CN102025850A - Method and system for mutually converting dual-tone multifrequency (DTMF) signals between in-band and out-band - Google Patents
Method and system for mutually converting dual-tone multifrequency (DTMF) signals between in-band and out-band Download PDFInfo
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Abstract
The invention discloses a method for mutually converting dual-tone multi-frequency (DTMF) signals between in-band and out-band. The method is suitable for a system comprising first media gateway control equipment and first media processing equipment, and comprises the following steps: the first media gateway control equipment informs the first media process equipment that a voice speech channel resource is occupied for a long time; and the first media process equipment detects DTMF signals by using the voice speech channel resource in band, and reports the numbers of the detected DTMF signals to the first media gateway control equipment for out- band transmission. By the invention, not only can the damage caused by directly transmitting the DTMF signals in band be avoided, but also the dedicated DTMF detection resource can be saved.
Description
Technical field
The present invention relates to communication technical field, be meant the method and system that a kind of dtmf signal changes inside and outside band mutually especially.
Background technology
MGCP (H.248/MEGACO) is next generation network (NGN, Next Generation Network) interface protocol in, it is applied to, and medium among the NGN are handled and signaling control separates the control interface that is then produced, and are used for media gateway controlling equipment (as Media Gateway Controller, Softswitch etc.) and the communication between the medium processing device (as gateway, media server, IP intelligent terminal or the like) accordingly.Just adopted this agreement between Media Gateway Controller (MGC, Media Gateway Controller) and the media gateway (MGW, Media GateWay).
At present, the dual mode of interoffice transmission dual-tone multifrequency (DTMF, Dual Tone Multi Frequency) signal is:
The one,, dtmf signal transmits on the interoffice medium face of IP carrying with speech form.When MGW one side is time division multiplexing (TDM, when Time Division Multiplex) carrying, opposite side are the IP carrying, because the service quality (Qos of IP, Quality of Service) and reason such as compression coding and decoding, dtmf signal from the TDM side transmits on IP with voice mode if still be, in transmission course, may damage, will cause to discern dtmf signal.
The one,, configuration DTMF detects resource on TDM, after the number that detects dtmf signal, number is reported MGC by the Mc mouth.Wherein, prior art adopts special-purpose DTMF to detect resource and detects dtmf signal, and it is limited that special-purpose DTMF detects resource, is taken for a long time if special-purpose DTMF detects resource, certainly will cause special-purpose DTMF to detect a large amount of uses of resource.Because interoffice is to transmit on IP with voice mode when transmitting dtmf signal, and voice speech channel resource itself just has the function that detects dtmf signal, and therefore, this mode has used extra special-purpose DTMF to detect resource, cause extra waste, improved operation cost.
Summary of the invention
In view of this, the method and system that main purpose of the present invention is to provide a kind of dtmf signal to change mutually inside and outside band, in the time of can solving dtmf signal and on the interoffice medium face of IP carrying, transmit with speech form, owing to the problem that can't discern dtmf signal that damage causes takes place in the transmission course, and special-purpose DTMF detects the problem of the wasting of resources.
In order to achieve the above object, technical scheme of the present invention is achieved in that
The invention provides the method that a kind of dtmf signal changes inside and outside band mutually, be applicable to the system that comprises the first media gateway controlling equipment and first medium processing device, this method comprises:
The first media gateway controlling equipment notifies the first medium processing device voice speech channel resource to be taken for a long time;
Described first medium processing device uses described voice speech channel resource to detect the Dual Tone Multifrequency signal in band, and the number of detected dtmf signal is reported the described first media gateway controlling equipment is with outer the transmission.
Wherein, the first media gateway controlling equipment notifies the first medium processing device voice speech channel resource to be taken for a long time, is specially:
The described first media gateway controlling equipment issues the protocol package of a H248 protocol definition to the chain of command of described first medium processing device, and described protocol package is used to inform that the described first medium processing device voice speech channel resource will be taken for a long time.
