CN101159802B - Method of T.38 gateway to guarantee reliable transmission of disconnection command to electrograph - Google Patents
Method of T.38 gateway to guarantee reliable transmission of disconnection command to electrograph Download PDFInfo
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- CN101159802B CN101159802B CN2007101814721A CN200710181472A CN101159802B CN 101159802 B CN101159802 B CN 101159802B CN 2007101814721 A CN2007101814721 A CN 2007101814721A CN 200710181472 A CN200710181472 A CN 200710181472A CN 101159802 B CN101159802 B CN 101159802B
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Abstract
The invention relates to a method to reliable transmission of a T.38 gateway-ensured disengage order to a facsimile machine. When the gateway acts as a sender, the gateway packs a DCN signal detected on a TDM side into an IFP package and then sends the DCN signal to an IP side; after a scheduled time, the gateway will report the facsimile end incident to a soft switch to ensure the DCN signal completely reaches the receiving facsimile machine; after receiving the facsimile end incident of the soft switch, the soft switch sends down the state switch order and switches the two gateways back to the voice state. When the gateway acts as a receiver, the gateway modules the DCN signal detected by the IP side and transmits to the receiving facsimile machine; if the gateway receives the switch order from the soft switch during the DCN signal transmission process, then the switch operation will be delayed; if the DCN data are complete in transmission and the gateway hasn't received the switch order from the soft switch yet, then the gateway actively reports the facsimile end incident to the soft switch. The method is capable of reliably detecting the facsimile end incident, reliably transmitting the DCN signal to the terminal facsimile machine and being compatible with the existing gateway.
Description
Technical field
The facsimile art field that the present invention relates to communicate by letter relates in particular in a kind of IP real-time fax mode the how method of assuring clearing command reliable thansmision tofacsimile of gateway T.38.
Background technology
Along with the maturation of popularizing of using of Internet and technology, make traditional facsimile message be carried on Internet and go up transmission and become possibility that therefore, the correlation technique of Fax over IP is also just arisen at the historic moment.Fax over IP can be divided into according to real-time characteristic: fax, IP real-time fax are transmitted in the IP storage.The IP real-time fax divides again according to the gateway processes mode: transparent transmission mode and mode T.38.The transparent transmission mode is because of its anti-network harm ability, and is not used more widely; T.38 IP real-time fax gateway is mainly finished T.38 protocol processes and DP modulation, and its system configuration as shown in Figure 1.T.38 the Fax over IP basic thought is: at gateway T.38 the data that facsimile machine sends are carried out demodulation, the payload data of demodulation is broken into the T.38 IP bag of agreement regulation, mail to the other side's gateway by IP network; Recipient's T.38 gateway is according to the information characteristic of this IP bag, and the payload data that splits out from the IP bag is modulated again and sent to TDM side facsimile machine.As seen, what the IP real-time fax carried is fax signaling or message information mutual between terminal facsimile machine, and what carry out between two terminal facsimile machine is real time communication, and the fax flow process is followed T.30 agreement, typically faxes flow process as shown in Figure 2.
Usually ip voice (VOIP) gateway had both been supported also support voice business of facsimile service, and the initial condition of gateway is the voice attitude, just switches to T.38 facsimile service when detecting the fax incident; And when detecting the fax completion incident, gateway switches back voice status by the attitude of T.38 faxing, and guarantees can normally carry out voice call behind the fax.In control the NGN network that switches between fax and voice with soft switch, arbitrary end gateway detects the fax reporting events and gives soft switch, soft switch switches to FAX mode with two gateways of signaling, in the same manner, arbitrary gateway detects the soft switch of fax completion reporting events, switches back voice status by the soft switch control gateway of issuing orders by FAX mode.T.30 agreement regulation fax completion has two kinds of situations: first kind of situation, arbitrary facsimile machine send disconnect command (DCN) the notice opposite end facsimile machine that finishes fax, and finish fax; Second kind of situation is that fax takes place unusually, and facsimile machine does not send the DCN disconnect command, takes out stitches but directly carry out signaling.This paper discussion be first kind of situation the time, reliable Detection fax completion incident how, and how to guarantee that gateway detects and hand-off process, can not receive DCN to terminal facsimile machine and impact.As shown in Figure 2, fax flow process success entered stage E, send facsimile machine and send the success of one page fax page, machine sends DCN to receiving faxes, if the machine of receiving faxes can not receive effective DCN signal, can think the fax abnormal ending, send alerting tone, make the fax user take for fax failure, and the machine of in fact receiving faxes has successfully received the correct fax page.Follow-up discussion for convenience, we carry out as giving a definition facsimile machine and gateway at this: send the facsimile machine that facsimile machine refers to send DCN; The machine finger of receiving faxes is received the facsimile machine of DCN; Send gateway and refer to the gateway that links to each other with the facsimile machine that sends DCN; Receive gateway and refer to the gateway that is connected with the facsimile machine of reception DCN.
