CN102629966B - Method, device and system for high speed fax machines to achieve low speed fax - Google Patents
Method, device and system for high speed fax machines to achieve low speed fax Download PDFInfo
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- CN102629966B CN102629966B CN201210095889.7A CN201210095889A CN102629966B CN 102629966 B CN102629966 B CN 102629966B CN 201210095889 A CN201210095889 A CN 201210095889A CN 102629966 B CN102629966 B CN 102629966B
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Abstract
The embodiment of the invention discloses a method, a device and a system for high speed fax machines to achieve low speed fax, and relates to the communication field. The method, the device and the system which are used for sending faxes solve the problem of poor gateway performances caused by the constant detecting of core memory (CM) signals, and improve gateway performances. The method provided by the embodiment of the invention includes that a receiving-side gateway begins to detect the CM signals while detecting current quality parameters in a preset threshold, wherein the CM signals are sent by a high speed sending fax machine, and transmitted to a high speed receiving fax machine through a sending-side gateway and the receiving-side gateway; the receiving-side gateway detects the CM signals, determines that high speed fax business information exists in the CM signals, and intercepts the CM signals; receives low speed fax signals which are sent by the high speed receiving fax machine when the CM signals are not received by the receiving fax machine in the preset time; and performs low speed fax signal consultation with the sending-side gateway based on the low speed fax signal, and starts low speed fax after the consultation succeeds.
Description
Technical field
The present invention relates to communication field, relate in particular to the method, apparatus and system that high speed facsimile apparatus is realized low speed fax.
Background technology
Gateway (Media Gate Way is called for short MGW), major function is to provide Bearer Control and transfer resource, can be for transmitting data flow between different networks.Data flow mainly refers to the signal that the data equipments such as Common Facsimile Machine, high speed facsimile apparatus, modem send in reciprocal process.The mode of gateway passes data flow mainly contains at present: be applicable to the transparent transmission mode of high-speed facsimile and be applicable to the T.38 mode that low speed is faxed.Transparent transmission mode refers to the code encoding/decoding mode G.711 by ITU-T, using data flow as common voice flow, carrying out harmless encoding and decoding processes, but this mode is subject to IP network influence of fluctuations larger, while there is many packet losses and larger shake in IP network, transmission quality cannot be guaranteed.T.38 mode refers to the agreement T.38 by ITU-T, and the facsimile signal of following ITU-TT.30 agreement that facsimile machine is sent is converted into the mode that the T.38 facsimile message of IP bearer network transmission transmits that is applicable to.The advantage of this mode is because adopted the T.38 message of proper IP bearer network transmission to transmit fax-traffic, more intense to there is the defensive ability/resistance ability of various damages on IP network, has greatly improved success rate and the stability of fax; Shortcoming is to realize more complicated.So, in order to guarantee fax quality, often high-speed facsimile is reduced to the rear transmission of low speed fax.
Prior art is general to be adopted by gateway detection of call menu (Call Menu, be called for short CM) signal, and by the CM signal intercept that contains high-speed facsimile service, make high-speed facsimile reduce to low speed fax, stating in realization high-speed facsimile reduces in the process of method of low speed fax, inventor finds at least to have following defect: gateway carries out CM input always, not only reduce the service feature of gateway, and in the situation that network quality is good, also high-speed facsimile is reduced to the transmission of low speed fax, make facsimile posting complicated.
Summary of the invention
Embodiments of the invention provide a kind of high speed facsimile apparatus to realize the method, apparatus and system of low speed fax, by real-time Sampling network quality requirements, and in network quality condition, just start to detect CM signal when poor, high-speed facsimile is reduced to low speed fax, improved gate performance, realized according to the flexible choice for use high-speed facsimile of network quality or low speed fax.
For achieving the above object, the technical scheme that the embodiment of the present invention adopts is,
On the one hand, the embodiment of the present invention provides a kind of high speed facsimile apparatus to realize the method for low speed fax, it is characterized in that, comprise,
When receiver side gateway detects current network mass parameter in predetermined threshold value time, start detection of call menu CM signal, wherein, described CM signal sends by sending at a high speed facsimile machine, and sends through transmitter side gateway and receiver side gateway the machine of receiving faxes at a high speed to;
At described receiver side gateway, described CM signal detected, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal;
Described receiver side gateway receives the low speed facsimile signal of sending when the described high speed machine of receiving faxes is not received described CM signal in Preset Time;
Described receiver side gateway carries out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, starts low speed fax.
On the one hand, the embodiment of the present invention provides a kind of high speed facsimile apparatus to realize the receiver side gateway of low speed fax, it is characterized in that, comprising:
The first detecting unit, for detection of current network quality;
The second detecting unit, for when described the first detecting unit determines that current network mass parameter is in predetermined threshold value, detection of call menu CM signal also determines in described CM signal whether have high-speed facsimile service information, wherein, described CM signal sends by sending at a high speed facsimile machine, and sends through transmitter side gateway and receiver side gateway the machine of receiving faxes at a high speed to;
Interception unit, for determining that at described the second detecting unit described CM signal exists after high-speed facsimile service information, tackles described CM signal;
Receiving element, for receiving the low speed facsimile signal of sending when the described high speed machine of receiving faxes is not received described CM signal in Preset Time;
Negotiation element for carrying out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and starts low speed fax after consulting successfully.
On the one hand, the embodiment of the present invention provides a kind of high-speed facsimile to realize the network facsimile system of low speed fax, it is characterized in that, comprise, send at a high speed facsimile machine and the machine of receiving faxes at a high speed, send with described high speed the transmitter side gateway that facsimile machine is connected, and the receiver side gateway being connected with the described high speed machine of receiving faxes, wherein
Described high speed sends facsimile machine, for sending call menu CM signal;
Described transmitter side gateway, is sent to described receiver side gateway for the CM signal that described high speed transmission facsimile machine is sent;
Described receiver side gateway, for when current network mass parameter being detected in predetermined threshold value time, start to detect CM signal, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal, receive the low speed facsimile signal of sending when the described high speed machine of receiving faxes is not received described CM signal in Preset Time, and carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, start low speed fax;
The described high speed machine of receiving faxes, for receiving described CM signal, and sends low speed facsimile signal while not receiving described CM signal in Preset Time.
