CN102572144B - Anti-interference method for fax over IP (internet protocol) and IPPBX (Internet Protocol Private Branch Exchange) equipment - Google Patents
Anti-interference method for fax over IP (internet protocol) and IPPBX (Internet Protocol Private Branch Exchange) equipment Download PDFInfo
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- CN102572144B CN102572144B CN2010105902418A CN201010590241A CN102572144B CN 102572144 B CN102572144 B CN 102572144B CN 2010105902418 A CN2010105902418 A CN 2010105902418A CN 201010590241 A CN201010590241 A CN 201010590241A CN 102572144 B CN102572144 B CN 102572144B
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Abstract
The invention provides an anti-interference method for fax over IP (internet protocol) for preventing an interference signal from being picked up by a DSP (Digital Signal Processor) and mistakenly entering a fax state to cause interruption of the normal conversation, comprising the steps of: judging whether a port has a history of successful fax, as the fax machine is normally connected under a fixed port; when the history of successful fax exists, comparing a detected signal with a stored effective signal, taking the detected signal as an effective signal if an error is within an error threshold value, thus effectively filtering an interference signal caused by an environmental factor. Aiming at the fax machine firstly connected to the port, the retransmission mechanism of a V21 (V.21 preamble flags) signal is used, the effectiveness is judged by a condition whether the times that the V21 signal is detected reaches a counting threshold value, thereby filtering the reference signal. Moreover, the effectiveness of the V21 signal is judged after a CED (called equipment identification tone) signal and the V21 signal are detected firstly and lastly, and the reference signal in a color ring can be filtered out.
Description
Technical field
The present invention relates to VOIP (ip voice) technology of data communication field, relate in particular to the fax treatment technology in VOIP.
Background technology
Current operator releases IMS (IP Multimedia System) or soft switchcall server energetically, and VOIP is changing domestic consumer's routine work, and wherein Fax over IP new application on IP network as a traditional business, also more and more generally used.
Due to the complexity of user rs environment, and the impact of the Ring Back Tone service of current increased popularity, Fax over IP also inevitably is subject to the interference of these factors, causes dropped calls when serious.Reason is that Fax over IP is all to realize with DSP (digital signal processor) usually, the signal tone that DSP in IPPBX (stored-program control exchange) faxes by detection for example CED (called equipment indication sound) or V21 (V.21 Preamble Flags, preamble sign) etc. carrys out switching state (from voice, being switched to fax).In client's actual environment and CRBT, inevitably there will be the interference signal with CED or V21 same frequency simultaneously, if DSP detects this interference signal while just being switched to FAX mode, will interrupt original voice, cause the dropped calls problem.Have a strong impact on product quality and the client cognition degree to this emerging service.
By retrieval and understanding, existing product does not all propose a clear and definite total solution.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of signal that avoids interference picked up by DSP and enter mistakenly FAX mode, thus the anti-interference method of the IP carrying fax that causes normal talking to interrupt, and the system that realizes the method.
The present invention solves the problems of the technologies described above adopted technical scheme to be, the anti-interference method of IP carrying fax comprises:
IPPBX detects the CED signal on port, and this port has, and successfully fax is historical, the CED signal level that IPPBX arrives current detection and CED significant level relatively, as current detection to the CED signal level be less than the CED significant level and deduct error threshold, do not start fax; As current detection to the CED signal level be more than or equal to the CED significant level and deduct error threshold, further whether judgement detects the V21 signal after the CED signal at this Port detecting, as no, does not start fax; In this way, the V21 signal level that current detection is arrived and V21 significant level are relatively, as current detection to the V21 signal level be less than the V21 significant level and deduct error threshold, whether the number of times that further judgement is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, do not start fax, in this way, start fax on this port; As current detection to the V21 signal level be more than or equal to the V21 significant level and deduct error threshold, on this port, start fax;
IPPBX detects the CED signal on port, and this port is historical without successfully faxing, and the V21 signal do not detected after the CED signal at this Port detecting as IPPBX, does not start fax; The V21 signal detected again after the CED signal at this Port detecting as IPPBX, whether the number of times that further judgement is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, does not start fax, in this way, starts fax on this port.