At present, the technical scheme one that the gateway of prior art adopts as shown in Figure 3, gateway detects the V.21 frame signal of Time Division Multiplexing side demodulate reception, if detect the DCN signal, this gateway is beaten Fax over IP protocol package (IFP bag) as the transmission gateway with the DCN signal and is mail to the reception gateway, after waiting until that simultaneously this frame signal sends end, send gateway and report the fax completion incident to soft switch; End Event is received in soft switch, confirms and simultaneously issues the fax completion order to sending and receiving two gateways; Two gateways are received after the end fax of soft switch is ordered and are switched back voice status respectively.This technical scheme may cause and receive gateway in the machine transmission DCN signal process of receiving faxes, or when also not sending the DCN signal, just received the fax completion order that soft switch issues, gateway status switches to the voice attitude from the fax attitude, cause the machine of receiving faxes not receive effective DCN signal, the machine of receiving faxes can not receive effective DCN signal, can think the fax abnormal ending, send alerting tone, make the fax user take for fax failure.
The technical scheme two that the gateway of prior art adopts as shown in Figure 4, gateway is in facsimile service T.38, data to the IP side detect, if received the DCN frame signal, gateway just sends DCN to the machine modulation of receiving faxes, after sending end, this gateway reports soft switch to finish the fax incident, guarantees that the DCN signal can successfully arrive the machine of receiving faxes.This technical scheme is to rely on IP side signal to fax to switch back voice, does not support the detection of TDM side DCN to report.The shortcoming of the technical program is: if 1 to adopt the gateway of this scheme be to send gateway, just can not receive the DCN signal in the IP side, only do the detection of TDM side if receive gateway this moment, will cause fax completion but not have the problem of fax completion reporting events soft switch.If 2 transmission gateways are gateways of aforementioned techniques scheme one, the phenomenon of technical scheme one described shortcoming may also can appear, and cause the machine of receiving faxes not receive effective DCN signal.
Summary of the invention
The objective of the invention is: provide a kind of DCN of assurance signal reliably to send the method for facsimile machine to, solve gateway in facsimile service T.38, rely on TDM side detection DCN frame signal and report the fax completion incident, may cause the machine of receiving faxes not receive the problem of complete and effective DCN signal;
Another technical problem that the present invention will solve is: gateway rely on the unreliability problem that the IP side detects DCN signal reporting fax completion incident, and the DCN signal can not reliably be sent to the problem of the machine of receiving faxes effectively in facsimile service T.38.
Another purpose of the present invention is: provide a kind of and also can guarantee that the DCN signal reliably sends the method for facsimile machine to existing gateway is compatible, this method can solve gateway in facsimile service T.38, rely on TDM side detection DCN frame signal and report the fax completion incident, may cause the machine of receiving faxes not receive the problem of complete and effective DCN signal; Can solve again and rely on the unreliability problem that the IP side detects DCN signal reporting fax completion incident, and the DCN signal can not reliably be sent to the problem of the machine of receiving faxes effectively.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of method of T.38 gateway to guarantee reliable transmission of disconnection command to electrograph may further comprise the steps:
A, gateway to time division multiplexing side demodulate reception to frame signal detect, if detect the disconnect command signal of fax, then described disconnect command signal is broken into the Fax over IP protocol package and mails to the IP side;
B, described gateway mail to the IP rear flank with described disconnect command signal packing, postpone a scheduled time to give soft switch with the fax completion reporting events again; The described scheduled time receives faxes the needed time of machine for guaranteeing that described disconnect command signal integrity arrives;
C, described soft switch issue state switch command after receiving described fax completion incident, and control sends and receive gateway by FAX mode switchback voice status.
