CN101699919B - Transmission method and device for DTMF signals - Google Patents
Transmission method and device for DTMF signals Download PDFInfo
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- CN101699919B CN101699919B CN 200910235322 CN200910235322A CN101699919B CN 101699919 B CN101699919 B CN 101699919B CN 200910235322 CN200910235322 CN 200910235322 CN 200910235322 A CN200910235322 A CN 200910235322A CN 101699919 B CN101699919 B CN 101699919B
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- dtmf signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
- H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
- H04M7/1295—Details of dual tone multiple frequency signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1016—IP multimedia subsystem [IMS]
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Abstract
The invention provides a transmission method and a device for DTMF signals, which belongs to the field of network communications. The method comprises the following steps: acquiring a DTMF signal transmission mode supported by AS; comparing whether the DTMF signal transmission mode supported by AS is the same as the received DTMF signal transmission mode or not, if so, transmitting the received DTMF signal to the AS; and if not, converting the received DTMF signal transmission mode into the DTMF signal transmission mode supported by the AS, and transmitting to the AS. The method and the device can ensure that the DTMF signal can be transmitted to the IMS domain to be processed by AS.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of transmission method and device of touch-tone signal.
Background technology
Along with developing rapidly of core network technology; Make operator often need manage a plurality of networks simultaneously; Like global system for mobile communications (Global System for Mobile Communications; GSM), code division multiple access (Code Division Multiple Access, CDMA) network and IP Multimedia System (IPMultimedia Subsystem, IMS) network.As emerging IMS network, because the business that provides is abundant, operator often tends to let the IMS network provide professional for the user of other networks, and this just need forward other network users' calling to the IMS territory, is exactly usually said " grappling " technology.
The inventor finds in the grappling process, to exist following problem:
Dual-tone multifrequency (Dual Tone Multi Frequency, DTMF) signal anchor to the IMS territory (Application Server, in the time of AS), AS might not support the dtmf signal transmission means, thereby causes dtmf signal can't forward the IMS territory to.
Summary of the invention
Embodiment of the present invention provides a kind of transmission method and device of touch-tone signal, and this method and device can guarantee that dtmf signal can forward the AS processing in IMS territory to.
Embodiment of the present invention provides a kind of transmission method of touch-tone signal, and said method comprises:
Obtain the dual tone multi-frequency dtmf signal transmission form that application server AS is supported;
Whether the dtmf signal transmission means that more said AS supports is identical with the dtmf signal transmission means that receives, and then the dtmf signal that receives is transferred to AS as identical; Otherwise after the dtmf signal transmission means that receives being changed over the dtmf signal transmission means of this AS support, be transferred to AS.
The present invention also provides a kind of transmitting device of touch-tone signal, and said device comprises:
Acquiring unit is used to obtain the dual tone multi-frequency dtmf signal transmission form that application server AS is supported;
Comparing unit, whether the dtmf signal transmission means that is used for more said AS support is identical with the dtmf signal transmission means that receives;
Transmission unit is used at said comparing unit the dtmf signal that receives being transferred to AS relatively when identical; Be used at said comparing unit relatively for not simultaneously, the dtmf signal transmission means that receives is changed over the dtmf signal transmission means that this AS supports after, be transferred to AS.
Can find out by the above-mentioned technical scheme that provides; The technical scheme of the embodiment of the invention is owing to obtained the dtmf signal transmission means that AS supports in advance; And this transmission means and the dtmf signal transmission means that receives compared; When identical, directly transmit, when inequality, transmit after the dtmf signal transmission means that receives changed over the dtmf signal transmission means that AS supports; No matter thereby which kind of transmission means AS supports, MGCF can guarantee that all the AS that dtmf signal is forwarded to the IMS territory handles.
Description of drawings
The flow chart of the transmission method of a kind of touch-tone signal that Fig. 1 provides for the specific embodiment of the invention;
The flow chart of the transmission method of a kind of touch-tone signal that Fig. 2 provides for one embodiment of the invention;
The flow chart of the transmission method of a kind of touch-tone signal that Fig. 3 provides for another embodiment of the present invention;
Fig. 4 is the present invention's flow chart of the transmission method of a kind of touch-tone signal of providing of an embodiment also;
Fig. 5 is the structure chart of the transmitting device of a kind of touch-tone signal provided by the invention.
