding speech also with on selected fax encoding and decoding.
2, MGC sends the ADD order to MG2, is with far-end RTP endpoint attribute in the ADD order, obtains local RTP endpoint attribute in ADD Reply.
3, MGC sends Modify (modification) order to MG1, revises the far-end attribute of RTP end points.
4, after both sides conversed beginning, facsimile machine sent the fax commencing signal, and MG1 detects the fax commencing signal, by Notify (notice) order notice MGC.
5, because the fax encoding and decoding are to adopt T.38 mode, then MGC sends the Modify order to MG1 and revises encoding and decoding for T.38, owing to after T.38 some DSP switch to, need the change port numbers, therefore, in Reply (return messages), may obtain new local terminal RTP port numbers.
6, above-mentioned the 5th step, MGC is parallel simultaneously to send Modify order modification encoding and decoding for T.38 to MG2, also may obtain new local terminal RTP port numbers in Reply.
7, MGC preserves the local terminal RTP port numbers of MG1 and MG2 and the Reply that receives compares, and determines whether local terminal RTP port numbers has changed.If the local terminal RTP port numbers of MG2 has changed, then MGC sends the Modify order to MG1 and revises RTP far-end attribute.
If the local terminal RTP port numbers of 8 MG1 has changed, then MGC sends the Modify order to MG2 and revises RTP far-end attribute.
Encoding and decoding switch to the situation of T.38 encoding and decoding and for fax, port numbers may change, in the above-mentioned steps 7,8, if variation has taken place in the local terminal port of a certain media gateway, then Media Gateway Controller sends the modification order to the media gateway of opposite end, RTP far-end attribute is made amendment, begin fax after having revised.If variation has taken place the two ends port numbers, then the parallel simultaneously media gateway to two ends of Media Gateway Controller sends and revises order, and RTP far-end attribute is made amendment, and has revised the back both sides and has begun fax.
Encoding and decoding switch to the G.711 situation of transparent transmission mode for fax, the local RTP port numbers of MG1, MG2 generally can not change, after then passing through above-mentioned steps 4, MGC is parallel simultaneously to be sent the Modify order to MG1 and MG2 and revises encoding and decoding for G.711, after revising successfully, both sides promptly begin fax, the encoding and decoding handoff procedure after so only needing a parallel Modify to order can to finish facsimile signal to begin.
In the flow process of the present invention, begin to handover success from detecting fax, lacked fax coding/decoding negotiation process than existing scheme, simultaneously when switching encoding and decoding under the constant situation of port numbers, the MODIFY of 2 serials of prior art order is revised as 1 parallel MODIFY order, under the situation that port numbers changes when switching encoding and decoding, the MODIFY of 3 serials of prior art order is revised as 2 parallel MODIFY orders at the most, reduce fax beginning incident so greatly and occurred to the time that switching is finished, improved the success rate of facsimile negotiation.
Claims (4)
1, the implementation method of faxing in a kind of next generation network is characterized in that, may further comprise the steps:
When the two ends media gateway is carried out communication, after an end media gateway wherein detects the fax commencing signal, the notice Media Gateway Controller;
The fax encoding and decoding that Media Gateway Controller is consulted according to both sides, the parallel simultaneously media gateway to communication two party send revises fax encoding and decoding order;
If when revising the fax encoding and decoding, the port of two ends media gateway does not change, then begin fax; If when revising the fax encoding and decoding, variation has taken place the local terminal port of a certain media gateway, then Media Gateway Controller sends the modification order to the media gateway of opposite end, and RTP far-end attribute is made amendment, and begins fax after having revised; If when revising the fax encoding and decoding, variation has taken place the local terminal port of two ends media gateway, then Media Gateway Controller is revised order to the media gateway transmission at two ends simultaneously, and RTP far-end attribute is made amendment.
2, the implementation method of faxing in the next generation network according to claim 1 is characterized in that: before media gateway detected the fax commencing signal, when consulting encoding and decoding speech, encoding and decoding were held consultation to fax.
3, the implementation method of faxing in the next generation network according to claim 2 is characterized in that: described fax encoding and decoding comprise G.711 encoding and decoding or T.38 encoding and decoding.