Described method also comprises the steps:
D, described gateway detect the frame signal of IP side, if detect the disconnect command signal, then the machine of receiving faxes are mail in described disconnect command signal modulation;
E, described gateway in the process that sends the disconnect command signal to the described machine of receiving faxes if receive that the state switch command that described soft switch issues, described gateway still continue to send described disconnect command data to the machine of receiving faxes; After described disconnect command data transmission was finished, described gateway just responded described state switch command and switches back voice status;
F, if described disconnect command data send finish after, described gateway is not received the state switch command of described soft switch yet, described gateway initiatively reports the fax completion incident to described soft switch.
Described method, wherein: described step B comprises following processing: described gateway mails to the IP rear flank with described disconnect command signal packing, start a timer and pick up counting, when described timer during to described scheduled time, described gateway is given soft switch with the fax completion reporting events again.
Described method, wherein: the described scheduled time is set to 600ms.
The another kind of T.38 method of gateway to guarantee reliable transmission of disconnection command to electrograph may further comprise the steps:
D, described gateway detect the frame signal of IP side, if detect the disconnect command signal, then the machine of receiving faxes are mail in described disconnect command signal modulation;
G, described gateway in the process that sends the disconnect command signal to the described machine of receiving faxes if receive that the state switch command that described soft switch issues, described gateway still continue to send described disconnect command data to the machine of receiving faxes; After described disconnect command data transmission was finished, described gateway just responded described state switch command and switches back voice status;
F, if described disconnect command data send finish after, described gateway is not received the state switch command of described soft switch yet, described gateway initiatively reports the fax completion incident to described soft switch.
Above-mentioned method one and method two, wherein: described step e and described step F comprise following concrete processing: a marking variable is set in described gateway, is used to identify the state switch command whether described gateway receives described soft switch; After described gateway finishes described disconnect command data transmission, inquire about described marking variable: if described marking variable represents to receive the state switch command of described soft switch, described gateway to the state switch command of described soft switch handle, the switchback voice status; Otherwise described gateway reports the fax completion incident to described soft switch.
Described method, wherein: when described gateway was received the state switch command of described soft switch, described marking variable was set to 1; Otherwise described marking variable is set to 0.
Beneficial effect of the present invention is: adopt technique scheme, no matter gateway is as sending gateway or as receiving gateway in facsimile service T.38, can both reliable Detection fax completion incident, and send the DCN signal to terminal facsimile machine reliably; And this programme also with the existing gateway compatibility, in application, no matter be to communicate with the gateway that adopts prior art scheme one, still communicate with the gateway that adopts prior art scheme two, no matter be promptly as transmit leg or as the recipient, can both reliable Detection fax completion incident, guarantee that the DCN signal integrity arrives facsimile machine; Therefore, have good compatibility, practicality and reliability.
Description of drawings
Fig. 1 is real-time fax system construction drawing T.38
Fig. 2 is typical IP real-time fax flow chart
Fig. 3 is prior art one schematic diagram
Fig. 4 is prior art two schematic diagrames
Fig. 5 is the inventive method flow chart
Fig. 6 is the schematic diagram of the present invention when sending gateway
Fig. 7 is the schematic diagram of the present invention when receiving gateway
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
The present invention sends facsimile machine to reliably in order to guarantee disconnect command, and gateway has been provided different respective handling methods as sending gateway respectively with the reception gateway.Method comprises as shown in Figure 5: the frame signal of the V.21 frame that gateway at first will be received the V.21 frame and the IP side of TDM side demodulate reception judges that if received the DCN signal in the TDM side, gateway adopts the scheme that sends gateway as sending gateway; If gateway has detected the DCN signal in the IP side, gateway adopts the scheme that receives gateway as receiving gateway; May further comprise the steps during as the transmission gateway:
A, referring to Fig. 6, gateway to TDM side demodulate reception to frame signal detect, if detect the DCN signal, described gateway breaks into the Fax over IP protocol package with described DCN signal and mails to the IP side as sending gateway;
B, can have time enough to receive the IFP bag of IP side DCN, and complete modulation sends to the machine of receiving faxes, send gateway the IP rear flank is mail in the packing of DCN signal, postpone a fixed time to give soft switch with the fax completion reporting events again in order to guarantee to receive gateway;
C, described soft switch issue state switch command after receiving described fax completion incident, and control sends and receive gateway by FAX mode switchback voice status.
