CN101459493A - IP fax system based on T.38 and method for enhancing switching-on rate - Google Patents
IP fax system based on T.38 and method for enhancing switching-on rate Download PDFInfo
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- CN101459493A CN101459493A CNA2008102417184A CN200810241718A CN101459493A CN 101459493 A CN101459493 A CN 101459493A CN A2008102417184 A CNA2008102417184 A CN A2008102417184A CN 200810241718 A CN200810241718 A CN 200810241718A CN 101459493 A CN101459493 A CN 101459493A
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Abstract
The invention discloses an IP facsimile system based on T.38 and a method for increasing the call completing rate thereof, wherein the system comprises a local fax machine, a local media gateway connected with the local fax machine, a counterpart fax machine, and a counterpart media gateway connected with the counterpart fax machine, wherein the local media gateway is connected with a counterpart media gateway network, the local media gateway is used to modulate signals for the local fax machine instead of the counterpart fax machine when waiting a network side T.30 event, and conducts the T.30 signaling cheat, and then transmits to the modulation of T.30 signal while waiting the arrival or normal restoration of a counterpart message. The invention avoids the linkage interruption caused by the overtime of a timer inside the fax machine in the T.38 relay facsimile posting, makes the fax machine without disconnecting in the T.30 signaling agreement process, and increases the call completing success rate of the T.38 relay fax.
Description
[technical field]
The present invention relates to the communications field, particularly based on the method that improves the fax call completing rate in the Fax over IP system relay processes T.38.
[background technology]
Along with Internet development, the T.38 agreement of carrying out the real-time fax relaying in IP network has also obtained increasing application.T.38 the modulation signal demodulation that the facsimile machine that connects can be sent of gateway is packaged into the T.38 message of agreement regulation with demodulated data, issues the other side's gateway by IP network.The opposite end gateway is separated out data from message, and modulation is to the facsimile machine of its connection.
T.30 Signalling exchange between the Group 3 Facsimile Equipment is used for both sides and consults and shake hands.Under the environment of fax T.38, media gateway in the TDM side with the signaling T.30 of pattern modulation v.21, mutual with facsimile machine; With standard packaging T.38 with resolve data message, mutual at network side with the other side's media gateway.
In T.38 relaying is faxed, might run into T.38 message dropping that the other side's gateway sends, delay and out of order etc., one's own side's facsimile machine can be provided with some timers simultaneously, under specific state, if do not receive the modulation signal of the other side's facsimile machine, these timers will be overtime, and facsimile machine then can break.
[summary of the invention]
Main purpose of the present invention is: provide a kind of Fax over IP system and corresponding data processing methods based on T.38, to improve call completing rate.
For this reason, the present invention proposes a kind of Fax over IP system based on T.38, comprise local facsimile machine, the media gateway local that is connected with local facsimile machine, the other side's facsimile machine and the other side's media gateway that is connected with the other side's facsimile machine; Media gateway local is connected with the other side's media gateway network; Waiting for that network side T.30 during incident, replaces the other side's facsimile machine to the local facsimile machine modulation signal by media gateway local, carrying out T.30 signaling and cheat, waiting for that simultaneously the other side's message arrives or recovers normal, carries out the transition to the T.30 modulation of signal again.
Above-mentioned Fax over IP system based on T.38, it is characterized in that: described the other side's media gateway or our media gateway are provided with T.30 state machine, for each state, indicate under the normal fax flow process this state wait for down which kind of T.30 incident take place, and receive one and T.30 need the state that is transitted towards after the incident.Described T.30 incident is defined by two tuples: the FCF field value of signaling T.30; T.30 signaling from direction be network side or TDM side.
Above-mentioned Fax over IP system based on T.38 describedly carries out the process that signaling is T.30 cheated, and comprises following steps:
41) media gateway is waited for the T.30 signaling of network side or TDM side;
42), then it is resolved the back and directly modulate, and promote the state machine transition to the TDM bus if receive T.30 incident of network side;
43), then issue the other side's gateway, and promote state machine being encapsulated as T.38 message after its demodulation if receive the T.30 modulation signal of signaling of TDM side; Judge under the next state that is transitted towards simultaneously, whether wait for T.30 incident of network side;
44) if, and the current T.30 incident of network side of not receiving then generates continuous targeting signal, modulation cheats for the TDM bus, this process is continuously the longest predetermined modulating time T1 that cheats.
Simultaneously, the present invention proposes a kind of method of raising call completing rate of the Fax over IP system based on T.38, waiting for that network side is T.30 during incident, replace the other side's facsimile machine to our facsimile machine modulation signal by media gateway, carrying out T.30 signaling cheats, wait for that simultaneously the other side's message arrives or recovery is normal, carry out the transition to the T.30 modulation of signal again.
The method of above-mentioned raising call completing rate, described media gateway is provided with T.30 state machine, for each state, indicate under the normal fax flow process this state wait for down which kind of T.30 incident take place, and receive one and T.30 need the state that is transitted towards after the incident; Described T.30 incident is defined by two tuples: the FCF field value of signaling T.30; T.30 signaling from direction be network side or TDM side.
