CN100525355C - Self-adaptive in-band and out-of-band number-receiving method for dual-tone multifrequency digital signal - Google Patents
Self-adaptive in-band and out-of-band number-receiving method for dual-tone multifrequency digital signal Download PDFInfo
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- CN100525355C CN100525355C CNB2005100340606A CN200510034060A CN100525355C CN 100525355 C CN100525355 C CN 100525355C CN B2005100340606 A CNB2005100340606 A CN B2005100340606A CN 200510034060 A CN200510034060 A CN 200510034060A CN 100525355 C CN100525355 C CN 100525355C
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Abstract
The adaptive number-receive method both in and out the DTMF digital signal band comprises: starting up both in DTMF band and out the DTMF band based on RFC 2833, and monitoring business data in and out of band; deciding the first one received whether it bases on RFC 2833 or not; once determining the terminal way, closing monitor for another signal till receiving enough number to end the process.
Description
Technical field
The present invention relates to a kind of network technology of related voice message transmission, relating in particular to is that DTMF is the self adaptation number-receiving method that band is interior and band is outer of dual-tone multifrequency digital signal (hereinafter to be referred as DTMF).
Background technology
Along with the continuous maturation of popularizing of using of Internet and technology, make traditional voice messaging be carried on Internet and go up transmission and become possibility that therefore, every technology of VOIP is also just arisen at the historic moment.DTMF (dual-tone multifrequency digital signal), other circuit and main signal, common multifrequency telephone sound, these signal tones transmit on IP-based network can adopt dual mode.
A kind of is to adopt G.711A or G.711u wait signal tones such as higher bit rate coding transmission DTMF, receiving terminal in data has digital signal processor and corresponding algorithm as in gateway, the terminal system, signal tones such as reduction DTMF are to realize the transmission of signal tone.Can understand like this, the transmission of signal tone and speech business data send together, belong to inband signaling.
Another kind is based on RFC 2833, transmits Dual Tone Multifrequency signal, other telephone signal tone and telephone event through coding in the RTP packet.For example: if transmit dtmf signal " 1 ", according to RFC 2833, " event " field at the RTP message of stipulating is filled in numeral " 1 ", in other fields of RTP message, fill in simultaneously relevant information such as time-delay, pitch, then the RTP message is sent to the receiving terminal of data, realized the transmission of signal tone.With the different place of the send mode of preceding a kind of signal tone be, transmission based on the signal tone of RFC 2833, the RTP message of signal tone such as carrying DTMF etc. can make a distinction by the RTP message of RTP message load type (PT) field and voice-bearer, and the transmission of preceding a kind of signal tone be load type (PT) field with the RTP message of voice-bearer is the same.For the ease of understanding, the dtmf signal based on RFC 2833 can be called out of band signal.Out of band signal is not only the digital signal based on the DTMF of RFC 2833, can also be the signal by some privately owned protocol transmission, but this mode can cause the difficulty of devices from different manufacturers butt joint, and this situation is not discussed scope at this paper.
For the load mode of in-band tone, general VOIP equipment all can support, but also existing problems, because gateway, terminal system etc. need detect speech constantly when the received signal sound, judged whether signal tone, increased work load.Such as G.723.1 waiting low bit rate codec,, understand signal tones such as mislead DTMF simultaneously owing to be lossy coding.And do not have above-mentioned shortcoming based on the out of band signal load mode of RFC 2833, and also support the transmission of scrambled digital signal simultaneously, avoided potential safety hazard by transmission of digital signals in the band.But in the interior equipment of net, the equipment that has is only supported the out of band signal load mode based on RFC 2833 at present, and the only support inband signaling load mode that has is all supported for two kinds that have.So just cause the coexistence of the load mode of two kinds of signal tones.
The gateway of prior art, the general default support DTMF of terminal system adopt the number receiving mode of in-band method, if gateway, terminal system need be supported the number receiving mode of DTMF based on the out of band signal of RFC 2833, need carry out capability negotiation by control protocol MGCP/SIP/H.248 etc., determine whether to support RFC 2833.Gateway, terminal system confirm that at the link establishment initial stage number receiving mode is outside the band or after in the band, generally just can not change.