The delay fixed time of step B indication receives faxes the needed time of machine for guaranteeing that the DCN signal integrity arrives; Because the complete transmission time of DCN signal on the PSTN circuit be 160ms at least, consider 200ms-300ms time of delay that IP network is possible, add the processing time that receives gateway, in practical operation, the fixed time that postpones to report can be selected 600ms, thereby guarantees that the machine of receiving faxes receives DCN before postponing fixed time end.In specific embodiment, step B adopts following method to handle: described gateway mails to the IP rear flank with described DCN signal packing, starts a timer and picks up counting, and timer can adopt software to realize; When the timer timing when the described fixed time (for example 600ms), send gateway again with the fax completion reporting events to soft switch, thereby guarantee that the machine of receiving faxes receives DCN before finishing time of delay.
Referring to Fig. 7, if gateway has detected the DCN signal in the IP side, gateway is when receiving gateway, has the ability that IP side DCN is detected and reports to soft switch the fax completion incident, and in the process that sends the DCN data to the machine of receiving faxes, receive the switching command that soft switch issues, can postpone to switch.Comprise the steps: during therefore, as the reception gateway
D, described gateway detect the frame signal of IP side, if detect the DCN signal, described gateway mails to the machine of receiving faxes as receiving gateway with the modulation of DCN signal;
E, receive gateway in the process that sends the DCN signal to the machine of receiving faxes if receive the state switch command that soft switch issues, receive gateway to not response at once of switching command, promptly do not carry out still continuing to send described DCN data to the machine of receiving faxes from faxing to the hand-off process of voice at once; After the transmission of DCN data was finished, the reception gateway just responded described state switch command and switches back voice status;
F, if described DCN data send finish after, described gateway is not received the state switch command of described soft switch yet, described gateway initiatively reports the fax completion incident to described soft switch.
Above-mentioned steps E and step F comprise following concrete processing procedure: a marking variable is set in described gateway, is used to identify the state switch command whether described gateway receives described soft switch, when receiving switching command, marking variable is changed to 1, otherwise is 0; When receiving gateway when receiving the state switch command that soft switch issues in the process that sends the DCN signal to the machine of receiving faxes, described marking variable is changed to 1; Receive gateway and do not carry out from faxing to the hand-off process of voice at once, but continue to send described DCN data to the TDM side; When the reception gateway sends to the flag of the true ending of DCN, think with after the DCN data transmission end, receive gateway and inquire about described marking variable:, receive gateway and just the state switch command of described soft switch is handled the switchback voice status if described marking variable is 1 state; If described marking variable still is 0 state, illustrate that receiving gateway does not receive the state switch command of described soft switch yet, at this moment, receive gateway and initiatively report the fax completion incident to described soft switch; Thereby guarantee to send gateway and do not possess when TDM side DCN detected reporting ability (is prior art scheme two as what send that gateway adopts), can realize faxing to the switching of voice reliably.
As seen by above-mentioned, technical scheme of the present invention has provided gateway respectively as sending gateway and receive gateway, can both reliable Detection fax completion incident, and DCN is reliably sent to the method for terminal facsimile machine.Simultaneously, the present invention also provides and adopted above-mentioned two kinds of methods simultaneously in a gateway, guarantees that DCN reliably sends the scheme of terminal facsimile machine to; The gateway that adopts this scheme detects the frame type of TDM side and IP side, if detect the DCN signal in the TDM side, just according to the method processing that sends gateway; If detect the DCN signal, just handle according to the method that receives gateway in the IP side; Both solve gateway in facsimile service T.38, and relied on the TDM side and detect the DCN frame signal and report the fax completion incident, and may cause the machine of receiving faxes not receive the problem of complete and effective DCN signal; Solved again and relied on the unreliability that the IP side detects DCN signal reporting fax completion incident, and the DCN signal can not reliably be sent to the problem of the machine of receiving faxes effectively.Said method all is applied in actual gateway product, the gateway that adopts the technical program is with the gateway intercommunication of prior art scheme one or prior art scheme two time, no matter as transmit leg or recipient, can both guarantee the complete arrival facsimile machine of DCN, therefore have good compatibility, practicality, reliability.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. method of gateway to guarantee reliable transmission of disconnection command to electrograph T.38 may further comprise the steps:
A, gateway to time division multiplexing side demodulate reception to frame signal detect, if detect the disconnect command signal of fax, then described disconnect command signal is broken into the Fax over IP protocol package and mails to the IP side;
B, described gateway mail to the IP rear flank with described disconnect command signal packing, postpone a scheduled time to give soft switch with the fax completion reporting events again; The described scheduled time receives faxes the needed time of machine for guaranteeing that described disconnect command signal integrity arrives;
C, described soft switch issue state switch command after receiving described fax completion incident, and control sends and receive gateway by FAX mode switchback voice status.
