CN104253914A - VBD (voice band data) exciting event negotiation method and media gateway therefor - Google Patents

Abstract

The invention provides a VBD (voice band data) exciting event negotiation method and a media gateway therefor. After the media gateway configures a VBD exciting event set for user equipment connected to the media gateway, during user equipment media session setup, according to the VBD exciting event set, a valid VBD exciting event set is negotiated between the media gateway negotiates and an opposite media gateway being in session with media; then, the media gateway determines a VBD mode status according to the negotiated valid VBD exciting event set and a received VBD exciting event. In this way, the VBD mode switching operation can be negotiated between the media gateways according to application needs of different user devices, and an actual user device can support various different VBD exciting event sets.

Description

A method for negotiating voice-band data stimulus event and its media gateway

technical field

The invention relates to the technical field of communication, in particular to a VBD incentive event negotiation method and a media gateway for voice band data (VBD) services faced in IP packet network transmission.

Background technique

Voice-band data (VBD) traffic is typically carried by circuit-switched systems and equipment. With the advent of Internet Protocol (IP) transport-optimized networks, more and more voice-band data traffic is expected to The media gateway setup in the network has the appropriate codecs for these signals. Voiceband data can carry modem, fax, and text phone signals over the voice channel of the IP packet network.

When a media gateway (for example: access gateway AG and SIP voice gateway) detects any VBD stimulus (Stimuli) event, it will switch to VBD mode. The modulation and demodulation signal is transmitted through the voice channel of the IP packet network.

Typically, VBD stimulus events are defined by ITU V.152, RFC2833, and RFC4734. According to the application type, these protocols define a VBD stimulus that a media gateway must detect, so as to control the media gateway to switch to VBD operation when it detects these VBD stimulus model.

However, in some actual usage scenarios, it is unacceptable for all user equipments that the media gateway switch to the VBD mode immediately after detecting any VBD incentive event. For example: 1), the media gateway will switch to VBD mode when it detects the DTMF signal of the text phone, but it does not need to switch to the VBD mode for non-text phones 2), some user equipment with special voice mail service functions require the media gateway There is no need to switch to VBD mode when a CNG signal is detected; 3), some user equipment with special test functions require the media gateway to not need to switch to VBD mode when a 2225Hz answer tone is detected; 4), some have specific application functions Even if the user equipment requires that the media gateway detects any VBD excitation signal, it does not need to switch to the VBD mode; Switch to VBD mode after VBD stimulus event.

In view of the aforementioned problems, under the existing network system, if a user equipment does not want the media gateway to switch to the VBD mode when it detects certain VBD incentive events, then the media gateways that provide services for it need to be configured to detect these events. VBD incentive events do not switch to VBD mode; however, although these VBD incentive event restrictions are only set for the user equipment, this will affect other user equipment connected to the entire network system, that is: in the existing network mode, All media gateway devices in the entire network system can only have one same set of VBD incentive events.

Contents of the invention

The present invention aims to provide a technical solution for mutually negotiating effective VBD incentive events between media gateways, so that media gateways can use different VBD incentive event sets according to the requirements of different user equipments and decide whether to switch to VBD mode accordingly.

According to one aspect of the present invention, a method for voiceband data (VBD) stimulus event negotiation in a media gateway is provided here, wherein, the media gateway configures a VBD stimulus event set for the connected user equipment; During the establishment process, the media gateway negotiates an effective VBD incentive event set with the peer media gateway of the media session according to the VBD incentive event set; after that, the media gateway negotiates an effective VBD incentive event set and the received The VBD stimulus event determines its VBD mode state.

According to another aspect of the present invention, a kind of media gateway that is used for voice band data (VBD) incentive event negotiation is provided here, and it comprises, storage means, is used to save a VBD incentive event collection for connected user equipment; Control means , used to negotiate an effective set of VBD incentive events with the peer media gateway of the media session according to the set of VBD incentive events during the establishment of the media session of the user equipment; and the executing means, according to the negotiated effective set of VBD incentive events, And the received VBD stimulus event determines its VBD mode state.

According to the embodiment provided by the present invention, the media gateways can negotiate VBD mode switching according to the application requirements of different user equipments, and make the actual user equipments support various different VBD incentive event sets at the same time.