On the one hand, the embodiment of the present invention provides another kind of high speed facsimile apparatus to realize the method for low speed fax, it is characterized in that, comprising:
When transmitter side gateway detects current network mass parameter in predetermined threshold value time, start detection of call menu CM signal, wherein, described CM signal sends by sending at a high speed facsimile machine, and sends through described transmitter side gateway and receiver side gateway the machine of receiving faxes at a high speed to;
At described transmitter side gateway, described CM signal detected, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal, when machine is not received described CM signal in Preset Time so that described high speed is received faxes, send low speed facsimile signal to described receiver side gateway, and then make described receiver side gateway carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, start low speed fax.
On the one hand, the embodiment of the present invention provides a kind of high speed facsimile apparatus to realize the transmitter side gateway of low speed fax, it is characterized in that, comprising:
The first detecting unit, for detection of current network quality;
The second detecting unit, for when described the first detecting unit determines that current network mass parameter is in predetermined threshold value, detect CM signal and determine in described CM signal whether have high-speed facsimile service information, wherein, described CM signal sends by sending at a high speed facsimile machine, and sends through transmitter side gateway and receiver side gateway the machine of receiving faxes at a high speed to;
Interception unit, for determining that at described the second detecting unit described CM signal exists after high-speed facsimile service information, tackle described CM signal, when machine is not received described CM signal in Preset Time so that described high speed is received faxes, send low speed facsimile signal to described receiver side gateway, and then make described receiver side gateway carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, start low speed fax.
On the one hand, the embodiment of the present invention provides another kind of high-speed facsimile to realize the network facsimile system of low speed fax, it is characterized in that, comprise, send at a high speed facsimile machine and the machine of receiving faxes at a high speed, send with described high speed the transmitter side gateway that facsimile machine is connected, and the receiver side gateway being connected with the described high speed machine of receiving faxes, wherein
Described high speed sends facsimile machine, for sending call menu CM signal;
Described transmitter side gateway, for when current network mass parameter being detected in predetermined threshold value time, start to detect CM signal, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal, when machine is not received described CM signal in Preset Time so that described high speed is received faxes, send low speed facsimile signal to described receiver side gateway;
Described receiver side gateway, be used for receiving and when the described high speed machine of receiving faxes is not received described CM signal in Preset Time, send low speed facsimile signal, and carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, start low speed fax;
The described high speed machine of receiving faxes, for receiving described CM signal, and sends low speed facsimile signal while not receiving described CM signal in Preset Time.
The high speed facsimile apparatus that the embodiment of the present invention provides is realized the method, apparatus and system of low speed fax, by real-time Sampling network quality requirements, and when network quality parameters is in predetermined threshold value, just start to detect CM signal, high-speed facsimile is reduced to low speed fax, improved gate performance, realized according to the flexible choice for use high-speed facsimile of network quality or low speed fax.Solve gateway and carried out CM input always, not only reduced the service feature of gateway, and in the situation that network quality is good, also high-speed facsimile has been reduced to the transmission of low speed fax, made the problem of facsimile posting complexity.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of high speed facsimile apparatus that Fig. 1 provides for the embodiment of the present invention is realized the method flow diagram of low speed fax;
The another kind of high speed facsimile apparatus that Fig. 2 provides for the embodiment of the present invention is realized the method flow diagram of low speed fax;
A kind of high speed facsimile apparatus that Fig. 3 provides for the embodiment of the present invention is realized the structure drawing of device of the receiver side gateway of low speed fax;
The another kind of high speed facsimile apparatus that Fig. 4 provides for the embodiment of the present invention is realized the structure drawing of device of the receiver side gateway of low speed fax;
A kind of high speed facsimile apparatus that Fig. 5 provides for the embodiment of the present invention is realized the structure drawing of device of the transmitter side gateway of low speed fax;
A kind of high-speed facsimile that Fig. 6 provides for the embodiment of the present invention is realized the network facsimile system figure of low speed fax.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
In background technology, illustrate, high-speed facsimile implementation method is simple, transmission speed is fast, but require higher to network quality, low speed fax implementation method more complicated, but the success rate of faxing in the situation that network quality is poor is higher, so, high speed facsimile apparatus is realized and is simply faxed fast and guarantee that the method for fax success rate is the mode of high-speed facsimile that adopts in the situation that network quality is good, in the situation that network quality is poor, adopt the mode of low speed fax to fax, first the process of low speed fax and high-speed facsimile is briefly described below.
Adopt the flow process of the low speed fax that T.38 form sends to be generally, send facsimile machine and send caller single-tone (Calling Tone, abbreviation CNG) signal is to initiate fax, the machine of receiving faxes sends low speed facsimile signal, this low speed facsimile signal is specially V.21FLAG signal, V.21FLAG transmission facsimile machine detects and sends response signal after signal, starts afterwards training and sends the fax page.
The basic procedure that high speed facsimile apparatus sends fax is, send at a high speed facsimile machine and send caller single-tone CNG signal to initiate fax, when receiving modulation answering tone (the Answer Amplitude Modulation of the machine feedback of receiving faxes at a high speed, abbreviation ANSam) after signal, send continuously call menu (Call Menu is called for short CM) signal.If receive faxes at a high speed, machine examination sends continuous connection menu signal (Joint Menu is called for short JM) after measuring two complete CM signals, sends at a high speed facsimile machine to entering the process of training and fax after JM signal response.
The embodiment of the present invention is by receiver side gateway or the real-time Sampling network quality of transmitter side gateway, and when network quality parameters is in predetermined threshold value, gateway enters fax intervention states, starts detection and the interception of CM signal, forces high-speed facsimile to reduce to low speed fax.
It should be noted that, transmitter side gateway and receiver side gateway can be processed respectively a plurality of fax events simultaneously, by the unique identification that each fax event is given, distinguish, to each fax event, distribute different physical resources again, transmitter side gateway and receiver side gateway are relatively independent to the processing of each fax event, unaffected between each fax event.The embodiment of the present invention only describes for one of them fax event.
