WO2008040186A1 - Procédé, système et passerelle destinés à négocier la capacité d'un détecteur de signal des données - Google Patents

Procédé, système et passerelle destinés à négocier la capacité d'un détecteur de signal des données Download PDF

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Publication number
WO2008040186A1
WO2008040186A1 PCT/CN2007/002816 CN2007002816W WO2008040186A1 WO 2008040186 A1 WO2008040186 A1 WO 2008040186A1 CN 2007002816 W CN2007002816 W CN 2007002816W WO 2008040186 A1 WO2008040186 A1 WO 2008040186A1
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WIPO (PCT)
Prior art keywords
gateway
data signal
signaling
signal detector
sender
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PCT/CN2007/002816
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English (en)
French (fr)
Inventor
Tong Jin
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP07816432.4A priority Critical patent/EP2071771B1/en
Publication of WO2008040186A1 publication Critical patent/WO2008040186A1/zh
Priority to US12/412,212 priority patent/US8179927B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems 
    • H04L12/56Packet switching systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/66Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Definitions

  • the present invention relates to a method and system for negotiating data signal detector capabilities, and a gateway, and more particularly to a method for negotiating data signal detector capability in voice packet data (VBD, Voice-Band Data) transmission in a packet network fax service And the system, the sender gateway and the receiver gateway having the capability of negotiating the number of signal detectors.
  • VBD voice packet data
  • VAD Voice-Band Data
  • the 21st century will be the century of sustained and rapid development of the information industry. Human beings have entered the era of network economy.
  • the rapid development of network technology makes it possible to use packet technology to transmit multimedia. Since the media streams transmitted in different communication networks are encoded differently, the codec needs to be converted by the codec at the combination point of different communication networks. The device that implements this conversion is called a gateway.
  • the media streams processed by the gateway mainly include: a voice stream, a data stream, a video stream, and the like.
  • the data stream mainly refers to the signals sent by the data devices such as fax machines, digital modems, and text phones during the interaction.
  • the main methods for transmitting data streams through the gateway are: VBD mode and forwarding mode.
  • the VBD mode refers to low-loss codec processing by using a codec with a relatively small signal impairment
  • the proposed codec standard is ITU-T G.711 and ITU-T G. 726o
  • IP Internet Protocol
  • the "Relay” method refers to a protocol that specifies a data signal conversion transmission method.
  • the data signal sent by the data device at the transmitting end is converted into a data packet suitable for transmission by the IP bearer network and transmitted to the opposite gateway, and then restored to the data device of the receiving end by modulation, such as ITU-T T.38.
  • modulation such as ITU-T T.38.
  • the advantage of this method is that it has stronger resistance to various damages on the IP network, and greatly improves the success rate and stability of the data service.
  • the disadvantage is that the implementation is more complicated, and the processing power of the gateway is relatively large.
  • VBD Real-time Transport Protocol
  • FIG. 1 is a block diagram of the traditional VBD communication system. The principle is as shown in the figure: After the data signal passes through the voice encoder, the gateway transmits to the receiver gateway through the communication channel, and the receiver gateway outputs the reconstructed data signal through the voice decoder.
  • the most widely used machine supporting a maximum speed of 14400 bit/s is that the fax process is half-duplex, which means that more than 50% of the time of the fax process is muted by the fax machine.
  • FIG. 2 is a schematic block diagram of a VBD mode communication system using a data signal detector, the principle of which is shown in the figure.
  • the system includes three modules: the sender gateway, the communication channel, and the receiver gateway.
  • the sender gateway has a data signal detector, a low-loss voice coder and a non-voice coder.
  • the receiver gateway has a voice decoder and a non-voice decoder.
  • the communication channel is generally an IP network.
  • the data signal After the data signal enters the sender gateway, it is first divided into equally spaced signal frames.
  • the frame length depends on the encoding protocol used by the encoder, typically between 5 and 30 milliseconds.
  • the data signal detector then analyzes each of the input signal frames and divides the signal frame into a data signal frame and a non-data signal frame depending on whether or not the valid data signal is carried. If the input signal frame is a data signal frame, the data signal detector controls the signal frame to enter the speech coder for low-loss speech coding. Otherwise, the data signal detector controls the signal frame to enter the non-speech encoder for silent compression coding.
  • the information output by the voice encoder is called a voice packet, and the information output by the non-voice encoder is called a mute packet.
  • the information in the mute packet is only used to restore silence, so the code rate is very low, and the voice packet rate is less than ten.
  • the receiving gateway After receiving the voice packet, the receiving gateway sends the voice decoder to decode the voice and outputs a valid data signal. After receiving the silence packet, the gateway sends the non-voice decoder to reconstruct the mute signal.
  • the signal frame is divided into a data signal frame and a non-data signal (mute ⁇ ) frame by the data signal detector, and different coding modes are adopted for these frames, and only a small amount of mute information is transmitted during the non-effective data signal, relative to all signals.