2. method according to claim 1 is characterized in that: described method also comprises the steps:
D, described gateway detect the frame signal of IP side, if detect the disconnect command signal, then the machine of receiving faxes are mail in described disconnect command signal modulation;
E, described gateway in the process that sends the disconnect command signal to the described machine of receiving faxes if receive that the state switch command that described soft switch issues, described gateway still continue to send described disconnect command data to the machine of receiving faxes; After described disconnect command data transmission was finished, described gateway just responded described state switch command and switches back voice status;
F, if described disconnect command data send finish after, described gateway is not received the state switch command of described soft switch yet, described gateway initiatively reports the fax completion incident to described soft switch.
3. method according to claim 1 and 2, it is characterized in that: described step B comprises following processing: described gateway mails to the IP rear flank with described disconnect command signal packing, starting a timer picks up counting, when described timer during to described scheduled time, described gateway is given soft switch with the fax completion reporting events again.
4. method according to claim 3 is characterized in that: the described scheduled time is set to 600ms.
5. method of gateway to guarantee reliable transmission of disconnection command to electrograph T.38 may further comprise the steps:
D, described gateway detect the frame signal of IP side, if detect the disconnect command signal, then the machine of receiving faxes are mail in described disconnect command signal modulation;
E, described gateway in the process that sends the disconnect command signal to the described machine of receiving faxes if receive that the state switch command that described soft switch issues, described gateway still continue to send described disconnect command data to the machine of receiving faxes; After described disconnect command data transmission was finished, described gateway just responded described state switch command and switches back voice status;
F, if described disconnect command data send finish after, described gateway is not received the state switch command of described soft switch yet, described gateway initiatively reports the fax completion incident to described soft switch.
6. method according to claim 5 is characterized in that: described step e and described step F comprise following concrete processing: a marking variable is set in described gateway, is used to identify the state switch command whether described gateway receives described soft switch; After described gateway finishes described disconnect command data transmission, inquire about described marking variable: if described marking variable represents to receive the state switch command of described soft switch, described gateway to the state switch command of described soft switch handle, the switchback voice status; Otherwise described gateway reports the fax completion incident to described soft switch.
7. method according to claim 6 is characterized in that: when described gateway was received the state switch command of described soft switch, described marking variable was set to 1; Otherwise described marking variable is set to 0.
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| CN2007101814721A CN101159802B (en) | 2005-01-26 | 2005-01-26 | Method of T.38 gateway to guarantee reliable transmission of disconnection command to electrograph |
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| CN2007101814721A CN101159802B (en) | 2005-01-26 | 2005-01-26 | Method of T.38 gateway to guarantee reliable transmission of disconnection command to electrograph |
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| CNB200510033038XA Division CN100555966C (en) | 2005-01-26 | 2005-01-26 | A kind of method of T.38 gateway to guarantee reliable transmission of disconnection command to electrograph |
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| JP5185359B2 (en) | 2010-12-15 | 2013-04-17 | キヤノン株式会社 | MODEM CONTROL DEVICE, ITS CONTROL METHOD, PROGRAM, AND IMAGE PROCESSING DEVICE |
| CN102368731A (en) * | 2011-10-17 | 2012-03-07 | 深圳市共进电子股份有限公司 | Method and system for realizing change from fax service to voice service |
| CN105282390B (en) * | 2014-07-25 | 2019-04-09 | 中兴通讯股份有限公司 | Switching method, apparatus and system of the fax channel to voice channel |
| JP6766696B2 (en) * | 2017-03-06 | 2020-10-14 | コニカミノルタ株式会社 | Information processing system |
| CN110958359B (en) * | 2019-11-01 | 2021-08-06 | 深圳震有科技股份有限公司 | High-delay fax method, intelligent terminal and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1427614A (en) * | 2001-12-17 | 2003-07-02 | 杭州东信北邮信息技术有限公司 | Improved method of realizing point hit facsimile business |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1427614A (en) * | 2001-12-17 | 2003-07-02 | 杭州东信北邮信息技术有限公司 | Improved method of realizing point hit facsimile business |
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| US 2002001373 A1,全文. |
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