A kind of high speed facsimile apparatus that the embodiment of the present invention provides is realized the method for low speed fax, be applied to fax through internet, as shown in Figure 6, described fax through internet at least comprises high speed and sends facsimile machine 10 and the machine 20 of receiving faxes at a high speed, and send facsimile machine 10, transmitter side gateway 30 and the receiver side gateway 40 that machine 20 is connected of receiving faxes at a high speed with described high speed respectively, wherein, send at a high speed facsimile machine 10 with transmitter side gateway 30, the machine 20 of receiving faxes is connected by PSTN respectively with receiver side gateway 40 at a high speed, transmitter side gateway 30 is connected by IP network with receiver side gateway 40.Referring to Fig. 1, the method comprises:
S101: when receiver side gateway 40 detects current network quality in predetermined threshold value time, start detection of call menu CM signal, wherein, described CM signal sends by sending at a high speed facsimile machine 10, and sends through transmitter side gateway 30 and receiver side gateway 40 machine 20 of receiving faxes at a high speed to;
Before illustrate, both can select 30 pairs of network qualities of transmitter side gateway to detect in real time, and CM signal is detected and tackled, also can be completed by receiver side gateway 40, preferably, 40 pairs of network qualities of the present embodiment selective reception side gateway detect in real time, and CM signal is detected and tackled.
The threshold value of receiver side gateway 40 default network quality parameters, the value of predetermined threshold value can be definite according to the empirical value of industry prior art, and to real-time Sampling network mass parameter, wherein, network quality parameters can comprise bursts dropping ratio, one or more in propagation delay time, shake.Referring to table 1, it is the threshold value of each parameter of the judgement network quality of the present embodiment suggestion.If the threshold value of judgement network quality parameters changes, embodiment can upgrade in time.
Table 1
| Sequence number | Network hierarchy | Propagation delay time (ms) | Bursts dropping ratio | Shake (ms) |
| 1 | Well (suggestion) | ≤40 | ≤0.1％ | ≤10 |
| 2 | Poor | ≤100 | ≤1％ | ≤20 |
| 3 | Badly | ≤400 | ≤5％ | ≤60 |
Referring to table 2, it is the transmission situation under diverse network quality requirements.So network, when good situations, does not need to intervene facsimile negotiation, directly selects the mode of transparent transmission; Network, when poor situation, by intervening, is used T.38 transmission, improves success rate; Network, in severe situation, does not need to intervene, and network is unavailable, generally all can be failed.
Table 2
When receiver side gateway 40 detects current network mass parameter in predetermined threshold value time, be defined as current network quality requirements for poor, receiver side gateway 40 enters fax intervention states, the detection of beginning CM signal.Because it is larger that detection CM signal takies gateway hardware resource, so, with respect to detect CM signal always, selectively carry out the performance that CM input can improve gateway.
Below, CM signal is briefly described.
Exemplary, in the present embodiment, sending at a high speed facsimile machine 10 and receive faxes machine 20 transmission CNG signals to initiate fax to high speed, transmitter side gateway 30 and receiver side gateway 40 detect this CNG signal respectively, and send to the machine 20 of receiving faxes at a high speed; The machine 20 of receiving faxes at a high speed sends high-speed facsimile signal, exemplary, this high-speed facsimile signal can be ANSam signal, receiver side gateway 40 detects after ANSam signal, on the one hand this ANSam signal is pass-through to network, carry out media re-negotiation with transmitter side gateway 30 on the one hand, become G.711 with the coding/decoding negotiation between transmitter side gateway 30; Receiver side gateway 40 detects after ANSam signal, ANSam signal is pass-through to transmitter side gateway 30, transmitter side gateway 30 sends to ANSam signal to send at a high speed facsimile machine 10, send at a high speed after facsimile machine 10 is received ANSam signal and start to send continuously CM signal to network, transmitter side gateway 30 is pass-through to receiver side gateway 40 by CM signal by IP network, wherein, preferably, if transmitter side gateway 30 has the function that detects CM signal, CM signal is pass-through to receiver side gateway 40 after closing its function that detects CM signal; If transmitter side gateway 30 does not have the function that detects CM signal, directly CM signal is pass-through to receiver side gateway 40.
S102: described CM signal detected at described receiver side gateway 40, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal;
Exemplary, V.21 receiver side gateway 40 can be used the mode of (L) to detect and send at a high speed the CM signal that facsimile machine 10 sends, and analyzes in this CM signal whether have high-speed facsimile service information.CM signal is the signal that V.21 (L) modulates, and uses the modulation system of FSK, and its carrier frequency centre frequency is 1080Hz, and bit0 is used the modulation of 1180Hz signal, and bit1 is used 980Hz signal to modulate.Signal content forms according to asynchronous system.Referring to table 3, it is the composition schematic diagram of CM.Field in each square frame is comprised of the asynchronous mode data of 10 BIT.Preamble and synchronization are the synchronous marks of signal, call funtion has comprised the information relevant to fax/MODEM, if BIT content is 0,100 00,001 1 or 01,000 0,101 1 o'clock, be expressed as facsimile service, if BIT content is, represent MODEM business at 0 1,000 0,011 1 o'clock.
Table 3
Receiver side gateway 40 is in broadband side, and IP network side detects CM signal, and the content of callfuntion field is while being facsimile service, and interception CM signal, if MODEM business does not process.Preferably, in order further to optimize the performance of receiver side gateway, receiver side gateway 40 is after CM signal, in this facsimile posting, if non-CM signal detected, illustrate that this fax event has not had CM signal, facsimile posting enters next stage, so stop detecting this fax event high speed, sends the CM signal that facsimile machine 10 sends.Certainly, the present embodiment does not limit specifically stopping CM input.Just as a kind of optimal way, be illustrated.