The method of above-mentioned raising call completing rate comprises following steps:
81) media gateway is waited for the T.30 signaling of network side or TDM side;
82), then it is resolved the back and directly modulate, and promote the state machine transition to the TDM bus if receive T.30 incident of network side;
83), then issue the other side's gateway, and promote state machine being encapsulated as T.38 message after its demodulation if receive the T.30 modulation signal of signaling of TDM side; Judge under the next state that is transitted towards simultaneously, whether wait for T.30 incident of network side;
84) if, and the current T.30 incident of network side of not receiving then generates continuous targeting signal, modulation cheats for the TDM bus, this process is continuously the longest predetermined time T 1 of cheating.
The method of above-mentioned raising call completing rate is in described step 84) cheat in the process, if receive T.30 incident of network side, then stop to cheat, with this network side of receiving T.30 message modulate bus to TDM.In described step 84) in, if exceed the longest described modulating time T1 that cheats, also do not receive T.30 incident of network side, media gateway stops T.38 fax relay.
The present invention is in relaying facsimile posting T.38, replace the other side's facsimile machine to modulate some necessary signals by media gateway to our facsimile machine, carrying out T.30 signaling cheats, avoid causing connection to be interrupted because of the facsimile machine timer internal is overtime, wait for that simultaneously the other side's message arrives or recovery is normal, and then carry out the transition to the T.30 modulation of signal smoothly, and T.30 facsimile machine is not being broken in the command negotiation process, improve the T.38 connection success rate of relaying fax of son.
[description of drawings]
Fig. 1 is based on Fax over IP system construction drawing T.38;
Fig. 2 is that media gateway is carried out the flow chart that signaling is T.30 cheated in the embodiment of the invention;
Fig. 3 is the sequence chart of cheating when demodulating TDM side DIS incident in the embodiment of the invention;
Fig. 4 is the sequence chart of cheating when demodulating TDM side MPS incident in the embodiment of the invention.
[embodiment]
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Please refer to shown in Figure 1ly,, comprise local facsimile machine, the media gateway local that is connected with local facsimile machine, the other side's facsimile machine and the other side's media gateway that is connected with the other side's facsimile machine for based on T.38 Fax over IP system construction drawing; Media gateway local is connected with the other side's media gateway network.Media gateway local and the other side's media gateway are provided with T.30 state machine, the T.30 signaling that T.38 parses in the message with network side that this state machine demodulates according to the TDM side is with its state of transition, for each state, must be able to indicate under the normal fax flow process this state wait for down which kind of T.30 incident take place, and receive one and T.30 need the state that is transitted towards after the incident; This incident is defined by two tuples: 1, the FCF field value of signaling T.30; 2, T.30 signaling from direction, network side/TDM side.
Please refer to shown in Figure 2ly, media gateway is carried out the T.30 method of cheating of signaling to facsimile machine in the T.38 fax relay process of this example, comprises the steps:
Step 1, executable operations be state machine initialization 100 T.30;
Step 2 judges whether to receive T.30 incident of network side, if, then resolve and modulate to TDM bus (operation 102), and according to T.30 incident promotion state machine transition (operation 103).
Step 3 judges whether to receive T.30 incident of TDM side, if then forward step 4 to; Otherwise continue to detect T.30 incident of network side/TDM side.
Step 4, judge whether the purpose state of transition under this state waits for T.30 incident of network side, if, then begin to cheat flow process: give the TDM bus with V.21 modulating continuous 0x7E, and establish that timer is the longest and cheat (modulation) time T 1 (operation 104), and promote state machine transition (operation 103) according to incident T.30, the other side's gateway (operation 107) is issued in the T.30 message packing of demodulation, according to T.30 incident promotion state machine transition (operation 103), and change step 5 over to.If not, then the other side's gateway (operation 107) is issued in the T.30 message packing of demodulation,, and continued to detect T.30 incident of network side/TDM side according to T.30 incident promotion state machine transition (operation 103).According to the permission duration that the facsimile machine timer internal interrupts modulation signal in connecting, the longest modulating time T1 that cheats of timer can be set at this permission duration.
Step 5 detects the T.30 incident of network side of whether receiving, if, T.30 the message that then will parse is right after to modulate behind the 0x7E targeting signal gives the TDM bus, according to T.30 incident promotion state machine transition 103, continue then to detect T.30 incident of network side/TDM side, flow process is reset.If not, check then whether the T1 timer is overtime, the overtime T.38 relaying that then finishes does not have the overtime step 5 that then continues.
As shown in Figure 3, the sequence chart of cheating when demodulating TDM side DIS incident is cheated in the modulating time T1 the longest, and media gateway local modulation tonal signal carries out the T30 signaling to local facsimile machine and cheats.As shown in Figure 4, the sequence chart of cheating when demodulating TDM side MPS incident is cheated in the modulating time T1 the longest, and T.30 media gateway local modulation tonal signal carries out signaling to local facsimile machine and cheat.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.For example, the longest modulating time T1 that cheats of timer sets flexibly, suitably exceeds the permission duration that the facsimile machine timer internal interrupts modulation signal in connecting.
