CN100359883C - Method for realizing V.34 high-speed facsimile through T.38 protocol - Google Patents
Method for realizing V.34 high-speed facsimile through T.38 protocol Download PDFInfo
- Publication number
- CN100359883C CN100359883C CNB2003101023360A CN200310102336A CN100359883C CN 100359883 C CN100359883 C CN 100359883C CN B2003101023360 A CNB2003101023360 A CN B2003101023360A CN 200310102336 A CN200310102336 A CN 200310102336A CN 100359883 C CN100359883 C CN 100359883C
- Authority
- CN
- China
- Prior art keywords
- signal
- facsimile
- gateway
- terminal called
- ansam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000004044 response Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 abstract description 16
- 230000008569 process Effects 0.000 description 11
- 101100226770 Arabidopsis thaliana FAX2 gene Proteins 0.000 description 4
- 230000006855 networking Effects 0.000 description 4
- 101100226768 Arabidopsis thaliana FAX1 gene Proteins 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 101100226769 Caenorhabditis elegans fax-1 gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
Images
Landscapes
- Facsimiles In General (AREA)
- Facsimile Transmission Control (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention discloses a method for realizing a V. 34 high speed facsimile through a T. 38 protocol, which comprises: (1), after a called terminal under a V. 34 high speed facsimile method is switched to a communication line, a V21 Flag signal and a DIS signal, a V. 8 capability zone bit of which is set to be 1, are emitted; (2), according to the V21 Flag signal which is emitted by the called terminal, a media gateway controller emits a T. 38 facsimile switching command to a gateway of a calling terminal party and the gateway of the called terminal party; (3), the V. 8 capability zone bit of the DIS signal which is emitted by the called terminal is set to be 0 by the gateway of the called terminal party, and the setting information of the zone bit is transmitted to the gateway of the calling terminal party, which enables the calling terminal and the called terminal to establish a facsimile calling of a T. 38 mode. The present invention realizes the reliable transmission of high speed facsimile services under an NGN network.
Description
Invention field
The present invention relates to facsimile art, relate in particular to the high-speed facsimile technology under a kind of T.38 agreement (common fax is in transmission protocol on the IP network and agreement).
Background technology
V.34 fax is the modulation-demodulation technique that adopts MODEM V.34, realizes a kind of fax mode of high-speed message transmission according to the transmission protocol of protocol definition T.30, because V.34 the message transmissions speed (33.6K) of fax is greater than the message transmissions speed (the highest 14.4K) of common fax, so V.34 fax also is called V.34 high-speed facsimile.
V.34 high-speed facsimile has following characteristics:
1, must use error code correction (ECM)
2, support the message transmissions speed of 33.6K
3, V.34 the high-speed facsimile terminal belongs to the G3 Terminal Type
4, the beginning rules according to regulation in V.8 start fax
Under NGN (next generation network) network, voice, facsimile service carry by IP, because facsimile signal is disturbed responsive to external world, add that TDM (time division multiplexing) transmission reliably changes insecure IP/UDP (Internet protocol/User Datagram Protoco (UDP)) transmission into originally, so the facsimile service under the NGN is subjected to the influence of IP network shake and packet loss bigger.For addressing this problem, ITU-T (ITU Telecommunication Standardization Sector) has formulated T.38 standard, but this standard has only been described rules and agreement that common fax transmits on IP network, do not relate to V.34 high-speed facsimile.
At present can the mode of transparent transmission FAX signal realizes high-speed facsimile by adopting G.711.But this method is had relatively high expectations to IP network, requires shake＜10ms, packet loss＜1%, and the IP network of practical commercial operation is difficult to reach above-mentioned requirements.If the shake of IP network and packet loss surpass this threshold value, high-speed facsimile is called out and is easy to failure.
In addition, open and patent name disclosed a kind of voice transparent transmission mode that adopts for the Chinese patent application of " the IP network communication equipment with facsimile communication function " discloses and has realized the V.34 method of high-speed facsimile in the CN1417987A text on May 14th, 2003, promptly indicate functions such as closing fax tone detection, echo elimination and the control of fluctuation absorption buffering, and then facsimile signal is transmitted in voice channel as voice signal by on equipment, detecting CNG and CED signal.Because this patented method is to adopt the mode of voice transparent transmission FAX signal, therefore and unresolved employing T.38 agreement realize the V.34 problem of high-speed facsimile.