Receiver side gateway 40 is after broadband side interception CM signal, from the moment of interception, no longer the content of CM signal is sent to the machine 20 of receiving faxes at a high speed, so, the machine 20 of receiving faxes at a high speed can not receive CM signal, or can not receive intactly CM signal, after transmission ANSam signal is overtime, start to send V.21FLAG signal, then send digital identification signal.
S103: described receiver side gateway 40 receives the low speed facsimile signal of sending when the described high speed machine of receiving faxes is not received described CM signal in Preset Time;
Exemplary, the low speed facsimile signal of receiving faxes and sending when machine 20 is not received described CM signal in Preset Time at a high speed, for example, Preset Time can be set as sending 2-3 second after ANSam signal, low speed facsimile signal can be signal V.21FLAG, and receiver side gateway 40 can detect whether there is the V.21FLAG signal of form by the mode of (H) V.21.
S104: described receiver side gateway 40 carries out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway 30, and after consulting successfully, start low speed fax flow process.
The mode that receiver side gateway 40 is held consultation generally need to be configured in advance, for example can configure selection form T.38 or mode G.711, if receiver side gateway 40 detects low speed facsimile signal, signal V.21FLAG for example, but the preferred negotiation mode of configuration is mode G.711, can not carry out low speed facsimile negotiation, and then can not successfully send fax when network quality is poor.So receiver side gateway 40 is under fax intervention states,, there is V.21FLAG signal if definite in the configuration item conductively-closed of receiver side gateway 40, directly selects T.38 form to hold consultation, and improves the success rate of fax.
The process of concrete negotiation comprises:
Receiver side gateway 40 sends low speed fax SIP to transmitter side gateway 30 and consults request, this SIP consults request can be in the SIP re-invite at receiver side gateway 40 (fax request) message, the description that adds low speed facsimile signal, add T.38, send to transmitter side gateway 30, wait for its response.
Transmitter side gateway 30 is received above-mentioned request, carries out low speed fax SIP and consults request processing, replys low speed fax SIP and consults success message.When replying low speed fax SIP to consult success message or start afterwards the flow process of T.38 faxing.
Receiver side gateway 40 is receiving that above-mentioned low speed fax SIP consults after successful message, starts T.38 fax.
The high speed facsimile apparatus that the embodiment of the present invention provides is realized the method for low speed fax, by real-time Sampling network quality requirements, and when network quality parameters is in predetermined threshold value, just start to detect CM signal, high-speed facsimile is reduced to low speed fax, improved gate performance, realized according to the flexible choice for use high-speed facsimile of network quality or low speed fax.Solve gateway and carried out CM input always, not only reduced the service feature of gateway, and in the situation that network quality is good, also high-speed facsimile has been reduced to the transmission of low speed fax, made the problem of facsimile posting complexity.
The another kind of high speed facsimile apparatus that the invention process provides is realized the method for low speed fax, also be applied to the network facsimile system figure shown in Fig. 6, the square ratio juris of embodiment is identical with above-described embodiment method, different is to utilize the real-time Sampling network quality of transmitter side gateway 30, and in network quality parameters, starting CM input during in predetermined threshold value, the present embodiment only describes different places.Referring to Fig. 2, the method comprises,
S201: when transmitter side gateway 50 detects current network mass parameter in predetermined threshold value time, start detection of call menu CM signal, wherein, described CM signal sends by sending at a high speed facsimile machine 10, and sends to through transmitter side gateway 30 and receiver side gateway 40 machine 20 of receiving faxes at a high speed;
The same previous embodiment of the detection method of network quality and determination methods and object, sends at a high speed also same previous embodiment of process that facsimile machine sends CM signal, so locate to repeat no more.Difference is, CM signal is directly sent to transmitter side gateway 30 after sending facsimile machine at a high speed and sending, and 30 pairs of CM signals of transmitter side gateway detect, and no longer CM signal are pass-through to receiver side gateway 40.
S202: described CM signal detected at described transmitter side gateway, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal; When machine is not received described CM signal in Preset Time so that described high speed is received faxes, send low speed facsimile signal to described receiver side gateway 40, and then make described receiver side gateway carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway 30, and after consulting successfully, start low speed fax.
Transmitter side gateway 30 detects described CM signal and judges the same previous embodiment of method that has or not high-speed facsimile service, transmitter side gateway 30 is by after CM signal intercept, the machine 20 of receiving faxes at a high speed can not receive equally CM signal or can not receive complete CM signal, so, the machine 20 of receiving faxes at a high speed sends low speed facsimile signal, be specially V.21FLAG signal, to receiver side gateway 40, in like manner, the mode that receiver side gateway 40 is held consultation generally need to be configured in advance, for example can configure selection form T.38 or mode G.711, if receiver side gateway 40 detects low speed facsimile signal, signal V.21FLAG for example, but the preferred negotiation mode of configuration is mode G.711, can not carry out low speed facsimile negotiation, and then can not successfully send fax when network quality is poor.So exemplary, receiver side gateway 40 is under fax intervention states,, there is V.21FLAG signal if definite in the configuration item conductively-closed of receiver side gateway 40, directly selects T.38 form to hold consultation, and after consulting successfully, start low speed fax flow process, improve the success rate of fax.Concrete negotiations process is identical with previous embodiment, so locate to repeat no more.Exemplary, the mode that receiver side gateway 40 enters fax intervention states has: by the real-time Sampling network quality of transmitter side gateway 30, and when network quality parameters is in predetermined threshold value, notify receiver side gateway 40, so that receiver side gateway 40 enters fax intervention states, or by the real-time Sampling network quality of receiver side gateway 40, and when network quality parameters is in predetermined threshold value, enter fax intervention states.
The high speed facsimile apparatus that the embodiment of the present invention provides is realized the method for low speed fax, by real-time Sampling network quality requirements, and when network quality parameters is in predetermined threshold value, just start to detect CM signal, high-speed facsimile is reduced to low speed fax, improved gate performance, realized according to the flexible choice for use high-speed facsimile of network quality or low speed fax.Solve gateway and carried out CM input always, not only reduced the service feature of gateway, and in the situation that network quality is good, also high-speed facsimile has been reduced to the transmission of low speed fax, made the problem of facsimile posting complexity.