Claims (10)
1. based on T.38 Fax over IP system, comprise local facsimile machine, the media gateway local that is connected with local facsimile machine, the other side's facsimile machine and the other side's media gateway that is connected with the other side's facsimile machine; Media gateway local is connected with the other side's media gateway network; It is characterized in that: waiting for that network side T.30 during incident, replaces the other side's facsimile machine to the local facsimile machine modulation signal by media gateway local, carrying out T.30 signaling and cheat, waiting for that simultaneously the other side's message arrives or recovers normal, carries out the transition to the T.30 modulation of signal again.
2. the Fax over IP system based on T.38 as claimed in claim 1, it is characterized in that: described the other side's media gateway or our media gateway are provided with T.30 state machine, for each state, indicate under the normal fax flow process this state wait for down which kind of T.30 incident take place, and receive one and T.30 need the state that is transitted towards after the incident.
3. the Fax over IP system based on T.38 as claimed in claim 2, it is characterized in that: described T.30 incident is defined by two tuples: the FCF field value of signaling T.30; T.30 signaling from direction be network side or TDM side.
4. as claim 2 or 3 described Fax over IP systems based on T.38, it is characterized in that: describedly carry out the process that signaling is T.30 cheated, comprise following steps:
41) media gateway is waited for the T.30 signaling of network side or TDM side;
42), then it is resolved the back and directly modulate, and promote the state machine transition to the TDM bus if receive T.30 incident of network side;
43), then issue the other side's gateway, and promote state machine being encapsulated as T.38 message after its demodulation if receive the T.30 modulation signal of signaling of TDM side; Judge under the next state that is transitted towards simultaneously, whether wait for T.30 incident of network side;
44) if, and the current T.30 incident of network side of not receiving then generates continuous targeting signal, modulation cheats for the TDM bus, this process is continuously the longest predetermined modulating time T1 that cheats.
5. method based on the raising call completing rate of T.38 Fax over IP system, waiting for that network side is T.30 during incident, replace the other side's facsimile machine to our facsimile machine modulation signal by media gateway, carrying out T.30 signaling cheats, wait for that simultaneously the other side's message arrives or recovery is normal, carry out the transition to the T.30 modulation of signal again.
6. the method for raising call completing rate as claimed in claim 5, it is characterized in that: described media gateway is provided with T.30 state machine, for each state, indicate under the normal fax flow process this state wait for down which kind of T.30 incident take place, and receive one and T.30 need the state that is transitted towards after the incident.
7. the method for raising call completing rate as claimed in claim 6 is characterized in that: described T.30 incident is defined by two tuples: the FCF field value of signaling T.30; T.30 signaling from direction be network side or TDM side.
8. as the method for claim 6 or 7 described raising call completing rates, it is characterized in that: comprise following steps:
81) media gateway is waited for the T.30 signaling of network side or TDM side;
82), then it is resolved the back and directly modulate, and promote the state machine transition to the TDM bus if receive T.30 incident of network side;
83), then issue the other side's gateway, and promote state machine being encapsulated as T.38 message after its demodulation if receive the T.30 modulation signal of signaling of TDM side; Judge under the next state that is transitted towards simultaneously, whether wait for T.30 incident of network side;
84) if, and the current T.30 incident of network side of not receiving then generates continuous targeting signal, modulation cheats for the TDM bus, this process is continuously the longest predetermined time T 1 of cheating.
9. the method for raising call completing rate as claimed in claim 8 is characterized in that: in described step 84) cheat in the process, if receive T.30 incident of network side, then stop to cheat, with this network side of receiving T.30 message modulate bus to TDM.
10. the method for raising call completing rate as claimed in claim 8 is characterized in that: in described step 84) in, if exceed the longest described modulating time T1 that cheats, also do not receive T.30 incident of network side, media gateway stops T.38 fax relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102417184A CN101459493B (en) | 2008-12-29 | 2008-12-29 | IP fax system based on T.38 and method for enhancing switching-on rate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102417184A CN101459493B (en) | 2008-12-29 | 2008-12-29 | IP fax system based on T.38 and method for enhancing switching-on rate |
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| CN101459493A true CN101459493A (en) | 2009-06-17 |
| CN101459493B CN101459493B (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008102417184A Expired - Fee Related CN101459493B (en) | 2008-12-29 | 2008-12-29 | IP fax system based on T.38 and method for enhancing switching-on rate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334872C (en) * | 2004-11-05 | 2007-08-29 | 华为技术有限公司 | Method and system for realizing T38 protocol fax automatic test |
| CN101064537A (en) * | 2006-04-29 | 2007-10-31 | 华为技术有限公司 | Method, equipment and system for managing faxes service in IP/packet network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN101459493B (en) | 2011-08-24 |
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