Description of drawings

The features, nature and advantages of the present invention will become more apparent from the detailed description set forth below when taken in conjunction with the accompanying drawings, in which like elements have like reference numerals, in which:

Fig. 1 is an embodiment provided by the present invention - the user equipment is configured not to switch to the VBD mode under specific VBD incentives;

Fig. 2 is an embodiment provided by the present invention - the user equipment is configured not to switch to the VBD mode under any VBD excitation;

Fig. 3 is an embodiment provided by the present invention-the user equipment is configured to use the VBD mode when the media session is established and initialized;

Fig. 4 is an embodiment provided by the present invention - the peer media gateway does not support the modified SDP protocol attribute.

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Fig. 1 is an embodiment provided by the present invention - the user equipment is configured not to switch to the VBD mode under a specific VBD stimulus (or switch to the VBD mode under a specific VBD stimulus event set), the user equipment 1 in the illustration does not support compliance For the fax calling tone (CNG) of Recommendation ITU-T T.30, the media gateway 1 will not include the VBD incentive event in the VBD incentive event set configured for it, and the media session between the user equipment 1 and any user equipment During the process, if both media gateways detect the specific VBD incentive event, they will not switch to the VBD mode (or both media gateways will switch to the VBD mode when they detect other negotiated valid VBD incentive events).

Step S101, user equipment 1 initiates an initialization call, aiming at initiating a media session request to user equipment 2;

Step S102, the media gateway 1 connected to the user equipment 1 will send a session initiation protocol (SIP)-based INVITE message request to create a multimedia session to the media gateway 2 corresponding to the destination user terminal 2, according to the embodiment provided by the present invention , during the session establishment process of the user terminal 1, the media gateway 1 will negotiate with the peer media gateway 2 of the media session a valid VBD incentive event set supported by both parties according to the aforementioned configured VBD incentive event set.

Usually, the media gateway 1 uses the SDP protocol to describe the load situation and characteristics of the user terminal 1, and the 'gpmd' (generic media descriptor) attribute in the INVITE message is used to combine the payload type of the media information ('m') line with the VBD mode . The general form of such an attribute line is:

m=audio 49172 RTP/AVP 8 97

a=gpmd:97 vbd=yes

a=vbdtrigger: 23-35, 37-63

Among them, the second a=gpmd:<format><parameter list>

Within the scope of the VBD specification, <format> is an RTP/AVP payload type. <parameter list> is a semicolon-separated list of "parameter=value" and "parameter=value" pairs. For the RTP/AVP format, these paired address parameters are not part of the standard MIME definition. An important parameter is the boolean parameter "vbd", which must have the value 'yes' or 'no'. When its value is 'yes', this attribute indicates that the implementation supports VBD mode. In general, any codec that omits setting the 'gpmd' attribute/value pair to 'vbd=yes' in an SDP session description is considered not to support the VBD mode of operation.

Here, for media sessions that support VBD mode, we further define an SDP protocol 'Vbdtrigger' (VBD trigger parameter) attribute to carry the set of VBD stimulus events requested by media gateway 1. Here we use the modulator defined in the RFC4734 specification , fax, or text phone signaling events represent the aforementioned VBD stimulus event sets 23-35, 37-63, wherein the VBD stimulus event set does not include the Fax Call Tone (CNG) 36 event.

Step S103, after receiving the aforementioned Invite message, the media gateway 2 will respond with a 200OK message according to the load and characteristics of the called user equipment 2, which includes the corresponding SDP protocol 'Vbdtrigger' attribute to carry the information received by the media gateway 2. VBD incentive event sets 23-35, 37-62, here, the VBD incentive event sets responded by the media gateway 2 will further not include (V32AA) 63 events that the user equipment 2 does not support.

Step S104, the media gateway 1 sends an ACK message to confirm that the session negotiation is completed;

Step S105, so far, the session negotiation between the media gateway 1 and the media gateway 2 can establish a corresponding media session; at the same time, the two parties reach a valid VBD incentive event set VBD incentive event set 23-35, 37-62.

Step S106, according to the embodiment of the present invention, it is assumed here that when the media gateway 2 receives the VBD incentive event from the user equipment 2—fax calling tone (CNG), according to the effective VBD incentive event set negotiated in the aforementioned media session, the fax If the call tone does not belong to one of the valid VBD incentive event sets between UE 1 and 2, MG 2 will not initiate VBD switching.