On the one hand, the embodiment of the present invention provides a kind of high speed facsimile apparatus to realize the receiver side gateway 40 of low speed fax, is applied to the method shown in Fig. 1, and referring to Fig. 3, this receiver side gateway 40 comprises,
The first detecting unit 401, for detection of current network quality;
Exemplary, the threshold value of receiver side gateway 40 default network quality parameters, the value of predetermined threshold value can be determined according to the empirical value of industry prior art, and to real-time Sampling network mass parameter, wherein, network quality parameters can comprise bursts dropping ratio, one or more in propagation delay time, shake.Referring to table 1, it is the threshold value of each parameter of the judgement network quality of the present embodiment suggestion.If the parameter threshold of judgement network quality changes, embodiment can upgrade in time.
The second detecting unit 402, for when described the first detecting unit determines that current network mass parameter is in predetermined threshold value, detect CM signal and determine in described CM signal whether have high-speed facsimile service information, wherein, described CM signal sends out by sending at a high speed facsimile machine, and sends through transmitter side gateway and receiver side gateway the machine of receiving faxes at a high speed to;
Exemplary, V.21 receiver side gateway 40 can be used the mode of (L) to detect and send at a high speed the CM signal that facsimile machine sends, and analyzes in this CM signal whether have high-speed facsimile service information.CM signal is the signal that V.21 (L) modulates, and uses the modulation system of F SK, and its carrier frequency centre frequency is 1080Hz, and bit0 is used the modulation of 1180Hz signal, and bit1 is used 980Hz signal to modulate.Signal content forms according to asynchronous system.Referring to table 3, it is the composition schematic diagram of CM.Field in each square frame is comprised of the asynchronous mode data of 10 BIT.Preamble and synchronization are the synchronous marks of signal, call funtion has comprised the information relevant to fax/MODEM, if BIT content is 01,000 0,001 1 or 010,000,101 1 o'clock, be expressed as facsimile service, if BIT content is, represent MODEM business at 0 1,000 0,011 1 o'clock.
Receiver side gateway 40 is in broadband side, and IP network side detects CM signal, and the content of callfuntion field is while being facsimile service, and interception CM signal, if MODEM business does not process.Preferably, in order further to optimize the performance of receiver side gateway, receiver side gateway 40 arrives after non-CM signal in CM input, illustrates and there is no CM signal, and facsimile posting enters next stage, so close CM signal testing function, no longer detects CM signal.Certainly, the present embodiment does not limit specifically closing CM signal testing function.Just as a kind of optimal way, be illustrated.
Interception unit 403, for determining that at described the second detecting unit described CM signal exists after high-speed facsimile service information, tackles described CM signal;
Exemplary, receiver side gateway 40 is after broadband side interception CM signal, from the moment of interception, no longer the content of CM signal is sent to the machine of receiving faxes at a high speed, so, the machine of receiving faxes can not receive CM signal at a high speed, or can not receive intactly CM signal, after transmission ANSam signal is overtime, start to send V.21FLAG, then send digital identification signal.
Receiving element 404, for receiving the low speed facsimile signal of sending when the machine of receiving faxes is not received described CM signal in Preset Time at a high speed;
Exemplary, to send when the machine of receiving faxes is not received described CM signal in Preset Time at a high speed low speed facsimile signal, for example, Preset Time can be set as sending 2-3 second after ANSam signal, and low speed facsimile signal can be signal V.21FLAG.Receiver side gateway 40 can detect whether there is the V.21FLAG signal of form by the mode of (H) V.21.
Negotiation element 405 for carrying out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and starts low speed fax after consulting successfully.
Further, referring to Fig. 4, described negotiation element 405 comprises,
Sending module 4051, becomes negotiation request T.38 for sending coding/decoding negotiation to described transmitter side gateway;
T.38 receiver module 4052, become successfully information for receiving the coding/decoding negotiation being sent by described transmitter side gateway.
Described the second detecting unit 402 also in described interception unit by after described CM signal intercept, and after non-CM signal being detected, stop detecting described CM signal.
Described receiver side gateway 40 also comprises storage element 406, be used for storing described network quality parameters, described network quality parameters comprises bursts dropping ratio, one or more in propagation delay time, shake, the value of the predetermined threshold value of described network parameter can be determined according to the empirical value of industry prior art, referring to table 1, can be:
Bursts dropping ratio is greater than 0.1% and be less than or equal to 1.0%;
Individual event time delay is greater than 40ms and is less than or equal to 100ms;
Shake is greater than 10ms and is less than or equal to 20ms.
If the parameter threshold of judgement network quality changes, embodiment can upgrade in time.
The high speed facsimile apparatus that the embodiment of the present invention provides is realized the receiver side gateway of low speed fax, by real-time Sampling network quality requirements, and when network quality parameters is in predetermined threshold value, just start to detect CM signal, high-speed facsimile is reduced to low speed fax, improved gate performance, realized according to the flexible choice for use high-speed facsimile of network quality or low speed fax.Solve gateway and carried out CM input always, not only reduced the service feature of gateway, and in the situation that network quality is good, also high-speed facsimile has been reduced to the transmission of low speed fax, made the problem of facsimile posting complexity.
On the one hand, the embodiment of the present invention provides a kind of high speed facsimile apparatus to realize the transmitter side gateway 30 of low speed fax, is applied to the method shown in Fig. 2, and referring to Fig. 5, this transmitter side gateway 30 comprises,
The first detecting unit 301, for detection of current network quality;
Exemplary, network quality parameters can comprise bursts dropping ratio, one or more in propagation delay time, shake, same above-described embodiment of method of Sampling network quality.