Summary of the invention
Therefore, in order to solve the problem that can't adopt agreement T.38 to realize high-speed facsimile in the prior art, the present invention proposes and a kind ofly realize V.34 high-speed facsimile method by agreement T.38.This method may further comprise the steps:
1) make terminal called under the high-speed facsimile mode V.34 after switching on the communication line, send V21 Flag signal and V.8 the capability flags position be set to 1 DIS signal;
2) the V21 Flag signal that sends according to terminal called of Media Gateway Controller sends T.38 facsimile switching command to the gateway of described calling terminal side and the gateway of terminal called side;
3) the V.8 capability flags position in the described DIS signal that sends of the described terminal called of described terminal called side's gateway is set to 0, and is sent to the gateway of described calling terminal side, makes described calling terminal and terminal called set up the T.38 facsimile call of pattern.
In said method, described step 1) comprises:
1-1) terminal called sends signal ANSam to calling terminal;
1-2) make described terminal called can not receive the response of calling terminal in the time limit to described ANSam signal at ANSam;
After 1-3) described terminal called is limited to when ANSam, send V21 Flag signal and V.8 the capability flags position be set to 1 DIS signal.
Preferably, described step 1-2) realize by the following method: terminal called side's gateway is not notified Media Gateway Controller after detecting the ANSam answer signal of terminal called, and the ANSam answer signal is filtered out from voice flow.
Preferably, above-mentioned steps 3) further comprise: after terminal called side's gateway detects V21 Flag signal, give described medium control gateway the V21Flag reporting events.
Described terminal called and calling terminal can be the G3 facsimile machine.
The standard T.38 of the invention solves at present can't realize the problem of high-speed facsimile, can realize the reliable transmission of high-speed facsimile service under the NGN network.In addition,, thereby reduced requirement, can save to improving the needed extra expenses of QOS (service quality) of IP network to IP network because the present invention adopts the high-speed facsimile service of T.38 realizing under the NGN network.
Brief description of drawings
Fig. 1 is a high-speed facsimile call setup flow process V.34;
Fig. 2 of the present inventionly realizes the V.34 networking diagram of high-speed facsimile by agreement T.38;
Fig. 3 of the present inventionly realizes the V.34 flow chart of high-speed facsimile by agreement T.38.
Embodiment
Explain specific embodiments of the present invention below in conjunction with accompanying drawing.Before being described, elder generation describes as follows to some terms involved in the present invention, and more detailed description can be referring to V.8 agreement and the T.30 content of agreement.
Answer signal ANSam, this signal are amplitude-modulated signal, by supporting that V.8 the data circuit terminating equipment of ability sends;
The CM signal, promptly call menu by supporting that V.8 the data circuit terminating equipment of ability sends, offers the selection that calling both sides is carried out modulating mode, agreement, non-standard capabilities;
The CNG single-tone is the single-tone of 1100HZ, is used for fax, indication caller data circuit terminating equipment;
The DIS signal is the figure denote signal, offers the negotiation that calling both sides is carried out modem mode, agreement, fax ability;
The CI signal is a function index signal V.8, and being used to indicate calling terminal is non-traffic terminal;
The JM signal, with the CM class signal seemingly, be by the call menu signal of supporting that the data circuit terminating equipment of ability V.8 sends, offer the selection that calling both sides is carried out modulating mode, agreement, non-standard capabilities;
The PHASE B stage is a process before the message transmissions that defines in the T30 fax rules, is made up of ability sign, ability selection and ability affirmation command interaction;
V21Flag, promptly the V21 leader is the 300bps modulation signal, is that the byte sequence of 0X7E is formed by successive value.
For the present invention is described better, below the call establishment of conventional V.34 high-speed facsimile is described in conjunction with Fig. 1 earlier.