  • the frame is sent to the speech coder without discrimination, which greatly reduces the output bit rate.
  • the H.248 Protocol is the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T, International)
  • Telecommunications Union - Telecommunication Standardization Sector A protocol specifically designed for media resource control that can be used to control media processing devices such as media gateways and media servers.
  • the basic principle of the protocol is: abstracting various resources on the media processing device into endpoints, which are further divided into physical endpoints and temporary endpoints.
  • the physical endpoints represent some physical entities with semi-permanent existence, such as Time Division Multiplex (TDM) time slots; the temporary endpoints represent common resources released after the temporary application is used, such as RTP streams.
  • TDM Time Division Multiplex
  • RTP streams Real-Time Division Multiplex
  • T/CN2007/002816 point and context operations are accomplished by command requests and responses between the media control device and the media processing device, including commands for additions, modifications, deletions, notifications, etc.; command parameters are called descriptors, classified as attributes (Property), Signal (Signal), Event (Event), Statistics (Statistic).
  • SIP Session Initiation Protocol
  • IETF Internet Engineering Task Force
  • SIP is a text-based application layer control protocol that is independent of the underlying transport protocol for establishing, modifying, and terminating two or more multimedia sessions over an IP network.
  • the SIP protocol supports functions such as proxying, redirection, and registration of users.
  • SIP can also support voice, video, data, email, online chat, games and more.
  • SDP Session Description Protocol
  • Media information contained in the session including: media type (such as video, voice, etc.), transport protocol (such as RTP UDP/IP, H.320, etc.), media format (such as H.263, G711, etc.), multiple Broadcast or remote (unicast) address and port;
  • media type such as video, voice, etc.
  • transport protocol such as RTP UDP/IP, H.320, etc.
  • media format such as H.263, G711, etc.
  • multiple Broadcast or remote (unicast) address and port including:
  • Protocols such as SIP and H.248 use SDP to describe media resource attributes.
  • 0, 18, and 98 in the first line are the payload types of the RTP packet.
  • the load type below 96 is the static load type, which means fixed, defined in RFC3551; the load type is between 96 ⁇ 127 is the dynamic load type, the meaning of which needs to be temporarily used. definition. So the first line in the above example indicates that the device supports three payload types 0, 18, and 98, where 0 represents G.711 u law and 18 represents G.729; the second line defines the dynamic load type 98 as G. 711 A law, sampling rate is 8000Hz; The third line indicates that 98 this type of payload is used in VBD mode, implicitly indicating that it supports VBD capability.
  • Embodiments of the present invention provide a method and system for negotiating a data signal detector capability, a sender gateway having a capability of negotiating a data signal detector, and a receiver gateway, which are used to solve the packet network fax service existing in the prior art. There is no question of negotiating the ability of the data signal detector when transmitting with VBD.
  • the method for negotiating data signal detector capability in the embodiment of the present invention includes the following steps:
  • the sender gateway sends the first signaling including the data signal detector support capability message when the voiceband data is transmitted;
  • the sender gateway receives, by the receiving gateway, the sender gateway, according to the received first signaling, whether the sender gateway sends data according to a data signal detector, and if so, determining to start the non-voice decoder to decode the mute packet; otherwise, determining not to start the non-initiation
  • the voice decoder decodes the mute packet.
  • the method further comprises the following steps:
  • the receiver gateway When the receiver gateway is unable to activate the non-voice decoder, the receiver gateway feeds back to the sender gateway a second signaling including a data signal detector support capability message;
  • the sender gateway transmits data according to the received second signaling in a manner that does not include a data signal detector.
  • the sender gateway and the receiver gateway perform data signal detection by using the H.248 protocol.
  • the receiver capability is negotiated, and the receiver gateway feeds back the second signaling by using the second media processing device and the media control device, and the sender gateway receives the second signaling by using the media control device and the first media processing device.
  • the sender gateway and the receiver gateway perform data signal detector capability negotiation by using a session initial protocol, and the receiver gateway requests the initiator to send the second signaling by using a session initiation protocol message, and the sender gateway passes The session initiation protocol message answering end receives the second signaling.
  • the sender gateway and the receiver gateway perform data signal detector capability negotiation by using the H.248 protocol, and the sender gateway sends the first signaling by the first media processing device and the media control device, and receives The party gateway receives the first signaling by using the media control device and the second media processing device.
  • the sender gateway and the receiver gateway perform data signal detector capability negotiation by using a session initial protocol, and the sender gateway requests the initiator to send the first signaling by using a session initial protocol message, and the receiver gateway passes The session initiation protocol message answering end receives the first signaling.
  • the first signaling is sent according to a session description protocol.
  • the first signaling is sent according to a session description protocol when negotiating a voiceband data signal detector capability according to the ITU-T V.152 protocol.
  • the first signaling is sent after carrying a gpmd attribute message of the session description protocol.
  • the second signaling is sent according to a session description protocol.