The second detecting unit 302, for when described the first detecting unit determines that current network mass parameter is in predetermined threshold value, detect CM signal and determine in described CM signal whether have high-speed facsimile service information, wherein, described CM signal sends out by sending at a high speed facsimile machine, and sends through transmitter side gateway 30 and receiver side gateway the machine of receiving faxes at a high speed to;
Interception unit 303, for determining that at described the second detecting unit described CM signal exists after high-speed facsimile service information, tackle described CM signal, when machine is not received described CM signal in Preset Time so that described high speed is received faxes, send low speed facsimile signal to described receiver side gateway, and then make described receiver side gateway according to described low speed facsimile signal, carry out the negotiation of low speed facsimile signal with described transmitter side gateway, and after consulting successfully, start low speed fax flow process.
Further, described the second detecting unit 302 also in described interception unit 303 by after described CM signal intercept, and after non-CM signal being detected, stop detecting described CM signal.
The high speed facsimile apparatus that the embodiment of the present invention provides is realized the transmitter side gateway 30 of low speed fax, by real-time Sampling network quality requirements, and when network quality parameters is in predetermined threshold value, just start to detect CM signal, high-speed facsimile is reduced to low speed fax, improved gate performance, realized according to the flexible choice for use high-speed facsimile of network quality or low speed fax.Solve gateway and carried out CM input always, not only reduced the service feature of gateway, and in the situation that network quality is good, also high-speed facsimile has been reduced to the transmission of low speed fax, made the problem of facsimile posting complexity.
On the one hand, the embodiment of the present invention also provides a kind of high-speed facsimile to realize the network facsimile system of low speed fax, is applied to the method shown in Fig. 1, referring to Fig. 6, comprise,
Send at a high speed facsimile machine 10 and the machine 20 of receiving faxes at a high speed, and send facsimile machine 10, transmitter side gateway 30 and the receiver side gateway 40 that machine 20 is connected of receiving faxes at a high speed with described high speed respectively, wherein,
Described high speed sends facsimile machine 10, for sending call menu CM signal;
Described transmitter side gateway 30, is sent to described receiver side gateway 40 for the CM signal that described high speed transmission facsimile machine 10 is sent;
Described receiver side gateway 40, for when current network parameter being detected in predetermined threshold value time, start to detect CM signal, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal, receive the low speed facsimile signal that described high speed is received faxes and sent when machine 20 is not received described CM signal in Preset Time, and carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway 30, and after consulting successfully, start low speed fax;
The described high speed machine 20 of receiving faxes, for receiving described CM signal, and sends low speed facsimile signal while not receiving described CM signal in Preset Time.
The high speed facsimile apparatus that the embodiment of the present invention provides is realized the system of low speed fax, by real-time Sampling network quality requirements, and when network quality parameters is in predetermined threshold value, just start to detect CM signal, high-speed facsimile is reduced to low speed fax, improved gate performance, realized according to the flexible choice for use high-speed facsimile of network quality or low speed fax.Solve gateway and carried out CM input always, not only reduced the service feature of gateway, and in the situation that network quality is good, also high-speed facsimile has been reduced to the transmission of low speed fax, made the problem of facsimile posting complexity.
On the one hand, the embodiment of the present invention also provides another kind of high-speed facsimile to realize the network facsimile system of low speed fax, is applied to the method shown in Fig. 2, referring to Fig. 6, comprise,
Send at a high speed facsimile machine 10 and the machine 20 of receiving faxes at a high speed, and send facsimile machine 10, transmitter side gateway 30 and the receiver side gateway 40 that machine 20 is connected of receiving faxes at a high speed with described high speed respectively, wherein,
Described high speed sends facsimile machine 10, for sending call menu CM signal;
Described transmitter side gateway 30, for when current network mass parameter being detected in predetermined threshold value time, start to detect CM signal, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal, when machine 20 is not received described CM signal in Preset Time so that described high speed is received faxes, send low speed facsimile signal to described receiver side gateway 40;
Described receiver side gateway 40, be used for receiving receiving faxes at a high speed and when machine 20 is not received described CM signal in Preset Time, send low speed facsimile signal, and carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway 30, and after consulting successfully, start low speed fax;
The described high speed machine 20 of receiving faxes, for receiving described CM signal, and sends low speed facsimile signal while not receiving described CM signal in Preset Time.
The high speed facsimile apparatus that the embodiment of the present invention provides is realized the system of low speed fax, by real-time Sampling network quality requirements, and when network quality parameters is in predetermined threshold value, just start to detect CM signal, high-speed facsimile is reduced to low speed fax, improved gate performance, realized according to the flexible choice for use high-speed facsimile of network quality or low speed fax.Solve gateway and carried out CM input always, not only reduced the service feature of gateway, and in the situation that network quality is good, also high-speed facsimile has been reduced to the transmission of low speed fax, made the problem of facsimile posting complexity.
One of ordinary skill in the art will appreciate that all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (15)
1. high speed facsimile apparatus is realized a method for low speed fax, it is characterized in that, comprising:
Receiver side gateway receives caller single-tone CNG signal, and wherein, described CNG signal is by sending at a high speed that facsimile machine sends and transmitting through transmitter side gateway;
Described receiver side gateway sends described CNG signal to the high speed machine of receiving faxes;
Described receiver side gateway receives the described high speed machine of receiving faxes and is receiving the high-speed facsimile signal sending after described CNG signal;
Described receiver side gateway sends facsimile machine through described transmitter side gateway to described high speed and sends described high-speed facsimile signal, so that described high speed sends facsimile machine, sends CM signal;
Described receiver side gateway detects current network mass parameter in real time;
At described receiver side gateway, through described transmitter side gateway, to described high speed, send after facsimile machine sends described high-speed facsimile signal, described method also comprises:
When described receiver side gateway detects current network mass parameter not in predetermined threshold value time, do not start facsimile negotiation intervention, adopt high-speed facsimile mode to fax; When described receiver side gateway detects current network mass parameter in predetermined threshold value time, start facsimile negotiation intervention, high-speed facsimile is reduced to low speed fax, wherein, the described step that high-speed facsimile is reduced to low speed fax comprises:
Start detection of call menu CM signal, wherein, described CM signal sends facsimile machine by described high speed and sends, and sends the described high speed machine of receiving faxes to through described transmitter side gateway and described receiver side gateway;
At described receiver side gateway, described CM signal detected, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal;
Described receiver side gateway receives the low speed facsimile signal of sending when the described high speed machine of receiving faxes is not received described CM signal in Preset Time;
Described receiver side gateway carries out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, starts low speed fax.