The present invention first judges whether port has the successfully history of fax, because facsimile machine all is connected under fixed port usually.When there being successfully fax historical, the useful signal comparison with preservation by the signal that detects, in error threshold, can be considered as equally effective information, can effectively filter the interference signal caused by environmental factor like this.For the facsimile machine that accesses first this port, the present invention utilizes the retransmission mechanism of V21 signal, is consecutively detected V21 signal number of times by judgement and whether reaches count threshold and judge its validity, filters according to this interference signal.And the present invention is after successively CED signal, V21 signal being detected, just the V21 signal is carried out to the validity judgement, can filter the interference signal in CRBT.
Further, after starting fax, IPPBX is monitored facsimile posting, as faxes successfully, preserves CED signal level and V21 signal level that current detection arrives; As fax failure, directly abandon CED signal level and V21 signal level that current detection arrives.
Further, when faxing successfully, IPPBX by current detection to CED signal level and CED significant level be weighted on average, and this average weighted result is upgraded to the CED significant level; IPPBX by current detection to V21 signal level and V21 significant level be weighted on average, and this average weighted result is upgraded to the V21 significant level.
Concrete, the described V21 of being consecutively detected signal number of times is the number of times that the time interval between the signal detected is no more than the V21 signal of time threshold.
Concrete, described error threshold is 3db, and described count threshold is 3 times, and described time threshold is 8s.
The present invention is the IPPBX equipment of realizing said method, comprises that signal detection module, anti-interference process module, fax start module;
Described signal detection module for detection of the facsimile signal on port, triggers the anti-interference process module after the CED signal being detected;
Described anti-interference process module, while for having at port, successfully faxing history, the CED signal level that the anti-interference process module detects the current demand signal detection module and CED significant level are relatively, as current detection to the CED signal level be less than the CED significant level and deduct error threshold, the anti-interference process module is end process; As current detection to the CED signal level be more than or equal to the CED significant level and deduct error threshold, further judge whether signal detection module detects the V21 signal after the CED signal being detected, and as no, the anti-interference process module is end process; In this way, the V21 signal level again current detection arrived and V21 significant level are relatively, as current detection to the V21 signal level be less than the V21 significant level and deduct error threshold, the anti-interference process module further judges whether the number of times that is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, do not start fax, in this way, start fax on this port; As V21 significant level and current detection to the difference of V21 signal level be less than error threshold, the anti-interference process module triggers fax and starts module;
When successfully fax is historical, the V21 signal do not detected at port at Port detecting when signal detection module after the CED signal, the anti-interference process module is end process; The V21 signal detected again after the CED signal at Port detecting when signal detection module, whether the anti-interference process module number of times that further judgement is consecutively detected the V21 signal at signal detection module is more than or equal to count threshold, as no, the anti-interference process module is end process, in this way, the anti-interference process module triggers fax startup module;
Described fax starts module, for the startup on corresponding port, faxes.
Further, described anti-interference process module, also, for after triggering fax startup module, the anti-interference process module is monitored facsimile posting, as faxes successfully, preserves CED signal level and V21 signal level that current detection arrives; As fax failure, directly abandon CED signal level and V21 signal level that current detection arrives.
Further, described anti-interference process module, also for when fax successfully, the anti-interference process module by current detection to CED signal level and CED significant level be weighted on average, and by this average weighted result renewal CED significant level; The anti-interference process module by current detection to V21 signal level and V21 significant level be weighted on average, and this average weighted result is upgraded to the V21 significant level.
Described anti-interference process module judgement is consecutively detected V21 signal number of times, is specially the number of times that the time interval detected between signal is no more than the V21 signal of time threshold.
The invention has the beneficial effects as follows, improve the stability that IPPBX controls facsimile machine.