  • the second signaling is sent according to a session description protocol when negotiating a voiceband data signal detector capability according to the ITU-T V.152 protocol.
  • the second signaling is sent after carrying the gpmd attribute information of the session description protocol.
  • the embodiment of the invention further provides a system for negotiating data signal detector capability, which is applied to a packet network fax service, including a sender gateway, a receiver gateway, the sender gateway including a data signal detector, and the receiver gateway.
  • the non-voice decoder further includes a first sending device connected to the sender gateway and a first receiving device connected to the receiver gateway, where: a first sending device, configured to send, when the sender gateway voiceband data is transmitted, first signaling that includes a data signal detector support capability message;
  • a first receiving device configured to receive the first signaling
  • the receiving gateway identifies, according to the first signaling received by the first receiving device, whether the sending gateway sends data according to a data signal detector, and if so, determines to start a non-voice decoder to mute the packet. Decode; otherwise it is decided not to start the non-voice decoder to decode the mute packet.
  • the method further includes: a second sending device connected to the receiver gateway, and a second receiving device connected to the sender gateway, where:
  • a second sending device configured to: when the receiver gateway fails to start the non-voice decoder, feed back a second signaling that includes a data signal detector support capability message;
  • a second receiving device configured to receive the second signaling
  • the sender gateway transmits data according to the second signaling received by the second receiving device in a manner that does not include a data signal detector.
  • the sender gateway and the receiver gateway perform data signal detector capability negotiation in the H.248 protocol
  • the second sending device and the second receiving device send and receive through the media processing device and the media control device. Second signaling.
  • the second sending device requests the initiator to send the second signaling by using a session initiation protocol message.
  • the second receiving device receives the second signaling by using the session initiation protocol message replying end.
  • the sender gateway and the receiver gateway perform data signal detector capability negotiation in the H.248 protocol
  • the first sending device and the first receiving device send and receive through the media processing device and the media control device.
  • the first signaling is
  • the first sending device requests the initiator to send the first signaling by using a session initiation protocol message.
  • Receiving, by the first receiving device, the message receiving terminal through the session initiation protocol The first signaling.
  • the first sending device and the first receiving device send and receive the first signaling according to a session description protocol.
  • the first transmitting device and the first receiving device send and receive the first signaling according to a session description protocol when the data signal detector capability is negotiated according to the ITU-T V.152 protocol.
  • the first sending device sends after the first signaling carries a gpmd attribute message of the session description protocol.
  • the second sending device and the second receiving device send the second signaling according to a session description protocol.
  • the second sending device and the second receiving device send and receive the second signaling according to the session description protocol when the data signal detector capability is negotiated according to the ITU-T V.152 protocol.
  • the second sending device sends after the second signaling carries a gpmd attribute message of the session description protocol.
  • the present invention also provides a method of negotiating data signal detector capabilities for use in packet network data services, including the following steps:
  • the sender gateway sends the first signaling including the data signal detector support capability message when the voiceband data is transmitted;
  • the sender gateway receives, by the receiving gateway, the sender gateway, according to the received first signaling, whether the sender gateway sends data according to a data signal detector, and if so, determining to start the non-voice decoder to decode the mute packet; otherwise, determining not to start the non-initiation
  • the voice decoder decodes the mute packet.
  • the embodiment of the present invention further provides a sender gateway having a capability of negotiating a data signal detector, which is applied to a packet network fax service, including a data signal detector, and a first sending device, configured to be at the sender gateway With data transmission, the first signaling containing the data signal detector support capability message is sent.
  • the method further includes: when the receiving gateway determines to start the non-voice decoder to decode the mute packet, when the receiving gateway cannot start the non-speech decoder, the feedback includes The data signal detector supports the second signaling of the capability message.
  • the embodiment of the present invention further provides a receiver gateway having a capability of negotiating a data signal detector, which is applied to a packet network fax service, including a non-voice decoder, and a first receiving device, configured to receive the first a signalling
  • the receiving gateway identifies, according to the first signaling received by the first receiving device, whether the sending gateway sends data according to a data signal detector, and if so, determines to start a non-voice decoder to mute the packet. Decode; otherwise it is decided not to start the non-voice decoder to decode the mute packet.
  • the method further includes: when the receiving gateway determines to start the non-voice decoder to decode the mute packet, when the receiving gateway cannot start the non-speech decoder, the feedback includes The data signal detector supports the second signaling of the capability message.
  • the VBD transmission does not have the problem of negotiating the data signal detector capability, so that the data signal detector capability can be negotiated.
  • the network device supports the data detector function, which can reduce the network bandwidth occupied by the voiceband data service, and can greatly reduce the network cost.
  • FIG. 1 is a schematic block diagram of a communication system of the conventional VBD mode described in the background art
  • FIG. 2 is a schematic block diagram of a VBD mode communication system using a data signal detector according to the background art
  • FIG. 3 is a schematic flowchart of a method for implementing a method for negotiating a data signal detector in an embodiment
  • FIG. 4 is a schematic structural diagram of a system for negotiating a data signal detector according to an embodiment
  • FIG. 5 is a schematic diagram of the H248 protocol described in the embodiment.