2. high speed facsimile apparatus according to claim 1 is realized the method for low speed fax, it is characterized in that, the process that described receiver side gateway carries out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway comprises,
Described receiver side gateway sends coding/decoding negotiation to described transmitter side gateway and becomes negotiation request T.38;
Described receiver side gateway receives the coding/decoding negotiation being sent by described transmitter side gateway and becomes T.38 successfully information.
3. high speed facsimile apparatus according to claim 1 and 2 is realized the method for low speed fax, it is characterized in that, at described receiver side gateway by after described CM signal intercept, also comprise, described receiver side gateway ends the data packing of described CM signal to send to the described high speed machine of receiving faxes, and after non-CM signal being detected, stops detecting described high speed and send the CM signal that facsimile machine sends.
4. high speed facsimile apparatus according to claim 3 is realized the method for low speed fax, it is characterized in that, described network quality parameters comprises bursts dropping ratio, one or more in propagation delay time, shake.
5. high speed facsimile apparatus is realized a method for low speed fax, it is characterized in that, comprising:
Transmitter side gateway sends CNG signal to receiver side gateway, so that described receiver side gateway sends described CNG signal to the high speed machine of receiving faxes, wherein, described CNG signal sends to described transmitter side gateway by sending at a high speed facsimile machine;
Described transmitter side gateway receives the high-speed facsimile signal that described receiver side gateway sends, and wherein, described high-speed facsimile signal is sent to described receiver side gateway by the described high speed machine of receiving faxes;
Described transmitter side gateway sends facsimile machine to described high speed and sends described high-speed facsimile signal, so that described high speed sends facsimile machine, sends CM signal;
Described transmitter side gateway detects current network mass parameter in real time;
At described transmitter side gateway, after described high speed transmission facsimile machine sends described high-speed facsimile signal, described method also comprises:
When described transmitter side gateway detects current network mass parameter not in predetermined threshold value time, do not start facsimile negotiation intervention, adopt high-speed facsimile mode to fax; When described transmitter side gateway detects current network mass parameter in predetermined threshold value time, start facsimile negotiation intervention, high-speed facsimile is reduced to low speed fax, wherein, the described step that high-speed facsimile is reduced to low speed fax comprises:
Start detection of call menu CM signal, wherein, described CM signal sends by sending at a high speed facsimile machine, and sends through described transmitter side gateway and receiver side gateway the machine of receiving faxes at a high speed to;
At described transmitter side gateway, described CM signal detected, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal, when machine is not received described CM signal in Preset Time so that described high speed is received faxes, send low speed facsimile signal to described receiver side gateway, and then make described receiver side gateway carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, start low speed fax.
6. high speed facsimile apparatus according to claim 5 is realized the method for low speed fax, it is characterized in that, at described transmitter side gateway by after described CM signal intercept, also comprise, described transmitter side gateway ends the data packing of described CM signal to send to the described high speed machine of receiving faxes, and after non-CM signal being detected, stops detecting described high speed and send the CM signal that facsimile machine sends.
7. according to the high speed facsimile apparatus described in claim 5 or 6, realize the method for low speed fax, it is characterized in that, described network quality parameters comprises bursts dropping ratio, one or more in propagation delay time, shake.
8. high speed facsimile apparatus is realized a receiver side gateway for low speed fax, it is characterized in that, comprising:
The first receiving element, for receiving caller single-tone CNG signal, wherein, described CNG signal is by sending at a high speed that facsimile machine sends and transmitting through transmitter side gateway;
The first transmitting element, for sending described CNG signal to the high speed machine of receiving faxes;
The second receiving element, is receiving for receiving the described high speed machine of receiving faxes the high-speed facsimile signal sending after described CNG signal;
The second transmitting element, sends described high-speed facsimile signal for sending facsimile machine through described transmitter side gateway to described high speed, so that described high speed sends facsimile machine, sends CM signal;
The first detecting unit, for detecting in real time current network quality, when current network mass parameter being detected not in predetermined threshold value time, does not start facsimile negotiation intervention, makes described receiver side gateway adopt high-speed facsimile mode to fax; When current network mass parameter being detected in predetermined threshold value time, start facsimile negotiation intervention;
The second detecting unit, for sending to described high speed through described transmitter side gateway at described the second transmitting element after facsimile machine sends described high-speed facsimile signal, when described the first detecting unit determines that starting facsimile negotiation intervenes, detection of call menu CM signal also determines in described CM signal whether have high-speed facsimile service information, wherein, described CM signal sends facsimile machine by described high speed and sends, and sends through described transmitter side gateway and described receiver side gateway the machine of receiving faxes at a high speed to;
Interception unit, for determining that at described the second detecting unit described CM signal exists after high-speed facsimile service information, tackles described CM signal;
Receiving element, for receiving the low speed facsimile signal of sending when the described high speed machine of receiving faxes is not received described CM signal in Preset Time;
Negotiation element for carrying out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and starts low speed fax after consulting successfully.
9. high speed facsimile apparatus according to claim 8 is realized the receiver side gateway of low speed fax, it is characterized in that, described negotiation element comprises,
Sending module, becomes negotiation request T.38 for sending coding/decoding negotiation to described transmitter side gateway;
T.38 receiver module, become successfully information for receiving the coding/decoding negotiation being sent by described transmitter side gateway.
10. high speed facsimile apparatus is according to claim 8 or claim 9 realized the receiver side gateway of low speed fax, it is characterized in that, described the second detecting unit also in described interception unit by after described CM signal intercept, and after non-CM signal being detected, stop detecting described high speed and send the CM signal that facsimile machine sends.
11. high speed facsimile apparatus according to claim 10 are realized the receiver side gateway of low speed fax, it is characterized in that, also comprise storage element, for storing described network quality parameters, described network quality parameters comprises bursts dropping ratio, one or more in propagation delay time, shake.