This method also comprises: the attribute of a voice speech channel resource occupation of definition in described protocol package, inform by the property value of described attribute whether the described voice speech channel resource of described first medium processing device can be taken for a long time.
Described first medium processing device uses the voice speech channel resource to detect dtmf signal in band, comprising:
The chain of command of described first medium processing device is known when the voice speech channel resource will be taken for a long time, according to the detection indication that collects the digits that the described first media gateway controlling equipment issues, notify the medium face of first medium processing device to use described voice speech channel resource to detect dtmf signal;
The medium face of described first medium processing device reports the number of detected dtmf signal the chain of command of described first medium processing device;
The chain of command of described first medium processing device reports the described first media gateway controlling equipment with described number.
Described system also comprises the second media gateway controlling equipment and second medium processing device, correspondingly, described number is sent to the described first media gateway controlling equipment be with outer transmission, comprising:
The described first media gateway controlling equipment sends to the second media gateway controlling equipment with described number.
After the described second opposite end media gateway controlling equipment received described number, this method also comprised:
The described second media gateway controlling equipment issues the protocol package of described definition to the chain of command of described second medium processing device, informs that the described second medium processing device voice speech channel resource will be taken for a long time.
This method also comprises:
The chain of command of described second medium processing device is known when the voice speech channel resource will be taken for a long time, send out number indication according to what the described second media gateway controlling equipment issued, notifying the medium face of second medium processing device to use described voice speech channel resource is described dtmf signal with described number translated, sends.
The system that the present invention also provides a kind of dtmf signal to change mutually inside and outside band comprises: the first media gateway controlling equipment and first medium processing device; Wherein,
The described first media gateway controlling equipment is used to notify the described first medium processing device voice speech channel resource to be taken for a long time;
Described first medium processing device is used for using in band described voice speech channel resource to detect dtmf signal, and the number of detected dtmf signal is reported the described first media gateway controlling equipment is with outer the transmission.
Described first medium processing device comprises first chain of command and the first medium face; Wherein:
Described first chain of command is used to receive the protocol package of the H248 protocol definition that the described first media gateway controlling equipment issues, and described protocol package is used to inform that the described voice speech channel resource of described first medium processing device will be taken for a long time;
Described first chain of command also is used to know when the voice speech channel resource will be taken for a long time, according to the detection indication that collects the digits that the described first media gateway controlling equipment issues, notifies the described first medium face to use described voice speech channel resource to detect described dtmf signal;
The described first medium face is used to use the voice speech channel resource to detect dtmf signal; And the number of detected dtmf signal reported described first chain of command;
Described first chain of command also is used for described number is reported the described first media gateway controlling equipment.
This system also comprises the second media gateway controlling equipment and second medium processing device; Described second medium processing device comprises second chain of command and the second medium face; Wherein:
The described second media gateway controlling equipment is used to receive the described number that the described first media gateway controlling equipment sends; After also being used to receive described number, issue described protocol package, inform that the described second medium processing device voice speech channel resource will be taken for a long time to described second chain of command;
Described second chain of command, described voice speech channel resource is used to know when will be taken for a long time, according to number indication that the described second media gateway controlling equipment issues, notifying the described second medium face to use the voice speech channel resource is described dtmf signal with described number translated;
The described second medium face, also being used to use the voice speech channel resource is described dtmf signal with described number translated, and sends.
The core concept of the scheme that DTMF of the present invention changes inside and outside band mutually is: protocol package of definition in the H248 agreement: resource occupation bag when long, and whether the resource occupation bag indicates the voice traffic resource will to be taken for a long time during by this length; If can be taken for a long time, then notify medium processing device in band, to use this voice speech channel resource to detect dtmf signal, and the number of detected dtmf signal is reported media gateway controlling equipment (it is outer to change band in the band) by the Mc mouth.With form (number) band outside the transmission of dtmf signal with numeral, the damage in the time of can avoiding dtmf signal directly in band, to transmit; Use the voice speech channel resource to detect dtmf signal simultaneously and saved special-purpose DTMF detection resource.