  • FIG. 6 is a schematic diagram of message interaction for data signal detector capability negotiation using the H248 protocol according to an embodiment
  • FIG. 7 is a schematic structural diagram of a sender gateway having the capability of negotiating a data signal detector according to an embodiment Figure
  • FIG. 8 is a schematic structural diagram of a receiver gateway having the capability of negotiating a data signal detector according to an embodiment
  • the signaling utilizes a message carrying it to be associated with the data signal detector support capability set, thereby enabling the receiving gateway to adjust whether to activate the non-voice decoder to decode the mute packet according to the signaling. .
  • the data signal detector capability is negotiated in a negotiation process applied to a protocol such as H.248, SIP, etc., where dsd (data signal detector) represents a data signal detector in the embodiment of the present invention.
  • the field from ' in the SDP's "gpmd" attribute to include signaling that can negotiate data signal detector capability information, it can be implemented as follows:
  • the first line in the above example indicates that the device supports four payload types 0, 18, 98, and 99, where 0 represents G.711 u law and 18 represents G.729; the second line defines the meaning of dynamic load type 98 as G. .711 A law, sampling rate is 8000Hz; the third line indicates that 98 this type of payload is used in VBD mode, implicitly indicating that VBD capability is supported; the fourth line defines the meaning of dynamic load type 99 as comfort noise. (CN, Comfort Noise, defined in IETF RFC3389), the sampling rate is 8000Hz; The fifth line indicates 99. This payload type is used for the mute packet sent by the data signal detector after the mute is detected in the VBD mode, implicitly indicating that the data signal is supported. Detector capabilities.
  • FIG. 3 is a schematic diagram of a method for implementing the method for negotiating the data signal detector capability. As shown in the figure, the specific implementation includes the following steps:
  • Step 301 The sender gateway sends the first signaling including the data signal detector support capability message during the voiceband data transmission;
  • Step 302 The receiver gateway determines, according to the received first signaling, whether the sender gateway sends data according to the data signal detector, and determines whether to start the non-voice decoder to decode the mute packet.
  • Step 303 When the receiver gateway cannot When the non-voice decoder is activated, the receiving gateway feeds back to the sender gateway a second signaling including a data signal detector support capability message;
  • Step 304 The sender gateway sends data according to the received second signaling manner without the data signal detector.
  • the transmission control protocol uses the H.248 protocol or the SIP protocol, and the principle of transmitting and receiving the first signaling and the second signaling in the two protocols is in the embodiment of the present invention.
  • the method and system for negotiating the data signal detector capability are the same, and thus can be implemented in the same manner in the method and system, so the specific implementation of the first signaling and the second signaling transmission and reception will be After the specific implementation of the system is explained, it is uniformly explained.
  • FIG. 4 is a schematic diagram of a system structure for negotiating the capability of the data signal detector.
  • the system includes a sender gateway 401.
  • the receiver gateway 402 the following describes the positional relationship and connection relationship of each device in the system as follows:
  • the sender gateway 401 includes a data signal detector 4011, and the first transmitting device 403 and the second receiving device 404 are respectively connected to the sender gateway 401;
  • the receiver gateway 402 includes a non-voice decoder 4021, and the first receiving device 405 and the second transmitting device 406 are respectively connected to the receiver gateway 402.
  • the first sending device 403 sends the first signaling including the data signal detector support capability message when the sender gateway 401 plays the data transmission; the first receiving device 405 receives the first signaling; the receiving gateway 402 Based on the first signaling received by the first receiving device 405, it is determined whether the transmitting gateway 401 transmits data according to the data signal detector 4011, and then determines whether to activate the non-voice decoder 4021 to decode the mute packet.
  • the second transmitting device 406 feeds back the second signaling including the data signal detector support capability message when the receiver gateway 402 cannot start the non-voice decoder 4021; the second receiving device 404 receives the second signaling; the sender gateway 401 is The second signaling received by the second receiving device 404 transmits the data in a manner that does not include the data signal detector 4011.
  • the transmission control protocol uses the H.248 protocol or the SIP protocol when transmitting in the VBD mode, the following describes how to implement the two protocols.
  • the media control device and the media processing device interact with each other through the H.248 protocol, and the LOCAL and REMOTE descriptors in the H.248 protocol can be utilized to achieve the information about the capability of the data signal detector in the signaling, that is, It carries the data signal detector capability described using the extended SDP.
  • the signal signal detector capability parameter does not appear in the signaling in the SDP, it indicates that the data signal detection function is not supported.
  • FIG. 5 is a schematic flowchart of data signal detector capability negotiation under the H248 protocol, as shown in the figure, including the following steps:
  • Step 501 The media control device requests the first media processing device to provide a supported capability set, where the data signal detector capability is included.