The accompanying drawing explanation
The schematic diagram that Fig. 1 is IPPBX;
Fig. 2 is the process chart of embodiment to the CED signal;
Fig. 3 is the process chart of embodiment to the V21 signal;
Fig. 4 is the process chart that embodiment is monitored facsimile posting.
Embodiment
As shown in Figure 1, IPPBX equipment, comprise that signal detection module, anti-interference process module, fax start module.
Signal detection module, for detection of the facsimile signals such as CED, V21 of each port;
The anti-interference process module, judged for the fax to detecting, and excludes the interference signal, and filters real facsimile signal and start module to trigger fax;
Fax starts module, for start facsimile posting on corresponding port.
The processing procedure of anti-interference process module is as follows:
After a, signal detection module detect the CED signal on certain port n, the anti-interference process module judges whether this port has successfully fax history; In this way, enter step b; As no, enter steps d;
B, anti-interference process module by current CED signal level and CED significant level relatively, the judgement current detection to the CED signal level be less than the CED significant level and deduct error threshold, in this way, do not start fax, anti-interference process module end process; As no, enter next step;
C, anti-interference process module judge that whether signal detection module detects the V21 signal after the CED signal at this Port detecting, as no, do not start fax, anti-interference process module end process; In this way, the anti-interference process module by current V21 signal level and V21 significant level relatively, judge current detection to the V21 signal level whether be less than the V21 significant level and deduct error threshold, as no, start and fax, anti-interference process module end process; In this way, whether the number of times that further judgement is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, does not start fax, and anti-interference process module end process in this way, starts fax, anti-interference process module end process on this port;
D, anti-interference process module judge that whether signal detection module detects the V21 signal after the CED signal at this Port detecting, as no, do not start fax, end process; In this way, enter next step;
E, anti-interference process module judge whether the number of times that signal detection module is consecutively detected the V21 signal at this port is more than or equal to count threshold; In this way, start fax, end process; As no, do not start fax.
Concrete, the anti-interference process module to the processing of CED signal as shown in Figure 2;
After at first certain port n detects CED signal (the fax recipient first initiates the fax request), whether at first the anti-interference process module detects this port n the successfully record of fax.Once find that port n has the successfully record of fax, the level value CLn1 of the CED signal that current detection is arrived, relatively (error threshold can be configured according to actual conditions to deduct the difference of error threshold with effective CED signal level of the port n preserved in IPPBX, default setting is 3dbm), if CLn1 >=CLn0-3dbm, it is TRUE that CEDFlag is set so, records CLn1, enters the processing to the V21 signal; Otherwise, do not preserve the CED signal of current detection, the CED signal of current detection is made to invalidation.
Immunity module is to the processing of V21 signal as shown in Figure 3:
When 1) port n conversation starts, first by the detection counter V21Cnt zero clearing of V21 signal;
2) when signal detection module after port n detects the V21 signal, whether anti-interference process module detection port n again has successfully the history of fax, in this way, enters step 3), as no, enter step 4);
The history of 3) faxing if any success, effective V21 level VLn0 that the anti-interference process module V21 signal level VLn1 that relatively current detection arrives and IPPBX preserve, enter next step;
The anti-interference process module judges whether to meet VLn1<VLn0-3dbm, as no, enters next step; In this way, whether the number of times that further judgement is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, does not start fax, in this way, enters step 5);
Further judge that whether CEDFlag is TURE, in this way, enters step 5), as no, whether the number of times that further judgement is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, does not start fax, in this way, enters step 5;
4) history as faxed without success, stamp detection time of the V21 signal that anti-interference process module records current detection arrives, and judge that whether current V21Cnt is 0, in this way, enters next step; As no, judge again current detection to the detection time stamp of V21 signal whether be less than or equal to 8 seconds (time interval of normally faxing between the V21 signal is no more than 4 seconds) with the difference of stabbing the detection time of the last V21 signal detected, in this way, enter next step, as no, if V21Cnt=1, return to step 2);
After the anti-interference process module is established V21Cnt=V21Cnt+1, enter next step;
The anti-interference process module judges that whether V21Cnt is more than or equal to 3, in this way, enters step 5), as no, return to step 2);
5) expression port n receives an effective facsimile signal, and it is TRUE that V21Flag is set, and records VLn1, triggers fax and starts module, and enter facsimile posting monitoring processing.