Description of drawings
The method flow schematic diagram that Fig. 1 changes inside and outside band mutually for dtmf signal of the present invention;
The schematic diagram that Fig. 2 changes inside and outside band mutually for tandem exchange of the present invention interoffice dtmf signal;
Fig. 3 is the schematic flow sheet that dtmf signal changes inside and outside band mutually in one embodiment of the invention.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
The core concept of the scheme that DTMF of the present invention changes inside and outside band mutually is: protocol package of definition in the H248 agreement, and resource occupation bag in the time of can being referred to as length, whether the resource occupation bag comes the voice speech channel resource can be taken for a long time during by this length; If can be taken for a long time, then notify medium processing device in band, to use this voice speech channel resource to detect dtmf signal, and the number of detected dtmf signal is reported media gateway controlling equipment (it is outer to change band in the band) by the Mc mouth.Damage when so having avoided dtmf signal directly in band, to transmit; Use the voice speech channel resource to detect dtmf signal simultaneously and saved special-purpose DTMF detection resource.
Wherein, be meant medium face, the outer chain of command that is meant of band in the so-called band.
The present invention uses protocol package of H248 protocol definition, and the resource occupation bag can certainly have other name in the time of can being referred to as length.The resource occupation bag informs that medium processing device voice speech channel resource will be taken for a long time during by this length, require the chain of command of medium processing device receiving that this bag back notice medium face (promptly in the band) carries out the detection of dtmf signal with the voice speech channel resource that this meeting is taken for a long time, concrete, the attribute of a voice speech channel resource occupation is set in this protocol package, inform by the property value of this attribute whether medium processing device voice speech channel resource can be taken for a long time, when for example value is for On (0x0001), represent that this DTMF resource will be taken for a long time; When the setting of this property value also can have other modes.
Be that example describes with protocol package resource occupation bag when growing below, as shown in table 1:
Table 1
In the table 1, Properties is an attribute, the attribute that finger speech sound traffic resource takies; Description has pointed out the implication of this attribute, is meant that voice speech channel will be taken for a long time or can not taken for a long time; Default is a default value, and " Off " (0x0000) represents can not taken for a long time; In actual applications, Default can be made amendment,, then be revised as " On " (0x0001) if the voice speech channel resource can be taken for a long time.
Certainly, the form of the protocol package of the present invention's definition is not limited in this, as long as can inform that medium processing device voice speech channel resource will be taken for a long time by this protocol package.
Medium processing device is learnt and according to the indication of media gateway controlling equipment, will be used the voice speech channel resource to detect dtmf signal when the voice speech channel resource will be taken for a long time.
As shown in Figure 1, the dtmf signal of the present invention method of changeing mutually inside and outside band comprises:
Step 101, the first media gateway controlling equipment notify the first medium processing device voice speech channel resource to be taken for a long time.
Mainly to be the first media gateway controlling equipment issue the protocol package of a H248 protocol definition to the chain of command of first medium processing device in the realization of this step, resource occupation bag when long promptly of the present invention.
Wherein, first medium processing device uses the voice speech channel resource to detect dtmf signal in band, mainly comprise: the chain of command of first medium processing device is known when the voice speech channel resource will be taken for a long time, according to the detection indication that collects the digits that the first media gateway controlling equipment issues, notify the medium face of first medium processing device to use the voice speech channel resource to detect dtmf signal; The medium face of first medium processing device reports the number of detected dtmf signal the chain of command of first medium processing device; The chain of command of first medium processing device reports this number the first media gateway controlling equipment again.
In addition, be with outer transmission to be meant that mainly the first media gateway controlling equipment sends to this number the second media gateway controlling equipment, is opposite end media gateway controlling equipment, be about to dtmf signal with digital form, promptly be included in the chain of command transmission.