  • Step 502 The first media processing device provides the media control device with a supported capability set, including whether the data signal detector capability is supported, and returned to the media control device.
  • Step 503 The media control device sends the capability set provided by the first media processing device to the second media processing device, and requests the media processing device to second select the capability supported therein.
  • Step 504 The second media processing device selects the supported capability and returns to the media control device.
  • Step 505 The media control device instructs the first media processing device to use the second media processing device to select Fixed ability
  • Step 506 The first media processing device accepts the selected capability.
  • the first media processing device refers to the sender gateway device
  • the second media processing device refers to the receiver gateway
  • the media control device refers to a device that specifically controls the media processing device.
  • Step 601 media control device - first media processing device:
  • Step 602 The first media processing device-media control device: PT/CN2007/002816
  • the first media processing device carries the supported capability set in the Local descriptor, including the ability to perform speech coding with G.729 or G.711 u-law, VBD capability and support for data signal detector capability, return Give the media control device.
  • Step 603 media control device ⁇ second media processing device: '
  • the media control device carries the capability set supported by the first media processing device in the Local and the Remote Descriptor, and sends the capability set provided by the first media processing device to the second media processing device, requesting the second media processing device to select the capability supported therein.
  • Step 604 the second media processing device ⁇ media control device:
  • the second media processing device carries the selected capabilities in the Local Descriptor, including the ability to perform speech coding with G.729, VBD capabilities, and data signal detector capabilities, and returns to the media control device. Ready.
  • Step 605 media control device, first media processing device:
  • the media control device instructs the first media processing device to use the capabilities selected by the second media processing device to carry the selected capabilities in the Local and Remote descriptors that sent the message.
  • Step 606 the first media processing device - the media control device:
  • the first media processing device accepts the selected capability and returns a modification success response message.
  • the SIP protocol uses the SDP protocol to describe the media parameters, and the signaling can use the information described above to extend the capabilities of the supported data signal detectors in the SDP for negotiation of data signal detector capabilities.
  • the SIP message requesting initiator sends a request message carrying the capability set supported by it, which may include voice coding capability, VBD capability, and data signal detector capability;
  • the SIP message responding end selects from the received multiplexing capability, returns a response message to the requesting end, and carries the selected voice coding capability, VBD capability and data signal detector capability. If the SIP message answering end does not support the data signal detector capability, it deletes the SDP description line with the data signal detector capability in the reply message.
  • the G.729 or G.711 u-law performs voice coding, VBD capability and data signal detector capability.
  • the SIP message response terminal determines the ability to use G.729 for voice coding, VBD capability and data signal detector capability.
  • the SIP message request originator included in the signaling supports the capability of voice coding with G.729 or G.711 u-law, VBD capability and data signal detector capability, and the SIP message response terminal decides to support G.729 is used for voice coding and VBD capability, but does not support data signal detector capability.
  • the data signal detection function may also be implemented in the following manner:
  • the implementation can be expressed as follows:
  • the media processing device does not support the data signal detection function
  • the embodiment of the invention also provides a sender gateway with the capability of negotiating data signal detectors, which is used for packet network fax services.
  • 7 is a schematic structural diagram of a sender gateway having the capability of negotiating a data signal detector.
  • the sender gateway includes a data signal detector 4011 and a first transmitting device 403, which are used for transmitting data at the sender gateway. Sending a first signaling containing a data signal detector support capability message.
  • the second receiving device 404 is configured to: when the receiving gateway determines to start the non-voice decoder to decode the mute packet, when the receiving gateway cannot start the non-speech decoder, feedback the second message including the data signal detector support capability message make.
  • FIG. 8 is a schematic structural diagram of a receiver gateway having a capability of negotiating a data signal detector, as shown, including a non-voice decoder 4021, and a first receiving device 405, configured to receive first signaling; 07 002816
  • the receiving gateway identifies, according to the first signaling received by the first receiving device 405, whether the sending gateway sends data according to the data signal detector, and if so, determines to start the non-voice decoder to decode the mute packet; otherwise, The mute packet is decoded without starting the non-voice decoder.
  • the second sending device 406 is configured to: when the receiving gateway determines to start the non-voice decoder to decode the mute packet, when the receiving gateway cannot start the non-speech decoder, feed back the second message including the data signal detector support capability message make.