Fig. 1 has shown conventional V.34 high-speed facsimile call setup flow process, and the left side is calling party's flow process among the figure, and the right side is callee's flow process.As shown in Figure 1, V.34 the high-speed facsimile flow process of calling out is as follows for traditional foundation:
1, calling terminal is after detecting dialing tone, dial and make dialed terminal bell, behind the dialed terminal bell, reply, automatically or by manual switching to communication line, send the CNG tone signal by calling terminal,, send the facsimile machine of terminal called to by calling party's gateway MGl, media gateway controller MGC and terminal called gateway MG2;
2, terminal called constantly sends answer signal ANSam to calling terminal after switching on the communication line, and this signal is an amplitude-modulated signal, by supporting that V.8 the data circuit terminating equipment of ability (being terminal called) sends herein.When terminal called is limited to (2.6 to 4.0 seconds) when receiving effective CM signal response or ANSam, just stop to send answer signal;
3, after the calling party receives the ANSam answer signal that terminal called sends, calling terminal is switched on the circuit, calling terminal sends the CNG single-tone and starts the detection of ANSam response signal;
4, if calling terminal does not detect the ANSam signal, but receive that in the 300bit/s mode V.8 the capability flags position is set to 1 DIS signal or V21 Flag signal, then begin V.8 rules once more with the method that sends the CI signal; If calling terminal receives that in the 300bit/s mode capability flags position V.8 is 0 DIS signal, then enters the PHASE B stage of common fax;
5, if calling terminal detects the ANSam signal, then respond with CM;
6, if terminal called detects the CI signal when the response of waiting for the DIS signal, then retransmit ANSam, entering V.8 mode, otherwise enter the PHASE B stage of common fax;
7, the CM response that terminal called is not received calling terminal yet if be limited to during ANSam, then terminal called uses the binary code signal rules of 300bit/s modulation to be handled, be about in the DIS signal V.8 capability flags position 1 and send out the DIS signal, before sending the DIS signal, can send V21 Flag signal to calling terminal; If terminal called is received the CM response, then stop paying out ANSam, carry out the rules that V.8 suggestion is described, reply the JM signal;
8, after calling terminal is received the JM signal that terminal called sends, whether there is the duplex indication to judge to it, and, enters the half-duplex flow process or the full duplex flow process of T30 appendix F definition according to judged result.
Owing to T.38 only defined rules and the agreement that common fax transmits on IP network, therefore, the method according to this invention is for realizing the high-speed facsimile under the pattern T.38, adopted elder generation that high-speed facsimile is reduced to common fax, then the scheme of carrying facsimile service according to agreement T.38.
Fig. 2 is the T.38 networking diagram of agreement realization high-speed facsimile that passes through of the present invention.In Fig. 2, PSTN refers to PSTN, and gateway MGl is calling terminal side's gateway, and facsimile machine FAXl is a calling terminal, and gateway MG2 is terminal called side's gateway, and facsimile machine FAX2 is a terminal called.As the facsimile machine FAX1 of calling party be connected on separately gateway MG1, the MG2 by traditional PSTN earlier as callee's FAX2, carry out data by separately gateway through IP network again and transmit.
Fig. 3 is that T.38 the present invention passes through that agreement realizes the V.34 flow chart of the embodiment of high-speed facsimile.In this embodiment, caller facsimile machine and called facsimile machine all adopt the G3 facsimile machine.With reference to Fig. 2 and Fig. 3, pattern arrives the T.38 conversion of pattern in order to carry out V.34, in this embodiment of the present invention, utilizes V21 Flag as switching to the T.38 means of pattern.In addition, consider that it is to judge that with the value of the V.8 capability flags position in the DIS signal starting V.8 rules carries out high-speed facsimile or carry out common fax that traditional V.34 high-speed facsimile is failed alternately at ANSam/CM after (be ANSam overtime do not receive response), therefore in this embodiment of the present invention, force ANSam/CM to fail alternately, and utilize the V.8 capability flags position in the DIS signal that high-speed facsimile is V.34 reduced to common fax.
In networking shown in Figure 2, gateway MG2 is after detecting the ANSam signal of facsimile machine FAX2, if this filtering signals is fallen, do not pass to opposite end gateway MG1, facsimile machine FAX1 is not owing to receive the ANSam signal, just can not send out the CM signal, facsimile machine FAX2 still confiscates response signal after being limited to when ANSam, will send V21 Flag signal and V.8 the capability flags position be set to 1 DIS signal.After gateway MG2 receives the DIS signal, if the V.8 capability flags position of DIS signal is set to 0, and pass to opposite end gateway MG1, high-speed facsimile will be reduced to common fax, just can carry facsimile service according to agreement T.38 then.