Then, the second media gateway controlling equipment issues the protocol package of definition to the chain of command of second medium processing device, informs that the second medium processing device voice speech channel resource will be taken for a long time;
The chain of command of second medium processing device is when knowing that the voice speech channel resource will be taken for a long time, send out number indication according to what the second media gateway controlling equipment issued, notifying the medium face of second medium processing device to use the voice speech channel resource that this is stated number translated is dtmf signal, sends.
Wherein, medium processing device can be media gateway, media server, IP intelligent terminal or the like, and the present invention is that example is carried out follow-up explanation with media gateway (MGW), and then the chain of command of MGW is its H248G unit; Media gateway controlling equipment can be Media Gateway Controller, Softswitch etc., and the present invention is that example is carried out follow-up explanation with Media Gateway Controller (MGC).
The schematic diagram that changes mutually inside and outside band below in conjunction with tandem exchange's interoffice dtmf signal shown in Figure 2 illustrates the solution of the present invention, wherein, medium processing device is that example, media gateway controlling equipment are example with MGC with MGW, is undertaken alternately by the H248.1 agreement of Mc mouth between MGC and the MGW (H248G unit); Tandem exchange's one end inserts from PSTN (PSTN, Public Switched Telephone Network), other networks of a termination; Incoming and outgoing end are the TDM carrying in the tandem exchange; Interoffice is call control protocol BICC (the Bearer Independent Call Control protocol) carrying that work out and bearer independent of ITU-TSG11 group; Be carried as real time transport protocol (RTP, Real-time Transport Protocol) between MGW1 and the MGW2 medium face.Wherein, the first media gateway controlling equipment is MGC1, and first medium processing device is MGW1; The second media gateway controlling equipment is MGC2, and second medium processing device is MGW2; In actual applications, MGC1 and MGC2 can not occur at same intra-office, but it is far away to be separated by.
As shown in the figure, dtmf signal is from the TDM side of MGW1 (in the band) Incoming, used the voice speech channel resource to detect by the medium face of MGW1 (in the band) after, the number (digital form) of detected this dtmf signal is reported the H248G unit of MGW1; The H248G unit structure Mc message order of MGW1 reports MGC1 (it is outer to change band in the band) with described number.The number of dtmf signal is transmission (MGC1 sends MGC2 to) outside band; MGC2 sends dtmf signal by Mc message order indication MGW2 from the TDM side.
Method of the present invention is not only applicable to the application scenarios of above-mentioned tandem exchange, is applicable to common traffic office etc. yet.
Figure 3 shows that the schematic flow sheet that dtmf signal changes inside and outside band mutually in one embodiment of the invention, comprise the steps:
Step 301, the H248G unit of MGC1 and MGW1 is undertaken alternately by the H248.1 agreement, MGC1 issues resource occupation bag when long to the H248G unit of MGW1, wherein indicate the voice traffic resource will to be taken for a long time (if can not take for a long time, then adopting special-purpose DTMF to detect resource according to prior art detects, repeats no more herein).
Step 302, MGC1 issues to collect the digits to the H248G unit of MGW1 by the Mc mouth and detects indication.
Step 303, the H248G unit of MGW1 is known when the voice speech channel resource will be taken for a long time, detects indication according to collecting the digits, and the medium face of notice MGW1 uses the voice speech channel resource that dtmf signal is detected, concrete detection means is a prior art, repeats no more herein.
Step 304, the medium face of MGW1 detect (essence is that detected dtmf signal is converted to digital form, is number) behind the number of dtmf signal, do not carry out medium face packing transmission but this number are reported the H248G unit of MGW1.
Step 305, the H248G unit of MGW1 reports MGC1 with this number by the order of Mc message.
Step 306, MGC1 sends this number to MGC2.
Step 307 after MGC2 receives this number, issues when long the resource occupation bag to the H248G unit of MGW2 and wherein indicates the voice traffic resource to be taken for a long time.
Step 308, MGC2 issues to the H248G unit of MGW2 by the Mc mouth and sends out number indication.