Embodiment
Touch-tone signal forwards the IMS territory to has two kinds of transmission methods; Method one, MGCF (Media Gateway Control Function; MGCF) WMG (the IMS Media Gateway of control IP Multimedia System; IMS-MGW) after receiving dtmf signal, directly dtmf signal is sent in voice channel on the AS in IMS territory; Usually method one is called in the dtmf signal band and transmits.IMS-MGW is after receiving dtmf signal in method two, MGCF control, directly dtmf signal is extracted, through conversation initialized protocol (Session Initiation Protocol, SIP) signaling is sent on the AS in IMS territory; Usually method two being called the dtmf signal band transmits outward
Embodiment of the present invention provides a kind of transmission method of touch-tone signal, and this method is as shown in Figure 1, comprising:
S11, obtain the dtmf signal transmission means that AS supports;
S12, relatively whether the dtmf signal transmission means supported of this AS is identical with the dtmf signal transmission means that receives, and then carries out S13 otherwise carries out S14 as identical;
S13, the dtmf signal that receives is transferred to AS;
S14, the dtmf signal transmission means that receives changed over the dtmf signal transmission means that this AS supports after, be transferred to AS.
Above-mentioned steps all can be accomplished separately by MGCF, is perhaps accomplished by MGCF control IMS-MGW; Be specially: when dtmf signal was transmitted as the outer transmission of band, above-mentioned steps was accomplished separately by MGCF, and when being transmitted as in the band transmission like dtmf signal, then S13 is accomplished by MGCF control IMS-MGW, was transferred to AS also by MGCF control IMS-MGW transmission among the S14.
MGCF obtain the dtmf signal transmission means that AS supports method can for; MGCF initiatively sends a request message that obtains transmission means and gives AS; AS returns the response message of this request message and gives MGCF, and this response message comprises the dtmf signal transmission means that AS supports.Optional, AS also can directly issue a message that has the dtmf signal transmission means of its support and give MGCF, can certainly the dtmf signal transmission means of its support be sent to MGCF through the SIP signaling.Specifically can for load in the SIP signaling extend markup language (Extensible Markup Language, XML) body carries the dtmf signal transmission means; Can certainly expand the header field of SIP signaling, the dtmf signal transmission means is carried in the header field of expansion, can also be for a parameter be set in the SIP signaling, this parameter is used to represent the dtmf signal transmission means.The present invention does not limit to the concrete grammar that obtains.
Optional; MGCF can also hold consultation with AS, and its concrete negotiation mode is that MGCF sends to AS with the dtmf signal transmission means; Concrete mode can send to AS through the SIP signaling, and its implementation can send to the dtmf signal transmission means of its support the method for MGCF referring to AS; Can certainly the dtmf signal transmission means be sent to AS with a special message, the present invention does not limit to concrete implementation.
The dtmf signal transmission means that above-mentioned AS supports specifically can for: the band of transmission or dtmf signal transmits outward in the band of dtmf signal.
Method provided by the invention is owing to obtained the dtmf signal transmission means that AS supports in advance; And this transmission means and the dtmf signal transmission means that receives compared; When identical, directly transmit, when inequality, transmit after the dtmf signal transmission means that receives changed over the dtmf signal transmission means that AS supports; No matter thereby which kind of transmission means AS supports, MGCF can guarantee that all the AS that dtmf signal is forwarded to the IMS territory handles.
The present invention provides another embodiment; Present embodiment provides a kind of transmission method of touch-tone signal; The technological scene that present embodiment is realized is: the dtmf signal transmission means that AS supports is transmission in the dtmf signal band; The dtmf signal that obtains also is transmission in the band, and the method that then realizes is as shown in Figure 2, comprising:
S21, MGCF send session to AS and set up message;
S22, AS are carried at the dtmf signal transmission means of its support in the header field of SIP signaling (being that response message is set up in session) and send to MGCF;
Can certainly be carried at the SIP signaling extend markup language (Extensible MarkupLanguage, XML) in the body, or can also a parameter be set in the SIP signaling and carry.