Below in conjunction with Fig. 2 and Fig. 3, specify the step of embodiment of the present invention:
1. in flow process shown in Figure 3, V.34 the high-speed facsimile process of calling out is identical to the process shown in the label 7 and aforesaid foundation for label 1.Be that calling terminal (caller facsimile machine Faxl) to called facsimile machine Fax2 dialing, sends the CNG single-tone, and detect called facsimile machine and whether send response.Called facsimile machine Fax2 still sends answer signal ANSam to caller facsimile machine Fax1 continuously after switching on the circuit;
2. gateway MG2 does not notify MGC (Media Gateway Controller) after detecting the ANSam signal of Fax2, and the ANSam signal is filtered out from voice flow;
3. shown in the label among Fig. 38, after the facsimile machine Fax2 that had before exported the ANSam signal is limited to, send V21Flag when ANSam;
As the label among Fig. 39 to shown in the label 16, gateway MG2 is after detecting V21 Flag, give MGC (Media Gateway Controller) with V21 Flag reporting events, MGC issues T.38 facsimile switching command to the gateway MGl and the MG2 at two ends, and the gateway at two ends enters the pattern of T.38 faxing;
5. shown in the label among Fig. 3 17 to 18, facsimile machine Fax2 sends V21Flag signal and DIS signal, be set to 0 by the V.8 capability flags position in the gateway MG2 DIS signal, then this DIS signal is sent to the gateway MG1 of opposite end, this moment, the both sides facsimile machine can be set up facsimile call according to the pattern of the common fax of routine.
Use method of the present invention can realize the reliable transmission of high-speed facsimile service under the NGN network, solve the problem that present T.38 standard can't realize high-speed facsimile.In addition,, thereby reduced requirement, under the network condition of 5% packet loss, 80ms network jitter, 600ms time delay, all can guarantee the reliable transmission of high-speed facsimile service IP network because the present invention adopts the high-speed facsimile service of T.38 realizing under the NGN network.The extra expenses that need for the QOS (service quality) that improves IP network in actual networking, have been saved like this, as: raising router performance, widen expense such as the network bandwidth.
More than the preferred embodiments of the present invention are described in detail for illustrative purposes; but those of ordinary skill in the art is to be appreciated that; under the situation of scope and spirit of the present invention; various improvement, interpolation and replacement all are possible, and all in the protection range that claim of the present invention limited.
Claims (7)
1. realize the V.34 method of high-speed facsimile by agreement T.38 for one kind, may further comprise the steps:
1) make terminal called under the high-speed facsimile mode V.34 after switching on the communication line, send the V21Flag signal and V.8 the capability flags position be set to 1 DIS signal;
2) the V21Flag signal that sends according to terminal called of Media Gateway Controller sends T.38 facsimile switching command to the gateway of described calling terminal side and the gateway of terminal called side;
3) the V.8 capability flags position in the described DIS signal that sends of the described terminal called of described terminal called side's gateway is set to 0, and is sent to the gateway of described calling terminal side, makes described calling terminal and terminal called set up the T.38 facsimile call of pattern.
2. according to claim 1ly realize the V.34 method of high-speed facsimile, it is characterized in that described step 1) comprises by agreement T.38:
1-1) terminal called sends signal ANSam to calling terminal;
1-2) make described terminal called can not receive the response of calling terminal in the time limit to described ANSam signal at ANSam;
After 1-3) described terminal called is limited to when ANSam, send the V21Flag signal and V.8 the capability flags position be set to 1 DIS signal.
3. according to claim 2ly realize the V.34 method of high-speed facsimile by agreement T.38, it is characterized in that, described step 1-2) comprising: terminal called side's gateway is after detecting the ANSam signal of terminal called, do not notify Media Gateway Controller, and the ANSam signal is filtered out from voice flow.
4. according to claim 1ly realize the V.34 method of high-speed facsimile, it is characterized in that in the described step 1), described terminal called sends the V21Flag signal earlier by agreement T.38, after send V.8 that the capability flags position is set to 1 DIS signal.
5. according to claim 1ly realize the V.34 method of high-speed facsimile, it is characterized in that described step 3) further comprises: after the gateway of described terminal called side detects the V21Flag signal, report to described medium control gateway by agreement T.38.
6. each describedly realizes the V.34 method of high-speed facsimile by agreement T.38 according to claim 1-5, it is characterized in that described terminal called and calling terminal are the G3 facsimile machine.