4, the implementation method of faxing in the next generation network according to claim 2 is characterized in that: before media gateway detected the fax commencing signal, the step that both sides connect was as follows:
A, after encoding and decoding hold consultation to voice and fax, Media Gateway Controller sends to a certain media gateway increases order, obtains the attribute of local terminal RTP end points in return messages;
B, Media Gateway Controller send to another media gateway increases order, is with far-end RTP endpoint attribute in increasing order, obtains local terminal RTP endpoint attribute in return messages;
C, Media Gateway Controller send to described first media gateway and revise order, revise the far-end attribute of RTP end points;
After d, modification were finished, both sides connected, and converse.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101200168A CN1324869C (en) | 2003-11-28 | 2003-11-28 | Method for implementing facsimile in next generation network |
| BRPI0408860-3A BRPI0408860A (en) | 2003-11-28 | 2004-11-08 | Method for Implementing Next-Generation Network Fax Services |
| US10/554,958 US20060285171A1 (en) | 2003-11-28 | 2004-11-08 | Method of performing fax in next generation network |
| AU2004310476A AU2004310476A1 (en) | 2003-11-28 | 2004-11-08 | A method of performing fax in the next generation network |
| RU2005129326/09A RU2005129326A (en) | 2003-11-28 | 2004-11-08 | METHOD FOR FAX IMPLEMENTATION IN THE NEXT GENERATION NETWORK |
| PCT/CN2004/001266 WO2005053232A1 (en) | 2003-11-28 | 2004-11-08 | A method of performing fax in the next generation network |
| HK05110802A HK1079021A1 (en) | 2003-11-28 | 2005-11-28 | A method for implementing facsimile in next generation network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101200168A CN1324869C (en) | 2003-11-28 | 2003-11-28 | Method for implementing facsimile in next generation network |
Publications (2)
| Publication Number | Publication Date |
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| CN1622583A CN1622583A (en) | 2005-06-01 |
| CN1324869C true CN1324869C (en) | 2007-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101200168A Expired - Lifetime CN1324869C (en) | 2003-11-28 | 2003-11-28 | Method for implementing facsimile in next generation network |
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| Country | Link |
|---|---|
| CN (1) | CN1324869C (en) |
| HK (1) | HK1079021A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031006B (en) * | 2006-03-03 | 2010-08-25 | 华为技术有限公司 | Sink-bureau multi-service transmitting method based on IP |
| CN101043424A (en) * | 2006-03-24 | 2007-09-26 | 华为技术有限公司 | Data transmission method and system among IP packet network |
| CN101056452B (en) * | 2006-04-18 | 2010-05-12 | 华为技术有限公司 | Method and system for negotiating the voice encoding and decoding format in the communication system |
| CN101155095B (en) * | 2006-09-29 | 2010-09-08 | 华为技术有限公司 | Method, system and gateway for negotiation of data signal detector ability |
| CN101166302B (en) * | 2006-10-16 | 2010-05-19 | 华为技术有限公司 | Service switching method and system |
| CN101166300B (en) * | 2006-10-19 | 2010-05-19 | 华为技术有限公司 | Service switching method and system |
| CN1980472B (en) * | 2006-11-08 | 2010-05-12 | 华为技术有限公司 | Method for mobile communication system to provide network inter-communication function business, apparatus and system |
| CN101217529B (en) * | 2007-01-05 | 2011-06-22 | 华为技术有限公司 | A method, device and system to realize ET.38 faxing business in the Internet |
| CN101060504B (en) * | 2007-04-13 | 2010-12-08 | 中兴通讯股份有限公司 | A method for negotiating the next generation of network media gateway fax switching mode |
| CN101312479B (en) * | 2008-06-27 | 2010-06-09 | 中兴通讯股份有限公司 | Fax mode negotiating method between gateways for network telephone call |
| 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 |
| CN101883112B (en) * | 2010-06-25 | 2014-07-16 | 中兴通讯股份有限公司 | System and method for implementing full control of T30 fax soft switch in next-generation network |
| CN111107231A (en) * | 2019-12-03 | 2020-05-05 | 深圳震有科技股份有限公司 | Method and system for automatically switching to T.38 fax, computer equipment and medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409549A (en) * | 2000-12-01 | 2003-04-09 | 信息产业部电子第三十研究所 | Multifunction facisimile apparatus |
| KR20030056171A (en) * | 2001-12-27 | 2003-07-04 | 한국전자통신연구원 | Method for network adaptive error control in FoIP |
| CN1441337A (en) * | 2002-02-27 | 2003-09-10 | 英业达股份有限公司 | Automatic facscimile management system and method |
-
2003
- 2003-11-28 CN CNB2003101200168A patent/CN1324869C/en not_active Expired - Lifetime
-
2005
- 2005-11-28 HK HK05110802A patent/HK1079021A1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409549A (en) * | 2000-12-01 | 2003-04-09 | 信息产业部电子第三十研究所 | Multifunction facisimile apparatus |
| KR20030056171A (en) * | 2001-12-27 | 2003-07-04 | 한국전자통신연구원 | Method for network adaptive error control in FoIP |
| CN1441337A (en) * | 2002-02-27 | 2003-09-10 | 英业达股份有限公司 | Automatic facscimile management system and method |
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| Publication number | Publication date |
|---|---|
| HK1079021A1 (en) | 2006-03-24 |
| CN1622583A (en) | 2005-06-01 |
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