The dtmf signal transmission means that this AS supports specifically can be transmission in the DTMF band;
S23, MGCF control IMS-GW receive dtmf signal; IMS-GW confirms that this transmission means that receives dtmf signal is transmission in the DTMF band; And reporting MGCF, MGCF confirms that this dtmf signal transmission means that receives is identical with the dtmf signal transmission means that AS supports;
S24, MGCF control IMS-GW send to AS with the dtmf signal that obtains.
The method that present embodiment provides is transmission in the band owing to obtained the dtmf signal transmission means of AS support in advance; And confirm that the dtmf signal transmission means that receives also is when being with interior the transmission; Directly the dtmf signal that receives is sent to AS; No matter thereby which kind of transmission means AS supports, MGCF all can guarantee dtmf signal is forwarded to the AS processing in IMS territory.
The present invention provides another embodiment; Present embodiment provides a kind of transmission method of touch-tone signal; The technological scene that present embodiment is realized is: the dtmf signal transmission means that AS supports is transmission in the dtmf signal band; The dtmf signal that obtains is the outer transmission of band, and the method that then realizes is as shown in Figure 3, comprising:
The dtmf signal transmission means that S31, MGCF obtain the AS support is transmission in the band;
Its concrete implementation does; MGCF sends session to AS and sets up message; AS sets up response message (the concrete form of expression can be the SIP signaling) through session and the dtmf signal transmission means of its support is carried at the extend markup language of SIP signaling (Extensible Markup Language XML) sends to MGCF in the body.Concrete implementation method can for:
INVITE?tel:+8675528780808?SIP/2.0
Via:SIP/2.0/UDP?pc33.atlanta.com；branch＝z9hG4bK776asdhds
Max-Forwards:70
To:Bob<tel:+8675528780808>
From:Alice<tel:+8675528780807>；tag＝1928301774
Call-ID:a84b4c76e66710pc33.atlanta.com
CSeq:314159INVITE
Contact:<tel:+8675528780808>
Content-Type:dtmf-info
Content-Length:50
<dtmf-info>
<require>in-band-dtmf</require>
</dtmf-info>
Wherein,<require>In-band-dtmf</require>Expression AS requires to transmit in the DTMF use band;
MGCF holds consultation with AS according to self-ability, and its concrete avatar is that to AS response sip message, this sip message carries the dtmf signal transmission means of its use, is specially:
SIP/2.0?200OK
Via:SIP/2.0/UDP?server?10.biloxi.com
；branch＝z9hG4bKnashds8；received＝192.0.2.3
Via:SIP/2.0/UDP?bigbox3.site3.atlanta.com
；branch＝z9hG4bK77ef4c2312983.1；received＝192.0.2.2
Via:SIP/2.0/UDP?pc33.atlanta.com
；branch＝z9hG4bK776asdhds；received＝192.0.2.1
To:Bob<sip:bobbiloxi.com>；tag＝a6c85cf
From:Alice<sip:aliceatlanta.com>；tag＝1928301774
Call-ID:a84b4c76e66710pc33.atlanta.com
CSeq:314159INVITE
Contact:<sip:bob192.0.2.4>
Content-Type:dtmf-info
Content-Length:131
<dtmf-info>
<accept>in-band-dtmf</accept>
</dtmf-info>
Can certainly be carried in the header field of SIP signaling, or can also a parameter be set in the SIP signaling and carry.
S32, MGCF receive dtmf signal, and confirm that this dtmf signal transmission means that receives is the outer transmission of band;
Above-mentioned affirmation dtmf signal transmission means can be referring to the associated description H.248 for the concrete grammar of the outer transmission of band.