7. according to claim 6ly realize the V.34 method of high-speed facsimile, it is characterized in that, be limited to 2.6 seconds to 4.0 seconds during described ANSam by agreement T.38.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101023360A CN100359883C (en) | 2003-10-24 | 2003-10-24 | Method for realizing V.34 high-speed facsimile through T.38 protocol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101023360A CN100359883C (en) | 2003-10-24 | 2003-10-24 | Method for realizing V.34 high-speed facsimile through T.38 protocol |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1610372A CN1610372A (en) | 2005-04-27 |
| CN100359883C true CN100359883C (en) | 2008-01-02 |
Family
ID=34756372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101023360A Expired - Fee Related CN100359883C (en) | 2003-10-24 | 2003-10-24 | Method for realizing V.34 high-speed facsimile through T.38 protocol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100359883C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100366041C (en) | 2005-01-21 | 2008-01-30 | 华为技术有限公司 | Method of degrading high speed fax to common fax applied in T.38 gateway |
| CN101252630B (en) * | 2007-12-27 | 2010-06-09 | 华为技术有限公司 | Faxing method, gateway and system |
| CN101316393B (en) * | 2008-07-14 | 2011-06-22 | 中兴通讯股份有限公司 | Method and system for implementing change from speech service to fax service |
| CN101448060B (en) * | 2008-12-23 | 2010-12-29 | 中兴通讯股份有限公司 | Method and system for prohibiting error correction mode during IP faxing |
| CN102629966B (en) * | 2012-03-30 | 2014-10-08 | 华为软件技术有限公司 | Method, device and system for high speed fax machines to achieve low speed fax |
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002185802A (en) * | 2000-12-15 | 2002-06-28 | Ricoh Co Ltd | Color facsimile machine |
| CN1417987A (en) * | 2001-10-17 | 2003-05-14 | 冲电气工业株式会社 | Ip network communication equipment with telefax communication function |
-
2003
- 2003-10-24 CN CNB2003101023360A patent/CN100359883C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002185802A (en) * | 2000-12-15 | 2002-06-28 | Ricoh Co Ltd | Color facsimile machine |
| CN1417987A (en) * | 2001-10-17 | 2003-05-14 | 冲电气工业株式会社 | Ip network communication equipment with telefax communication function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1610372A (en) | 2005-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6882711B1 (en) | Packet based network exchange with rate synchronization | |
| US8693646B2 (en) | Packet based network exchange with rate synchronization | |
| US8526048B1 (en) | Systems and methods for the reliable transmission of facsimiles over packet networks | |
| US7542066B2 (en) | Communication terminal and method for controlling the same | |
| EP1850578B1 (en) | Method for transmitting dcn signals to fax machine ensured by t.38 gateway | |
| US5752199A (en) | Method and apparatus for sending faxes over analog cellular | |
| US8514459B2 (en) | Communication device | |
| US7046382B1 (en) | Network latency recovery for internet gateways | |
| US7639403B2 (en) | Technique for connecting fax machines with advanced capabilities over a network which is not adapted to handle certain protocols | |
| EP1761034B1 (en) | Method for performing fax service and fax service signal processing apparatus on gateway | |
| US20040190499A1 (en) | Method and system for configuring gateways to facilitate a modem connection over a packet network | |
| CN100359883C (en) | Method for realizing V.34 high-speed facsimile through T.38 protocol | |
| US20060067301A1 (en) | Forcing V.34 fax terminals to fallback to legacy G3 modulations over voice over intrnet protocol networks | |
| US8355181B2 (en) | Method for processing non-standard frames by T.38 gateways | |
| US20060028692A1 (en) | Network facsimile apparatus | |
| US20020064168A1 (en) | Two-pass method and apparatus for achieving maximal data compression for a modem relay mode of operation in a voice frame network | |
| US20060285171A1 (en) | Method of performing fax in next generation network | |
| US7310160B2 (en) | Facsimile communication apparatus and method permitting reliable V.17 communication | |
| US8441669B2 (en) | SG3-to-G3 fax spoof | |
| US7623273B1 (en) | Technique for connecting V.34 fax machines via fax relay gateways which are not adapted to support V.34 fax modulation | |
| JP5328624B2 (en) | Image communication apparatus and program for controlling image communication apparatus | |
| JP2005160104A (en) | Method and system for selecting optimal operation mode of asymmetric digital subscriber line (adsl) | |
| JP5709945B2 (en) | Facsimile apparatus, control method of facsimile apparatus, and program | |
| US7299295B1 (en) | High-speed dial-up modem session startup method and apparatus | |
| JP2003092671A (en) | Facsimile machine, control method for the facsimile machine and control program for the facsimile machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080102 |