The DTMF number receiving mode of prior art can only adopt and collect the digits in the band that consults in advance or be with outer a kind of in collecting the digits.Revise the DTMF number receiving mode if desired, possibility is only supported wherein a kind of owing to gateway, terminal system are limited to DTMF number receiving mode ability; Perhaps be revised as number receiving mode in the band, so all can cause consulting the failure of DTMF number receiving mode by the outer number receiving mode of DTMF band.Even the DTMF number receiving mode is consulted successfully, gateway, terminal system that also might the source end still adopts the DTMF number send mode before consulting, and causes the failure that collects the digits of gateway, the terminal system of destination.Simultaneously, for the situation that needs are supported two kinds of number receiving modes simultaneously, promptly simultaneously by carrying out the situation that number reports with interior with band is outer, prior art is not supported.
Summary of the invention
The objective of the invention is to propose in a kind of dual-tone multifrequency digital signal band and the outer self adaptation number-receiving method of band, can detect dtmf signal is to adopt the inband signaling load mode, still adopt based on RFC2833 out of band signal load mode, thereby realize the DTMF function that collects the digits of self adaptation inside and outside band, application demand according to reality is obtained number, and can realize with the interior and outer situation about collecting the digits simultaneously of band, can support the occasion of more applications, improve the adaptability of gateway, terminal system.
Technical scheme of the present invention is as follows:
With the outer self adaptation number-receiving method of band, it may further comprise the steps in a kind of dual-tone multifrequency digital signal band:
A) start when collecting the digits, will collect the digits in the DTMF band and start simultaneously, in the monitoring band and the outer professional data of band based on the outer functional module that collects the digits of DTMF band of RFC 2833;
B) the DTMF number of receiving is judged that the interior number of band also is based on the band External Number of RFC 2833;
C) after the number mode, the monitoring function that collects the digits of another kind of signal tone is closed in confirming to produce the terminal employing band External Number of dtmf signal sound or being with, after this receiving terminal of dtmf signal sound is waited until always and is collected number, finishes this time number gatherer process.
Described method, wherein, if first DTMF number of receiving in the described step b) is based on the band External Number of RFC 2833, then receive this number, confirm that the out-band method that is based on RFC 2833 of the terminal employing of generation dtmf signal sound transmits the dtmf signal sound.
Described method wherein, if first DTMF number of receiving in the described step b) is a number in the band, then needs to wait for a preset time; If during waiting for this preset time, receive band External Number based on RFC 2833, then previous number is abandoned, what the terminal of affirmation generation dtmf signal sound adopted is out-band method; If do not receive number during waiting for this preset time, or receive number in the new band, what then the terminal of affirmation generation dtmf signal sound adopted is that in-band method transmits the dtmf signal sound.
Described method, wherein, described preset time is 20～100 milliseconds.
Described method wherein, is received the DTMF inband signaling and during based on the out of band signal of RFC 2833 at the same time, collects the digits in the DTMF band and starts the monitoring that collects the digits simultaneously based on the outer functional module that collects the digits of DTMF band of RFC 2833.
The self adaptation number-receiving method that a kind of dual-tone multifrequency digital signal band provided by the present invention is interior and band is outer, because having adopted and having detected dtmf signal is to adopt the inband signaling load mode, or adopt method based on RFC2833 out of band signal load mode, it is to adopt in the band to dtmf signal that this method can be discerned sending ending equipment, still the outer mode of band transmits, thereby realize obtaining of DTMF number, realized the DTMF function that collects the digits of self adaptation inside and outside band.
Description of drawings
Fig. 1 is that the transmission of the dtmf signal sound of the inventive method receives schematic diagram;
Fig. 2 is the interior and outer schematic diagram that collects the digits of band of the DTMF band of the inventive method, and it shows the process that only adopts wherein a kind of mode to collect the digits;
Fig. 3 is the interior and outer schematic diagram that collects the digits of band of the DTMF band of the inventive method, and it shows the process that collects the digits simultaneously in two ways.