Similarly, when media gateway 1 receives the VBD incentive event-ITU V.32AA63 from user equipment 1, according to the set of valid VBD incentive events negotiated in the aforementioned media session, the VBD incentive event does not belong to between user equipment 1 and 2. One of the valid VBD incentive event sets, MG1 will not initiate VBD switching.

Step S107, if the media gateway 1 or 2 receives the VBD incentive event from the respective user equipment 1, 2 and belongs to one of the aforementioned valid VBD incentive event sets, they will perform corresponding VBD switching.

It is worth noting that in the foregoing example, user equipment 1 is used as the caller of the media session. Those skilled in the art can understand that when user equipment 1 is the called party, when the corresponding media gateway 1 receives the corresponding media establishment request, its The Response Accepted VBD Stimulus Event Set will also not contain the aforementioned Stimulus Event 63 - Fax Calling Tone (CNG) event code.

Fig. 2 is an embodiment provided by the present invention-the user equipment is configured not to switch to the VBD mode under any VBD excitation, in the illustration, the user equipment 1 is configured not to switch to the VBD mode during any VBD excitation, in step In S202, the media gateway 1 connected to the user equipment 1 will send an INVITE message based on the Session Initiation Protocol (SIP) to the media gateway 2 corresponding to the destination user terminal 2 to request to create a multimedia session. Media gateway 1 will send a media session description attribute with "a=vbdtrigger: NULL" in the media session establishment process, for requesting media gateway 2 not to switch VBD mode when detecting any VBD trigger event; Step S203, media After receiving the aforementioned INVITE message, the gateway 2 will respond with a 200OK message according to the load and characteristics of the called user equipment 2, which includes the corresponding SDP protocol 'a=vbdtrigger: NULL' attribute to confirm that it supports this mode; Step S204, the media gateway 1 sends an ACK message to confirm the completion of the session negotiation; step S205, the media gateways establish an RTP session according to the negotiation; step S206, even if the media gateways of both parties detect any VBD incentive event, they do not need to switch to VBD mode;

Fig. 3 is an embodiment provided by the present invention-the device is configured to use the VBD mode when the media session is established and initialized, in the illustration, the user equipment 1 is configured to use the VBD mode when initializing the call, wherein, in step S302, the user equipment 1 The connected media gateway 1 will send a session initiation protocol (SIP)-based INVITE message request to create a multimedia session to the media gateway 2 corresponding to the destination user terminal 2. The media gateway 1 connected to the user equipment 1 is in the media In the session establishment process, a media session description attribute with "a=vbdtrigger: CallInital" will be sent, which is used to request the media gateway 2 to directly enter the VBD mode without detecting any VBD trigger event; step S303, the media gateway 2 is receiving After the aforementioned INVITE message, according to the load situation and characteristics of the called user equipment 2, a 200OK message will be responded, which includes the corresponding SDP protocol 'a=vbdtrigger: CallInital' attribute to confirm that it supports this mode; step S304, the media Gateway 1 sends an ACK message to confirm that the session negotiation is complete; step S305, when the media session is established, the media gateways of both parties directly enter the VBD mode (load type 97) in the aforementioned session negotiation process, rather than after detecting the VBD incentive event Then switch to VBD mode.

Fig. 4 is a kind of embodiment provided by the present invention-the other party's media gateway does not support the SDP agreement attribute after this modification, and media gateway 2 does not recognize " a=vbdtrigger " in the illustration, it will ignore this value, will be connected between media gateways Follow the normal VBD switching mode. Wherein, wherein, in step S302, the media gateway 1 connected to the user equipment 1 will send an INVITE message request based on the Session Initiation Protocol (SIP) to the media gateway 2 corresponding to the destination user terminal 2 to create a multimedia session, the user The media gateway 1 connected to the device 1 will send a media session description attribute with "a=vbdtrigger: CallInital" or the previous media session description attribute with "a=vbdtrigger: NULL" during the establishment of the media session, or The aforementioned media session description attribute including a set of VBD incentive events is used to request the media gateway 2 to directly enter the VBD mode without detecting any VBD incentive events, or not to switch the VBD mode when any VBD incentive events are detected, or to Switch to the VBD mode when one of the VBD incentive event sets is detected; step 403, after the media gateway 2 receives the aforementioned INVITE message, according to the load situation and characteristics of the called user equipment 2, it will respond with a 200 OK message, including the corresponding SDP The agreement will not include the 'a=vbdtrigger' attribute to indicate that the media gateway does not support this attribute; step S404, the media gateway 1 sends an ACK message to confirm that the session negotiation is completed; step S405, the media gateways set up an RTP session (Voice ); step S406, the media gateway 2 will not support the agreed set of VBD incentive events, and it will switch to the VBD mode (load type 97) in the aforementioned session negotiation process when it receives any VBD incentive event.