Step 309, the H248G unit of MGW2 is known when the voice speech channel resource will be taken for a long time, according to sending out number indication, the medium face of notice MGW2 uses the voice speech channel resource with this number translated as dtmf signal (essence is according to number recovery dtmf signal), send.
In order to realize above-mentioned mutual shifting method, the invention provides the system that a kind of DTMF changes inside and outside band mutually, comprising: the first media gateway controlling equipment and first medium processing device; Wherein,
The described first media gateway controlling equipment is used to notify the described first medium processing device voice speech channel resource to be taken for a long time; Described first medium processing device is used for using in band described voice speech channel resource to detect dtmf signal, and the number of detected dtmf signal is reported the described first media gateway controlling equipment is with outer the transmission.
Wherein, first medium processing device comprises first chain of command and the first medium face; Wherein:
First chain of command is used to the protocol package of the H248 protocol definition that the first media gateway controlling equipment that receives issues, and protocol package is used to inform that the first medium processing device voice speech channel resource will be taken for a long time;
First chain of command also is used to know when the voice speech channel resource will be taken for a long time, according to the detection indication that collects the digits that the first media gateway controlling equipment issues, notifies the first medium face to use the voice speech channel resource to detect dtmf signal;
The first medium face is used to use the voice speech channel resource to detect dtmf signal; And the number of detected dtmf signal reported first chain of command;
First chain of command also is used for number is reported the first media gateway controlling equipment.
This system also comprises the second media gateway controlling equipment and second medium processing device; Second medium processing device comprises second chain of command and the second medium face; Wherein:
The second media gateway controlling equipment is used to the number that the first media gateway controlling equipment that receives sends; After also being used to receive number, issue protocol package, inform that the second medium processing device voice speech channel resource will be taken for a long time to second chain of command;
Second chain of command is used to know when the voice speech channel resource will be taken for a long time, according to number indication that the second media gateway controlling equipment issues, notifies the second medium face to use the voice speech channel resource that number translated is dtmf signal;
The second medium face also is used to use the voice speech channel resource that number translated is dtmf signal, and sends.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the method that dtmf signal changes inside and outside band mutually is applicable to the system that comprises the first media gateway controlling equipment and first medium processing device, it is characterized in that this method comprises:
The first media gateway controlling equipment notifies the first medium processing device voice speech channel resource to be taken for a long time;
Described first medium processing device uses described voice speech channel resource to detect the Dual Tone Multifrequency signal in band, and the number of detected dtmf signal is reported the described first media gateway controlling equipment is with outer the transmission.
2. the method for changeing mutually inside and outside band according to the described dtmf signal of claim 1 is characterized in that the first media gateway controlling equipment notifies the first medium processing device voice speech channel resource to be taken for a long time, is specially:
The described first media gateway controlling equipment issues the protocol package of a H248 protocol definition to the chain of command of described first medium processing device, and described protocol package is used to inform that the described first medium processing device voice speech channel resource will be taken for a long time.
3. the method for changeing mutually inside and outside band according to the described dtmf signal of claim 2, it is characterized in that, this method also comprises: the attribute of a voice speech channel resource occupation of definition in described protocol package, inform by the property value of described attribute whether the described voice speech channel resource of described first medium processing device can be taken for a long time.
4. the method for changeing mutually inside and outside band according to the described dtmf signal of claim 2 is characterized in that, described first medium processing device uses the voice speech channel resource to detect dtmf signal in band, comprising:
The chain of command of described first medium processing device is known when the voice speech channel resource will be taken for a long time, according to the detection indication that collects the digits that the described first media gateway controlling equipment issues, notify the medium face of first medium processing device to use described voice speech channel resource to detect dtmf signal;
The medium face of described first medium processing device reports the number of detected dtmf signal the chain of command of described first medium processing device;
The chain of command of described first medium processing device reports the described first media gateway controlling equipment with described number.
5. the method for changeing mutually inside and outside band according to the described dtmf signal of claim 4, it is characterized in that described system also comprises the second media gateway controlling equipment and second medium processing device, correspondingly, described number is sent to the described first media gateway controlling equipment is with outer transmission, comprising:
The described first media gateway controlling equipment sends to the second media gateway controlling equipment with described number.