Embodiment
Below in conjunction with accompanying drawing, will carry out comparatively detailed explanation to each preferred embodiment of the present invention.
The transmission that is the dtmf signal sound as shown in Figure 1 receives schematic diagram, and the dtmf signal sound detection module in gateway/terminal system has realized that the self-adapting detecting of DTMF inband signaling and out of band signal receives, and reports testing result its control module then; Described control module can be controlled the startup of described dtmf signal sound detection module or close detection.Described dtmf signal sound detection module produces the dtmf signal sound by Internet from the opposite end gateway/terminal system receives the RTP data that transmit voice or based on the RTP data of RFC2833.
Be illustrated in figure 2 as the testing process that a kind of mode of the present invention sends signal tone:
1, the gateway/terminal system that receives the dtmf signal sound can not confirm that the gateway/user terminal that produces the dtmf signal sound is in the employing band or is with outer mode to transmit the dtmf signal sound;
2, the gateway/user terminal that produces the dtmf signal sound adopt in the band or band outer in any mode transmit the dtmf signal sound, in other words, can not produce in the band simultaneously and the out of band signal sound.For producing in the band simultaneously and the handling process of out of band signal sound, in Fig. 3, provide.
Confirmed to produce the gateway/user terminal of dtmf signal sound and carry out signal tone and adopt which kind of mode to send if receive the gateway/terminal system of dtmf signal sound, directly startup collects the digits function just accordingly, does not just have flow process shown in Figure 2.
The detection of dtmf signal sound send mode referring to flow process shown in Figure 2, is made an explanation to main step below:
1, when startup collects the digits, can will collect the digits in the DTMF band and start simultaneously, in the monitoring band and the outer professional data of band based on the outer functional module that collects the digits of DTMF band of RFC 2833;
If 2 begin to receive a band External Number based on RFC 2833, then receive this number, close the functional module that collects the digits in the DTMF band, adopt the outer function module monitors business datum that collects the digits of band later on always.In other words, when receiving that first number is the band External Number, just confirmed to produce that gateway/terminal of dtmf signal sound adopts is the send mode of band External Number.
If 3 first DTMF numbers of receiving are numbers in the band, then need to wait for the regular hour (20-100ms).Reason is if what produce that gateway/terminal of dtmf signal sound adopts is the send mode of band External Number, and the band External Number that this gateway/terminal sends is if when converting from the DTMF inband signaling.Exist the dtmf signal sound when inband signaling is transformed into out of band signal and since the inband signaling of former thereby residual one period very short time of algorithm not conversion can cause the mistake of receiving terminal to collect the digits fully.This point is very common.
If 4 during waiting for the regular hour, receive band External Number based on RFC 2833, illustrate that then previous number is the terminal that produces the dtmf signal sound to the residual signal of original dtmf signal sound when inband signaling is transformed into out of band signal.So, previous number is abandoned.
If 5 do not receive number during waiting for the regular hour, perhaps receive number in the new band again, what then the terminal of affirmation generation dtmf signal sound adopted is that in-band method transmits the dtmf signal sound.
6, after which kind of mode is the terminal of confirming generation dtmf signal sound adopt,, the monitoring function that collects the digits of another kind of signal tone is closed in order to save resource and wrong interference that collect the digits.After this, the receiving terminal of dtmf signal sound is waited until always and is collected enough numbers, for example satisfies the template that collects the digits of some service application, finishes this time number gatherer process then.
Shown the inventive method as shown in Figure 3 when the gateway/terminal that produces signal tone sends two kinds of signal tones simultaneously, the gateway/terminal of received signal sound testing process:
After step begins, start simultaneously and collect the digits in the DTMF band and collect the digits outward based on the band of Rfc2833; In the process that in DTMF band, collects the digits, number in the band that receives is judged and received, and judge whether to collect number, as not circulation reception; Then close in this way in the DTMF band and collect the digits process ends.In the process that collects the digits outside the band of DTMF based on Rfc2833, same circulation collects the digits and judges and receive, until collecting number, and after closing then that band is outer and collecting the digits, process ends.