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Description

一种协商数据信号检测器能力的方法及系统、 网关 技术领域
本发明涉及一种协商数据信号检测器能力的方法及系统、 网关, 特别涉 及一种分组网络传真业务中在用话带数据 (VBD, Voice-Band Data )传输时 协商数据信号检测器能力的方法及系统, 具有协商数 信号检测器能力的发 送方网关、 接收方网关。 背景技术
一、 分组网络传真业务实现方式介绍。
21世纪将是信息产业持续快速发展的世纪, 人类进入了网络经济时代。 网络技术的飞速发展, 使得利用分组技术来传输多媒体成为可能并变成现实。 由于不同的通讯网络中传输的媒体流编码方式不同, 因此在不同通讯网络的 结合点需要编解码器进行媒体流编码方式的转换, 实现这种转换的设备我们 称之为网关。
目前网关处理的媒体流主要包括: 语音流、 数据流、 视频流等。 其中的 数据流主要是指传真机、 数字调制解调器(modem )、 文本电话等数据设备在 交互过程中发出的信号。 目前业界通过网关传递数据流的方式主要有: VBD 方式和转发方式。
VBD方式是指通过对信号损伤比较小的编解码方式, 把数据流作为普通 的语音流进行低损的编解码处理, 建议采用的编解码标准是 ITU-T G.711 和 ITU-T G.726o 这种方式的优点是实现简单, 不用关心具体数据信号的含义, 只要把数据信号当作语音进行处理就可以了, 对网关的处理能力消耗非常小; 缺点是占用带宽大, 受互联网协议(IP, Internet Protocol ) 网络波动影响比较 大, 难以抵御 IP网络上出现的丟包和时延变化。 这种方式可以应用在对各种 数据设备数据流的处理。
转发(Relay ) 方式是指通过一些规定了数据信号转换传输方法的协议, 把发送端数据设备发出的数据信号通过解调转化为适合 IP承载网络传输的数 据报文传输到对端网关后, 再通过调制恢复发送给接收端数据设备的方式, 比如 ITU-T T.38中的 Fax Relay方式、 ITU-T V.150.1中的 Modem Relay方式 等。 这种方式的优点是对 IP网上出现各种损伤的抵御能力比较强, 较大提高 了数据业务的成功率和稳定性; 缺点是实现比较复杂, 对网关的处理能力消 耗比较大。
随着数据业务的不断发展, 数据业务的种类层出不穷, VBD方式以其实 现简单、 应用范围宽的特点, 越来越受到大家的重视。 随之而来的就是对其 应用优化的研究, 比如根据 IETF RFC2198协议实现对实时传输协议 ( RTP, Real-time Transport Protocol )报文的冗余处理、 在报文接收方实现静态抖动消 除緩冲区(JB, Jitter Buffer )等方法, VBD方式抵御 IP网络上出现的丢包和 时延变化的能力已经显著提高。
但是 VBD 方式占用带宽大的问题却一直没有得到 4艮好的解决。 以采用 G.711协议规定的编解码方式为例, 在没有采用 RFC2198 冗余的情况下, 数 据载荷占用帶宽为 64k bit/s, 冗余 1帧时占用带宽为 128k bit/s, 冗余 2帧时 占用带宽高达 192k bit/s , 这对于很多带宽有限的应用场合是难以接受的。
二、 数据信号检测器功能介绍。
传统的 VBD方式,将数据设备发出的数据信号全部作为话音信号输入话 音编码器进行低损的编解码处理,图 1为传统 VBD方式的通信系统原理框图, 其原理如图所示为: 发送方网关在数据信号通过话音编码器后, 通过通信通 道传输至接收方网关, 接收方网关通过话音解码器后输出重构数据信号。
但是在很多数据业务过程中, 有很多时间数据设备发出的只是静音, 而 不是有效的数据信号。比如现在应用最广泛的支持最高速率为 14400bit/s的传 真机, 其采用的传真过程是半双工的, 也就是说整个传真过程有 50%以上的 时间传真机发出的信号为静音。
根据上述情况有人提出,在采用 VBD方式的系统中使用数据信号检测器, 将数据设备发出的有效数据信号和静音区分开, 送入不同的编码器进行编码, 图 2为采用数据信号检测器的 VBD方式通信系统原理框图,其原理如图所示。 系统中包括 3 个模块: 发送方网关、 通信信道和接收方网关。 发送方网 关中有数据信号检测器、 低损的话音编码器和非话音编码器, 接收方网关中 有话音解码器和非话音解码器, 通信信道一般为 IP网络。
数据信号进入发送方网关后, 首先被分成等间隔的信号帧, 帧长根据编 码器采用的编码协议而定, 一般在 5〜30毫秒之间。 而后数据信号检测器对每 一个输入的信号帧进行分析, 根据是否携带有效数据信号, 将信号帧分为数 据信号帧和非数据信号帧。 若输入信号帧为数据信号帧, 则数据信号检测器 控制该信号帧进入话音编码器进行低损的话音编码, 否则, 数据信号检测器 控制该信号帧进入非话音编码器进行静音压缩编码。 话音编码器输出的信息 被称为语音包, 非话音编码器输出的信息被称为静音包, 静音包中的信息只 用来恢复静音, 所以码率非常低, 不到语音包码率的十分之一。