It is worth noting that, in the above-mentioned embodiments, only the specific transmission protocol based on the session description SDP protocol--SIP protocol description is described, but the negotiation rules are also applicable to other transmission protocols, including and not limited to media gateway control MGCP protocol, ITU H.248 protocol, or other control protocols.

Although the above description provides some embodiments for the present invention, it is not intended to limit the protection scope of the present invention. Those skilled in the art can make various modifications to the embodiments without departing from the scope and spirit of the present invention. Such modifications are within the scope of the present invention.

Claims (12)

1. in media gateway for voiceband data (VBD) actuation event consult a method, comprise the steps:

A), be connected user device configuration VBD actuation event set;

B), in subscriber equipment media session process of establishing, media gateway to be held consultation the set of an effective VBD actuation event according to the opposite end media gateway of the set of described VBD actuation event and media session;

C), media gateway determines its VBD mode state according to consulted effective VBD actuation event set and received VBD actuation event.

2. method as claimed in claim 1, it is characterized in that described step b) in, the particular communication protocol of described negotiation dialogue-based description SDP protocol mode realizes, and host-host protocol comprises Session initiation protocol SIP, MGCP MGCP, ITU H.248 agreement or other call control protocols.

3. method as claimed in claim 1, it is characterized in that described step b) in, media gateway identifies by SDP Session Description Protocol one agreement attribute (Vbdtrigger) the VBD actuation event set supported in a media session process, and its attribute codomain carries media gateway is asked or VBD actuation event that is that accept set.

4. the method as described in claim as arbitrary in claims 1 to 3, is characterized in that the signaling event coded representation of modulator, fax or text by phone that described VBD actuation event set adopts RFC4734 specification to define.

5. method as described in claim as arbitrary in claim 3, it is characterized in that described step b) in, wherein, described attribute codomain uses particular text value (Callintial), is not needing to detect that any VBD actuation event directly enters VBD pattern for asking media session opposite end media gateway.

6. method as described in claim as arbitrary in claim 3, it is characterized in that described step b) in, described attribute codomain uses particular text value (Null), does not switch VBD pattern for asking the media gateway of media session opposite end when any VBD actuation event being detected.

7., for the media gateway that voiceband data (VBD) actuation event is consulted, it is characterized in that comprising:

Storage device, for preserving the set of a VBD actuation event for connected subscriber equipment;

Control device, in subscriber equipment media session process of establishing, to hold consultation the set of an effective VBD actuation event according to the set of described VBD actuation event and media session opposite end media gateway;

Final controlling element, determines its VBD mode state according to consulted effective VBD actuation event set and received VBD actuation event.

8. media gateway as claimed in claim 6, it is characterized in that the particular communication protocol of described control device dialogue-based description SDP protocol mode consults the set of an effective VBD actuation event, host-host protocol comprises Session initiation protocol SIP, MGCP MGCP, H.248 agreement or other call control protocols.

9. media gateway as claimed in claim 6, it is characterized in that described control device uses and identify the set of described VBD actuation event based on SDP Session Description Protocol one agreement attribute (Vbdtrigger), its attribute codomain carries media gateway is asked or VBD actuation event that is that accept set.

10. the media gateway as described in claim as arbitrary in claim 7 to 9, is characterized in that the signaling event coded representation of modulator, fax or text by phone that described VBD actuation event set adopts RFC4734 specification to define.

Media gateway as described in 11. claims as arbitrary in claim 9, it is characterized in that described attribute codomain is a particular text value (Callintial), for asking the opposite end media gateway of media session not needing to detect that any VBD actuation event directly enters VBD pattern, final controlling element is not needing to detect that any VBD actuation event directly enters VBD pattern.

Media gateway as described in 12. claims as arbitrary in claim 9, it is characterized in that described attribute codomain is a particular text value (Null), for asking media session opposite end media gateway not switch VBD pattern when any VBD actuation event being detected, final controlling element does not switch VBD pattern when any VBD actuation event being detected.