Because most of gateway/terminal systems of prior art generally do not support to send simultaneously the DTMF inband signaling and based on the out of band signal of RFC 2833.The reason that proposes this scheme is that this special applications has certain purposes, because in the process that once collects the digits that receives gateway/terminal, can be simultaneously by receiving two sets of numbers with out-band method in being with, number in one group of band, one group of band External Number can be used in many occasions, for example, at transmitting terminal, can be defined as press key message sent by user to number in the band, the band External Number be defined as the user some such as parameter informations such as positions.
The self adaptation number-receiving method that a kind of dual-tone multifrequency digital signal band provided by the present invention is interior and band is outer, it is to adopt the inband signaling load mode that the detection dtmf signal is provided, still adopt method based on RFC 2833 out of band signal load modes, it is to adopt in the band to dtmf signal that this method can be discerned sending ending equipment, still the outer mode of band transmits, thereby realize obtaining of DTMF number, realized the DTMF function that collects the digits of self adaptation inside and outside band.
Claims (5)
1, the self adaptation number-receiving method that a kind of dual-tone multifrequency digital signal band is interior and band is outer, it may further comprise the steps:
A) start when collecting the digits, will collect the digits in the DTMF band and start simultaneously, in the monitoring band and the outer professional data of band based on the outer functional module that collects the digits of DTMF band of RFC 2833;
B) the DTMF number of receiving is judged that the interior number of band also is based on the band External Number of RFC 2833;
C) after the number mode, the monitoring function that collects the digits of another kind of signal tone is closed in confirming to produce the terminal employing band External Number of dtmf signal sound or being with, after this receiving terminal of dtmf signal sound is waited until always and is collected enough numbers, finishes this time number gatherer process.
2, method according to claim 1, it is characterized in that, if first DTMF number of receiving in the described step b) is based on the band External Number of RFC 2833, then receive this number, confirm that the out-band method that is based on RFC 2833 of the terminal employing of generation dtmf signal sound transmits the dtmf signal sound.
3, method according to claim 1 is characterized in that, if first DTMF number of receiving in the described step b) is a number in the band, then needs to wait for a preset time; If during waiting for this preset time, receive band External Number based on RFC 2833, then previous number is abandoned, what the terminal of affirmation generation dtmf signal sound adopted is out-band method; If do not receive number during waiting for this preset time, or receive number in the new band, what then the terminal of affirmation generation dtmf signal sound adopted is that in-band method transmits the dtmf signal sound.
4, method according to claim 3 is characterized in that, described preset time is 20～100 milliseconds.
5, method according to claim 1, it is characterized in that, described method is received the DTMF inband signaling and during based on the out of band signal of RFC 2833 at the same time, collects the digits in the DTMF band and starts the monitoring that collects the digits simultaneously based on the outer functional module that collects the digits of DTMF band of RFC 2833.
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| CNB2005100340606A CN100525355C (en) | 2005-04-06 | 2005-04-06 | Self-adaptive in-band and out-of-band number-receiving method for dual-tone multifrequency digital signal |
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| CNB2005100340606A CN100525355C (en) | 2005-04-06 | 2005-04-06 | Self-adaptive in-band and out-of-band number-receiving method for dual-tone multifrequency digital signal |
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| CN100525355C true CN100525355C (en) | 2009-08-05 |
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| CN101179535B (en) * | 2006-11-10 | 2010-12-22 | 华为技术有限公司 | Dual-tone multi-frequency signal processing method and system |
| CN102571718A (en) * | 2010-12-20 | 2012-07-11 | 中国移动通信集团浙江有限公司 | Voice call handover method based on IMS network and handover application server |
| CN102394994B (en) * | 2011-11-02 | 2013-09-25 | 上海市共进通信技术有限公司 | Method for realizing remote simulation key control based on telephone |
| CN102427565B (en) * | 2011-11-24 | 2017-12-22 | 杭州世导通讯有限公司 | A kind of implementation method of communication of enterprise switchboard |
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