It is different that S33, MGCF compare the dtmf signal transmission means that this dtmf signal transmission means that receives and AS support;
S34, MGCF will change over the dtmf signal of transmission in the band with the dtmf signal of outer transmission;
The concrete mode of its realization is the outer dtmf signal that transmits of band to be pressed onto in the speech path channel to transmit, the dtmf signal of transmission in the dtmf signal that is about to the outer transmission of band changes over and is with.
Above-mentioned dtmf signal is pressed onto method concrete in the speech path channel can be referring to the associated description of agreement in H.248.
Dtmf signal after S35, MGCF control IMS-GW will change sends to AS.
The method that present embodiment provides is transmission in the band owing to obtained the dtmf signal transmission means of AS support in advance; And confirm that the dtmf signal transmission means that receives is when being with outer the transmission; Transmit being with the outer dtmf signal that transmits to be pressed onto in the speech path channel; And the dtmf signal after will changing sends to AS, thereby no matter which kind of transmission means AS supports, the AS that MGCF all can guarantee dtmf signal is forwarded to the IMS territory handles.
The present invention provides another embodiment; Present embodiment provides a kind of transmission method of touch-tone signal; The technological scene that present embodiment is realized is: the dtmf signal transmission means that AS supports is that the dtmf signal band transmits outward; The dtmf signal that obtains also is the outer transmission of band, and the method and the embodiment one that then realize are similar, repeat no more.
The present invention provides an embodiment again; Present embodiment provides a kind of transmission method of touch-tone signal; The technological scene that present embodiment is realized is: the dtmf signal transmission means that AS supports is that the dtmf signal band transmits outward, and the dtmf signal that obtains is transmission in the band, and the method that then realizes is as shown in Figure 4:
The dtmf signal transmission means that S41, MGCF obtain the AS support is the outer transmission of band;
Its mode of obtaining can for; MGCF sends session to AS and sets up message; AS sets up response message (the concrete form of expression can be the SIP signaling) through session the dtmf signal transmission means that AS supports is sent to MGCF, is specially, through the dtmf signal transmission means that a parameter representes that AS supports is set in the SIP signaling; Express support for transmission in the band as 1,0 expresses support for the outer transmission of band.
Can certainly carry through expansion XML message body or header field.
S42, MGCF receive dtmf signal, and confirm that this dtmf signal transmission means that receives is transmission in the band;
S43, MGCF will change over the dtmf signal of the outer transmission of band with the dtmf signal of interior transmission;
The concrete mode of its realization does, extracts the dtmf signal of transmission in the band, and the dtmf signal of this extraction is carried in the out-of-band signalling, and this out-of-band signalling specifically can do, Session Initiation Protocol signaling.
The above-mentioned concrete grammar that dtmf signal is extracted can be referring to the associated description of agreement in H.248.
Dtmf signal after S44, MGCF will change sends to AS.
The method that present embodiment provides is the outer transmission of band owing to obtained the dtmf signal transmission means of AS support in advance; And confirm that the dtmf signal transmission means that receives is when being with interior the transmission; The dtmf signal of transmission in the band is extracted the transmission of employing Session Initiation Protocol; And the dtmf signal after will changing sends to AS, thereby no matter which kind of transmission means AS supports, the AS that MGCF all can guarantee dtmf signal is forwarded to the IMS territory handles.
The present invention also provides a kind of transmitting device of touch-tone signal, and this device is as shown in Figure 5, comprising:
Acquiring unit 51 is used to obtain the dual tone multi-frequency dtmf signal transmission form that application server AS is supported;
Comparing unit 52, whether the dtmf signal transmission means that is used for more said AS support is identical with the dtmf signal transmission means that receives;
Transmission unit 53 is used at said comparing unit the dtmf signal that receives being transferred to AS relatively when identical; Be used at said comparing unit relatively for not simultaneously, the dtmf signal transmission means that receives is changed over the dtmf signal transmission means that this AS supports after, be transferred to AS.
Optional, above-mentioned transmission unit 53 can also be used for the dtmf signal transmission means that AS supports is sent to AS.