接收方网关收到语音包后, 送进话音解码器进行话音解码后输出有效数 据信号, 收到静音包后送入非话音解码器重构静音信号。
所以通过数据信号检测器将信号帧分为数据信号帧和非数据信号(静音 ·) 帧, 并对这些帧采取不同编码方式, 在非有效数据信号期间只发送少量的静 音信息, 相对于所有信号帧不加分辨地都送入话音编码器而言, 大大降低了 输出码率。
三、 控制协议介绍。
H.248 协议是国际电信联盟-电信标准化部 ( ITU-T , International
Telecommunications Union - Telecommunication Standardization Sector )制定的, 专门用于媒体资源控制的协议, 可用于控制媒体网关、 媒体服务器等媒体处 理设备。 该协议的基本原理是: 把媒体处理设备上的各种资源被抽象为端点, 终端又分为物理端点和临时端点。 物理端点代表一些具有半永久存在性的物 理实体, 如时分复用 (TDM, Time Division Multiplex ) 时隙; 临时端点代表 临时申请使用后释放的公共资源, 如 RTP流。 端点之间的组合被抽象为上下 文, 用拓朴来描述端点之间的关系。 基于这些抽象, 呼叫接续实际上是对端 T/CN2007/002816 点和上下文的操作, 通过媒体控制设备和媒体处理设备之间的命令请求和响 应来完成, 命令包括增加、 修改、 删除、 通知等; 命令参数称为描述符, 分 类为属性(Property ), 信号 ( Signal )、 事件 ( Event )、 统计 ( Statistic )。
会话初始协议 (SIP, Session Initiation Protocol ) 是互联网工程任务組 ( IETF, Internet Engineering Task Force ) 制订的, 用于多方多媒体通信。 按 照 IETF RFC3261协议的定义, SIP是一个基于文本的应用层控制协议, 独立 于底层传输协议, 用于建立、 修改和终止 IP网上的双方或多方多媒体会话。 SIP协议支持代理、 重定向及登记定位用户等功能。 通过与相关协议的配合, SIP还可以支持语音、 视频、 数据、 电子邮件、 网上聊天、 游戏等功能。
会话描述协议(SDP, Session Description Protocol )是 IETF制订的, 用 于在媒体会话中传递媒体流信息。 SDP 定义了会话描述的统一格式, 包括以 下一些方面:
1 )会话的名称和目的;
2 )会话存活时间;
3 ) 包含在会话中的媒体信息, 包括: 媒体类型 (例如视频、 语音等)、 传输协议(例如 RTP UDP/IP、 H.320等)、 媒体格式 (例如 H.263、 G711等)、 多播或远端 (单播)地址和端口;
4 )接收媒体需要的信息 (地址、 端口、 格式等等);
5 )使用的带宽信息;
6 )可信赖的接洽信息 ( Contact information )0
SIP、 H.248等协议都釆用 SDP的方式来描述媒体资源属性。
因为数据信号检测器应用在 VBD模式下, 下面是现有技术中协商 VBD 能力时对 SDP的扩展。
根据 ITU-T V.152协议的规定,协商 VBD能力时,需要在 SDP的 "gpmd" ( general-purpose media descriptor ) 属性中 4广展 "vbd=yes" 字段, 举例如下: m=audio 3456 RTP/AVP 0 18 98
a=rtpmap:98 PCMA/8000 a=gpmd:98 vbd=yes
第一行中的 0、 18和 98都是 RTP包的载荷类型。 根据 IETF RFC3551协 议规定,载荷类型在 96以下的为静态负载类型,其含义是固定的,在 RFC3551 中有定义; 载荷类型在 96~127之间的为动态载荷类型, 其含义需要在使用时 临时定义。所以上面例子中第一行表示此设备支持 0、 18和 98三种载荷类型, 其中 0表示 G.711 u律, 18表示 G.729; 第二行定义了动态载荷类型 98的含 义为 G.711 A律, 采样率为 8000Hz; 第三行表示 98这种载荷类型用于 VBD 方式, 隐含表示支持 VBD能力。
但现有技术的不足在于不能实现数据信号检测器能力的协商。 发明内容
本发明实施例提供一种协商数据信号检测器能力的方法及系统、 具备协 商数据信号检测器能力的发送方网关、 接收方网关, 用以解决现有技术中存 在的在分组网络传真业务中,用 VBD传输时没有协商数据信号检测器能力的 问题。
本发明实施例中协商数据信号检测器能力的方法包括如下步骤: 发送方网关在话带数据传输时, 发送含数据信号检测器支持能力消息的 第一信令;
接收方网关根据接收到的所述第一信令识别所述发送方网关是否按含数 据信号检测器方式发送数据, 若是, 则决定启动非话音解码器对静音包进行 解码; 否则决定不启动非话音解码器对静音包进行解码。