12. 1 kinds of high speed facsimile apparatus are realized the transmitter side gateway of low speed fax, it is characterized in that, comprising:
The first transmitting element, for sending CNG signal to receiver side gateway, so that described receiver side gateway sends described CNG signal to the high speed machine of receiving faxes, wherein, described CNG signal sends to described transmitter side gateway by sending at a high speed facsimile machine;
The first receiving element, the high-speed facsimile signal sending for receiving described receiver side gateway, wherein, described high-speed facsimile signal is sent to described receiver side gateway by the described high speed machine of receiving faxes;
The second transmitting element, sends described high-speed facsimile signal for sending facsimile machine to described high speed, so that described high speed sends facsimile machine, sends CM signal;
The first detecting unit, for detecting in real time current network quality, when current network mass parameter being detected not in predetermined threshold value time, does not start facsimile negotiation intervention, makes described transmitter side gateway adopt high-speed facsimile mode to fax; When current network mass parameter being detected in predetermined threshold value time, start facsimile negotiation intervention;
The second detecting unit, be used at described the second transmitting element after described high speed transmission facsimile machine sends described high-speed facsimile signal, when described the first detecting unit determines that starting facsimile negotiation intervenes, detection of call menu CM signal also determines in described CM signal whether have high-speed facsimile service information, wherein, described CM signal sends by sending at a high speed facsimile machine, and sends through transmitter side gateway and receiver side gateway the machine of receiving faxes at a high speed to;
Interception unit, for determining that at described the second detecting unit described CM signal exists after high-speed facsimile service information, tackle described CM signal, when machine is not received described CM signal in Preset Time so that described high speed is received faxes, send low speed facsimile signal to described receiver side gateway, and then make described receiver side gateway carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, start low speed fax.
13. high speed facsimile apparatus according to claim 12 are realized the transmitter side gateway of low speed fax, it is characterized in that, described the second detecting unit also for, in described interception unit, by after described CM signal intercept, and detect and stop detecting described high speed after non-CM signal and send the CM signal that facsimile machine sends.
14. 1 kinds of high-speed facsimiles are realized the network facsimile system of low speed fax, it is characterized in that, comprise, send at a high speed facsimile machine and the machine of receiving faxes at a high speed, send with described high speed the transmitter side gateway that facsimile machine is connected, and the receiver side gateway being connected with the described high speed machine of receiving faxes, wherein
Described high speed sends facsimile machine, for sending CNG signal to described transmitter side gateway;
Described transmitter side gateway warp, for sending CNG signal to described receiver side gateway;
Described receiver side gateway, for sending described CNG signal to the described high speed machine of receiving faxes;
The described high speed machine of receiving faxes, for sending high-speed facsimile signal to described receiver side gateway;
Described receiver side gateway, for sending described high-speed facsimile signal to described transmitter side gateway;
Described transmitter side gateway, sends described high-speed facsimile signal for sending facsimile machine to described high speed;
Described high speed sends facsimile machine, for sending call menu CM signal;
Described transmitter side gateway, is sent to described receiver side gateway for the CM signal that described high speed transmission facsimile machine is sent;
Described receiver side gateway, for detecting in real time current network mass parameter, when current network mass parameter being detected not in predetermined threshold value time, does not start facsimile negotiation intervention, adopts high-speed facsimile mode to fax, when current network mass parameter being detected in predetermined threshold value time, start facsimile negotiation intervention, high-speed facsimile is reduced to low speed fax, wherein, the described step that high-speed facsimile is reduced to low speed fax comprises: start to detect CM signal, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal, receive the low speed facsimile signal of sending when the described high speed machine of receiving faxes is not received described CM signal in Preset Time, and carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and startup low speed is faxed after consulting successfully,
The described high speed machine of receiving faxes, for receiving described CM signal, and sends low speed facsimile signal while not receiving described CM signal in Preset Time.
15. 1 kinds of high-speed facsimiles are realized the network facsimile system of low speed fax, it is characterized in that, comprise, send at a high speed facsimile machine and the machine of receiving faxes at a high speed, send with described high speed the transmitter side gateway that facsimile machine is connected, and the receiver side gateway being connected with the described high speed machine of receiving faxes, wherein
Described high speed sends facsimile machine, for sending CNG signal to described transmitter side gateway;
Described transmitter side gateway warp, for sending CNG signal to described receiver side gateway;
Described receiver side gateway, for sending described CNG signal to the described high speed machine of receiving faxes;
The described high speed machine of receiving faxes, for sending high-speed facsimile signal to described receiver side gateway;
Described receiver side gateway, for sending described high-speed facsimile signal to described transmitter side gateway;
Described transmitter side gateway, sends described high-speed facsimile signal for sending facsimile machine to described high speed;
Described high speed sends facsimile machine, for sending call menu CM signal;
Described transmitter side gateway, for detecting in real time current network mass parameter, when current network mass parameter being detected not in predetermined threshold value time, does not start facsimile negotiation intervention, adopts high-speed facsimile mode to fax; When current network mass parameter being detected in predetermined threshold value time, start facsimile negotiation intervention, high-speed facsimile is reduced to low speed fax, wherein, the described step that high-speed facsimile is reduced to low speed fax comprises: when current network mass parameter being detected in predetermined threshold value time, start to detect CM signal, and exist after high-speed facsimile service information in definite described CM signal, tackle described CM signal, when machine is received described CM signal in Preset Time so that described high speed is received faxes, do not send low speed facsimile signal to receiver side gateway;
Described receiver side gateway, be used for receiving and when the described high speed machine of receiving faxes is not received described CM signal in Preset Time, send low speed facsimile signal, and carry out the negotiation of low speed facsimile signal according to described low speed facsimile signal and described transmitter side gateway, and after consulting successfully, start low speed fax;
The described high speed machine of receiving faxes, for receiving described CM signal, and sends low speed facsimile signal while not receiving described CM signal in Preset Time.
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| CN1731817A (en) * | 2004-08-06 | 2006-02-08 | 华为技术有限公司 | Realization method for media stream conversion channel working mode switching on gateway |
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