Optional, above-mentioned acquiring unit 51 comprises:
First receiver module 511 is used to receive the Session initiation protocol SIP signaling that is loaded with the dtmf signal transmission means that AS supports,
First extraction module 512 is used for extracting the dtmf signal transmission means that SIP signaling AS supports.
Optional, above-mentioned acquiring unit 51 can also comprise:
Sending module 513 is used to send a request message,
Second receiver module 514 is used to receive the response message of described request message, and said response message carries the dtmf signal transmission means that AS supports,
Second extraction module 515 is used for extracting the dtmf signal transmission means that the AS of said response message supports.
First and second receiver module can be arranged to a receiver module in actual conditions, and first and second extraction module also can be arranged to an extraction module certainly.
Acquiring unit 51 in the device provided by the invention is owing to obtained the dtmf signal transmission means that AS supports in advance; And this transmission means and the dtmf signal transmission means that receives are compared by comparing unit 52; Directly transmit when the coming to the same thing relatively by transmitting element 53; When inequality; Transmit after the dtmf signal transmission means that receives changed over the dtmf signal transmission means that AS supports, thereby no matter which kind of transmission means AS supports, the AS that MGCF all can guarantee dtmf signal is forwarded to the IMS territory handles.
It will be appreciated by those skilled in the art that accompanying drawing is the sketch map of a preferred embodiment, module in the accompanying drawing or flow process might not be that embodiment of the present invention is necessary.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method can instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; This program comprises one of step or its combination of method embodiment when carrying out.
In sum, the technical scheme that the specific embodiment of the invention provides has and can guarantee that the AS that dtmf signal can forward the IMS territory to handles.
More than the embodiment of the invention has been carried out detailed introduction, used concrete example among this paper principle of the present invention and execution mode set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. the transmission method of a touch-tone signal is characterized in that, said method comprises:
Obtain the dual tone multi-frequency dtmf signal transmission form that application server AS is supported;
Whether the dtmf signal transmission means that more said AS supports is identical with the dtmf signal transmission means that receives, and then the dtmf signal that receives is transferred to AS as identical; Otherwise after the dtmf signal transmission means that receives being changed over the dtmf signal transmission means of this AS support, be transferred to AS;
Wherein, the dtmf signal transmission means of supporting like said AS is transmission in the band, and the said dtmf signal transmission means that receives is the outer transmission of band, then saidly the dtmf signal transmission means that receives is changed over the dtmf signal transmission means that this AS supports is specially:
The dtmf signal of the outer transmission of band is pressed onto in the conversation speech channel.
2. method according to claim 1 is characterized in that, the dual tone multi-frequency dtmf signal transmission form that the said AS of obtaining supports is specially:
Reception is loaded with the Session initiation protocol SIP signaling of the dtmf signal transmission means of AS support, extracts the dtmf signal transmission means that AS supports in the SIP signaling;
Or send a request message, receiving the response message of described request message, said response message carries the dtmf signal transmission means that AS supports, extracts the dtmf signal transmission means that the AS in the said response message supports.
3. method according to claim 2 is characterized in that, the SIP signaling of the dtmf signal transmission means that the said AS of being loaded with supports is specially:
The dtmf signal transmission means that AS is supported is carried in the expandable mark language XML body of SIP signaling;
Or the dtmf signal transmission means that AS is supported is carried in the header field of SIP signaling;
Or the dtmf signal transmission means that AS is supported is carried in the parameter of SIP signaling.
4. according to the arbitrary described method of claim 1 to 3; It is characterized in that; The dtmf signal transmission means of supporting like said AS is the outer transmission of band; The said dtmf signal transmission means that receives is transmission in the band, then saidly the dtmf signal transmission means that receives is changed over the dtmf signal transmission means that this AS supports is specially:
Extract the dtmf signal of transmission in the band, the dtmf signal that extracts is carried in the out-of-band signalling.
5. method according to claim 1 is characterized in that, said method also comprised before relatively:
The dtmf signal transmission means that AS is supported sends to AS.