Immunity module is monitored and is processed as shown in Figure 4 facsimile posting:
Whether the fax that the immunity module judgement this time starts faxes successfully, in this way, VLn1 and VL0 is weighted on average, with weighted average, upgrades VLn0, and CLn1 and CLn0 are weighted on average, with weighted average, upgrades CLn0, and preserves VLn0 and CLn0; As no, so directly abandon VLn1 and CLn1 level value.
Claims (10)
1.IP the anti-interference method of carrying fax, is characterized in that, comprising:
IPPBX detects the CED signal on port, and this port has, and successfully fax is historical, the CED signal level that IPPBX arrives current detection and CED significant level relatively, as current detection to the CED signal level be less than the CED significant level and deduct error threshold, do not start fax; As current detection to the CED signal level be more than or equal to the CED significant level and deduct error threshold, further whether judgement detects the V21 signal after the CED signal at this Port detecting, as no, does not start fax; In this way, the V21 signal level that current detection is arrived and V21 significant level are relatively, as current detection to the V21 signal level be less than the V21 significant level and deduct error threshold, whether the number of times that further judgement is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, do not start fax, in this way, start fax on this port; As current detection to the V21 signal level be more than or equal to the V21 significant level and deduct error threshold, on this port, start fax;
IPPBX detects the CED signal on port, and this port is historical without successfully faxing, and the V21 signal do not detected after the CED signal at this Port detecting as IPPBX, does not start fax; The V21 signal detected again after the CED signal at this Port detecting as IPPBX, whether the number of times that further judgement is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, does not start fax, in this way, starts fax on this port.
2. the anti-interference method that the IP carrying is faxed as claimed in claim 1 is characterized in that, after starting fax, IPPBX is monitored facsimile posting, as faxes successfully, preserves CED signal level and V21 signal level that current detection arrives; As fax failure, directly abandon CED signal level and V21 signal level that current detection arrives.
3. the anti-interference method of IP carrying fax as claimed in claim 2, is characterized in that, when fax successfully, IPPBX by current detection to CED signal level and CED significant level be weighted on average, and by this average weighted result renewal CED significant level; IPPBX by current detection to V21 signal level and V21 significant level be weighted on average, and this average weighted result is upgraded to the V21 significant level.
4. as the anti-interference method of IP carrying fax as described in above-mentioned any one claim, it is characterized in that, the described V21 of being consecutively detected signal number of times is the number of times that the time interval between the signal detected is no more than the V21 signal of time threshold.
5. the anti-interference method that the IP carrying is faxed as claimed in claim 4 is characterized in that described error threshold is 3db, and described count threshold is 3 times, and described time threshold is 8s.
6.IPPBX equipment, is characterized in that, comprises that signal detection module, anti-interference process module, fax start module;
Described signal detection module for detection of the facsimile signal on port, triggers the anti-interference process module after the CED signal being detected;
Described anti-interference process module, while for having at port, successfully faxing history, the CED signal level that the anti-interference process module detects the current demand signal detection module and CED significant level are relatively, as current detection to the CED signal level be less than the CED significant level and deduct error threshold, the anti-interference process module is end process; As current detection to the CED signal level be more than or equal to the CED significant level and deduct error threshold, further judge whether signal detection module detects the V21 signal after the CED signal being detected, and as no, the anti-interference process module is end process; In this way, the V21 signal level again current detection arrived and V21 significant level are relatively, as current detection to the V21 signal level be less than the V21 significant level and deduct error threshold, the anti-interference process module further judges whether the number of times that is consecutively detected the V21 signal at this port is more than or equal to count threshold, as no, do not start fax, in this way, start fax on this port; As current detection to the V21 signal level be more than or equal to the V21 significant level and deduct error threshold, the anti-interference process module triggers fax and starts module;
When successfully fax is historical, the V21 signal do not detected at port at Port detecting when signal detection module after the CED signal, the anti-interference process module is end process; The V21 signal detected again after the CED signal at Port detecting when signal detection module, whether the anti-interference process module number of times that further judgement is consecutively detected the V21 signal at signal detection module is more than or equal to count threshold, as no, the anti-interference process module is end process, in this way, the anti-interference process module triggers fax startup module;
Described fax starts module, for the startup on corresponding port, faxes.