6. the method for changeing mutually inside and outside band according to the described dtmf signal of claim 5 is characterized in that after the described second opposite end media gateway controlling equipment received described number, this method also comprised:
The described second media gateway controlling equipment issues the protocol package of described definition to the chain of command of described second medium processing device, informs that the described second medium processing device voice speech channel resource will be taken for a long time.
7. the method for changeing mutually inside and outside band according to the described dtmf signal of claim 6 is characterized in that this method also comprises:
The chain of command of described second medium processing device is known when the voice speech channel resource will be taken for a long time, send out number indication according to what the described second media gateway controlling equipment issued, notifying the medium face of second medium processing device to use described voice speech channel resource is described dtmf signal with described number translated, sends.
8. the system that dtmf signal changes inside and outside band mutually is characterized in that, comprising: the first media gateway controlling equipment and first medium processing device; Wherein,
The described first media gateway controlling equipment is used to notify the described first medium processing device voice speech channel resource to be taken for a long time;
Described first medium processing device is used for using in band described voice speech channel resource to detect dtmf signal, and the number of detected dtmf signal is reported the described first media gateway controlling equipment is with outer the transmission.
9. the system that described according to Claim 8 dtmf signal changes inside and outside band mutually is characterized in that described first medium processing device comprises first chain of command and the first medium face; Wherein:
Described first chain of command is used to receive the protocol package of the H248 protocol definition that the described first media gateway controlling equipment issues, and described protocol package is used to inform that the described voice speech channel resource of described first medium processing device will be taken for a long time;
Described first chain of command also is used to know when the voice speech channel resource will be taken for a long time, according to the detection indication that collects the digits that the described first media gateway controlling equipment issues, notifies the described first medium face to use described voice speech channel resource to detect described dtmf signal;
The described first medium face is used to use the voice speech channel resource to detect dtmf signal; And the number of detected dtmf signal reported described first chain of command;
Described first chain of command also is used for described number is reported the described first media gateway controlling equipment.
10. the system that changes mutually inside and outside band according to the described dtmf signal of claim 9 is characterized in that this system also comprises the second media gateway controlling equipment and second medium processing device; Described second medium processing device comprises second chain of command and the second medium face; Wherein:
The described second media gateway controlling equipment is used to receive the described number that the described first media gateway controlling equipment sends; After also being used to receive described number, issue described protocol package, inform that the described second medium processing device voice speech channel resource will be taken for a long time to described second chain of command;
Described second chain of command, described voice speech channel resource is used to know when will be taken for a long time, according to number indication that the described second media gateway controlling equipment issues, notifying the described second medium face to use the voice speech channel resource is described dtmf signal with described number translated;
The described second medium face, also being used to use the voice speech channel resource is described dtmf signal with described number translated, and sends.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1878324A (en) * | 2006-07-12 | 2006-12-13 | 华为技术有限公司 | Method for detecting multi-frequency signal |
| US20080137650A1 (en) * | 2006-12-11 | 2008-06-12 | Parameswaran Kumarasamy | Conversion of dtmf carrying ip packets |
| CN101860630A (en) * | 2010-06-22 | 2010-10-13 | 中兴通讯股份有限公司 | Transmission method and system of out-of-band dual tone multiple frequency (DTMF) signal |
-
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1878324A (en) * | 2006-07-12 | 2006-12-13 | 华为技术有限公司 | Method for detecting multi-frequency signal |
| US20080137650A1 (en) * | 2006-12-11 | 2008-06-12 | Parameswaran Kumarasamy | Conversion of dtmf carrying ip packets |
| CN101860630A (en) * | 2010-06-22 | 2010-10-13 | 中兴通讯股份有限公司 | Transmission method and system of out-of-band dual tone multiple frequency (DTMF) signal |
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Application publication date: 20110420 |