6. the transmitting device of a touch-tone signal is characterized in that, said device comprises:
Acquiring unit is used to obtain the dual tone multi-frequency dtmf signal transmission form that application server AS is supported;
Comparing unit, whether the dtmf signal transmission means that is used for more said AS support is identical with the dtmf signal transmission means that receives;
Transmission unit is used at said comparing unit the dtmf signal that receives being transferred to AS relatively when identical; Be used at said comparing unit relatively for not simultaneously, the dtmf signal transmission means that receives is changed over the dtmf signal transmission means that this AS supports after, be transferred to AS; Wherein, The dtmf signal transmission means of supporting like said AS is transmission in the band; The said dtmf signal transmission means that receives is the outer transmission of band, and then said transmission unit is specially the dtmf signal transmission manner that the dtmf signal transmission means that receives changes over this AS support: will be pressed onto with the dtmf signal of outer transmission in the conversation speech channel.
7. device according to claim 6 is characterized in that, said device also comprises:
Transmitting element is used for the dtmf signal transmission means that AS supports is sent to AS.
8. device according to claim 6 is characterized in that, said acquiring unit comprises:
First receiver module is used to receive the Session initiation protocol SIP signaling that is loaded with the dtmf signal transmission means that AS supports,
First extraction module is used for extracting the dtmf signal transmission means that SIP signaling AS supports.
9. device according to claim 6 is characterized in that, said acquiring unit comprises:
Sending module is used to send a request message,
Second receiver module is used to receive the response message of described request message, and said response message carries the dtmf signal transmission means that AS supports,
Second extraction module is used for extracting the dtmf signal transmission means that the AS of said response message supports.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910235322 CN101699919B (en) | 2009-09-30 | 2009-09-30 | Transmission method and device for DTMF signals |
| PCT/CN2010/077520 WO2011038693A1 (en) | 2009-09-30 | 2010-09-30 | Method and device for transmitting dual tone multi frequency signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910235322 CN101699919B (en) | 2009-09-30 | 2009-09-30 | Transmission method and device for DTMF signals |
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| CN101699919A CN101699919A (en) | 2010-04-28 |
| CN101699919B true CN101699919B (en) | 2012-05-23 |
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| CN 200910235322 Expired - Fee Related CN101699919B (en) | 2009-09-30 | 2009-09-30 | Transmission method and device for DTMF signals |
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| CN (1) | CN101699919B (en) |
| WO (1) | WO2011038693A1 (en) |
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| CN101699919B (en) * | 2009-09-30 | 2012-05-23 | 华为技术有限公司 | Transmission method and device for DTMF signals |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101394443A (en) * | 2008-10-24 | 2009-03-25 | 华为技术有限公司 | Method, system and device for in-band number receiving |
| CN101472019A (en) * | 2007-12-25 | 2009-07-01 | 华为技术有限公司 | Method, system and device for mutually communicating outband DTMF signaling |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7656862B2 (en) * | 2005-08-29 | 2010-02-02 | At&T Intellectual Property I, L.P. | Methods, systems, and devices for providing voice-call services responsive to a dialed sequence |
| CN101132380A (en) * | 2006-08-21 | 2008-02-27 | 华为技术有限公司 | Interaction method, device and system for dual-tone multi-frequency in separation structure |
| CN101699919B (en) * | 2009-09-30 | 2012-05-23 | 华为技术有限公司 | Transmission method and device for DTMF signals |
-
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- 2009-09-30 CN CN 200910235322 patent/CN101699919B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101472019A (en) * | 2007-12-25 | 2009-07-01 | 华为技术有限公司 | Method, system and device for mutually communicating outband DTMF signaling |
| CN101394443A (en) * | 2008-10-24 | 2009-03-25 | 华为技术有限公司 | Method, system and device for in-band number receiving |
Non-Patent Citations (1)
| Title |
|---|
| 吕振华.软交换与3G网络互通关键技术分析.《邮电设计技术》.2006,(第2期),第12-16页. * |
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| CN101699919A (en) | 2010-04-28 |
| WO2011038693A1 (en) | 2011-04-07 |
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