7. IPPBX equipment as claimed in claim 6, is characterized in that described anti-interference process module, also for after triggering fax startup module, the anti-interference process module is monitored facsimile posting, as faxes successfully, preserves CED signal level and V21 signal level that current detection arrives; As fax failure, directly abandon CED signal level and V21 signal level that current detection arrives.
8. IPPBX equipment as claimed in claim 7, it is characterized in that described anti-interference process module is also faxed successfully for working as, the anti-interference process module by current detection to CED signal level and CED significant level be weighted on average, and this average weighted result is upgraded to the CED significant level; The anti-interference process module by current detection to V21 signal level and V21 significant level be weighted on average, and this average weighted result is upgraded to the V21 significant level.
9. as IPPBX equipment as described in claim 6,7 or 8, it is characterized in that, described anti-interference process module judgement is consecutively detected V21 signal number of times, is specially the number of times that the time interval detected between signal is no more than the V21 signal of time threshold.
10. IPPBX equipment as claimed in claim 9, is characterized in that, described error threshold is 3db, and described count threshold is 3 times, and described time threshold is 8s.
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| CN2010105902418A CN102572144B (en) | 2010-12-15 | 2010-12-15 | Anti-interference method for fax over IP (internet protocol) and IPPBX (Internet Protocol Private Branch Exchange) equipment |
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| CN2010105902418A CN102572144B (en) | 2010-12-15 | 2010-12-15 | Anti-interference method for fax over IP (internet protocol) and IPPBX (Internet Protocol Private Branch Exchange) equipment |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0936798A1 (en) * | 1998-02-11 | 1999-08-18 | Sagem Sa | Facsimile with back-up powering of line engagement means |
| CN1340269A (en) * | 1999-02-10 | 2002-03-13 | 高通股份有限公司 | Method and device for detection of fax call |
| CN2591670Y (en) * | 2002-12-10 | 2003-12-10 | 天津光电通信技术有限公司 | Fax comuter interface device |
| CN1466370A (en) * | 2002-06-07 | 2004-01-07 | ���ǵ�����ʽ���� | Self-diagnosis method for facsimile equipment and facsimile equipment for implementing same |
| CN201204616Y (en) * | 2008-01-03 | 2009-03-04 | 刘望舒 | Using telephone voice channel as module of data facsimile communication |
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- 2010-12-15 CN CN2010105902418A patent/CN102572144B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0936798A1 (en) * | 1998-02-11 | 1999-08-18 | Sagem Sa | Facsimile with back-up powering of line engagement means |
| CN1340269A (en) * | 1999-02-10 | 2002-03-13 | 高通股份有限公司 | Method and device for detection of fax call |
| CN1466370A (en) * | 2002-06-07 | 2004-01-07 | ���ǵ�����ʽ���� | Self-diagnosis method for facsimile equipment and facsimile equipment for implementing same |
| CN2591670Y (en) * | 2002-12-10 | 2003-12-10 | 天津光电通信技术有限公司 | Fax comuter interface device |
| CN201204616Y (en) * | 2008-01-03 | 2009-03-04 | 刘望舒 | Using telephone voice channel as module of data facsimile communication |
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