较佳地, 进一步包括如下步骤:
当所述接收方网关不能启动所述非话音解码器时, 所述接收方网关向所 述发送方网关反馈含数据信号检测器支持能力消息的第二信令;
所述发送方网关根据接收到的所述第二信令按不含数据信号检测器的方 式发送数据。
较佳地, 所述发送方网关与接收方网关以 H.248协议进行数据信号检测 器能力协商, 所述接收方网关通过第二媒体处理设备与媒体控制设备反馈所 述第二信令, 发送方网关通过所述媒体控制设备与第一媒体处理设备接收所 述第二信令。
较佳地, 所述发送方网关与接收方网关以会话初始协议进行数据信号检 测器能力协商, 所述接收方网关通过会话初始协议消息请求发起端发送所述 第二信令, 发送方网关通过所述会话初始协议消息应答端接收所述第二信令。
较佳地, 所述发送方网关与接收方网关以 H.248协议进行数据信号检测 器能力协商, 所述发送方网关通过第一媒体处理设备与媒体控制设备发送所 述第一信令, 接收方网关通过所述媒体控制设备与第二媒体处理设备接收所 述第一信令。
较佳地, 所述发送方网关与接收方网关以会话初始协议进行数据信号检 测器能力协商, 所述发送方网关通过会话初始协议消息请求发起端发送所述 第一信令, 接收方网关通过所述会话初始协议消息应答端接收所述第一信令。
较佳地, 所述第一信令是按会话描述协议发送的。
较佳地,所述第一信令是在根据 ITU-T V.152协议协商话带数据信号检测 器能力时, 按会话描述协议发送的。
较佳地, 所述第一信令是在携带会话描述协议的 gpmd属性消息后发送 的。
较佳地, 所述第二信令是按会话描述协议发送的。
较佳地,所述第二信令是在根据 ITU-T V.152协议协商话带数据信号检测 器能力时, 按会话描述协议发送的。
较佳地, 所述第二信令是在携带会话描述协议的 gpmd属性信息后发送 的。
本发明实施例还提供了一种协商数据信号检测器能力的系统, 运用于分 组网络传真业务, 包括发送方网关、 接收方网关、 所述发送方网关包括数据 信号检测器、 所述接收方网关包括非话音解码器, 还包括与发送方网关相连 的第一发送装置、 与接收方网关相连的第一接收装置, 其中: 第一发送装置, 用于在所述发送方网关话带数据传输时, 发送含数据信 号检测器支持能力消息的第一信令;
第一接收装置, 用于接收所述第一信令;
所述接收方网关根据所述第一接收装置接收到的所述第一信令识别所述 发送方网关是否按含数据信号检测器方式发送数据, 若是, 则决定启动非话 音解码器对静音包进行解码; 否则决定不启动非话音解码器对静音包进行解 码。
较佳地, 进一步包括与所述接收方网关相连的第二发送装置、 与所述发 送方网关相连的第二接收装置, 其中:
第二发送装置, 用于当所述接收方网关不能启动所述非话音解码器时, 反馈含数据信号检测器支持能力消息的第二信令;
第二接收装置, 用于接收所述第二信令;
所述发送方网关根据所述第二接收装置接收到的所述第二信令按不含数 据信号检测器的方式发送数据。
较佳地, 当所述发送方网关与接收方网关以 H.248协议进行数据信号检 测器能力协商时, 所述第二发送装置与第二接收装置通过媒体处理设备与媒 体控制设备发送与接收第二信令。
较佳地, 当所述发送方网关与接收方网关以会话初始协议进行数据信号 检测器能力协商时, 所述第二发送装置通过会话初始协议消息请求发起端发 送所述第二信令, 所述第二接收装置通过所述会话初始协议消息应答端接收 所述第二信令。
较佳地, 当所述发送方网关与接收方网关以 H.248协议进行数据信号检 测器能力协商时, 所述第一发送装置与第一接收装置通过媒体处理设备与媒 体控制设备发送与接收所述第一信令。
较佳地, 当所述发送方网关与接收方网关以会话初始协议进行数据信号 检测器能力协商时, 所述第一发送装置通过会话初始协议消息请求发起端发 送所述第一信令, 所述第一接收装置通过所述会话初始协议消息应答端接收 所述第一信令。
较佳地, 所述第一发送装置、 第一接收装置按会话描述协议发送、 接收 所述第一信令。
较佳地, 所述第一发送装置、 第一接收装置, 在根据 ITU-T V.152协议协 商话带数据信号检测器能力时, 按会话描述协议发送、 接收所述第一信令。
较佳地, 所述第一发送装置, 在所述第一信令携带会话描述协议的 gpmd 属性消息后发送。
较佳地, 所述第二发送装置、 第二接收装置按会话描述协议发送所述第 二信令。
较佳地, 所述第二发送装置、 第二接收装置, 在根据 ITU-T V.152协议协 商话带数据信号检测器能力时, 按会话描述协议发送、 接收所述第二信令。
较佳地, 所述第二发送装置, 在所述第二信令携带会话描述协议的 gpmd 属性消息后发送。
本发明还提供了一种协商数据信号检测器能力的方法, 运用于分组网络 数据业务, 包括如下步骤:
发送方网关在话带数据传输时, 发送含数据信号检测器支持能力消息的 第一信令;
接收方网关根据接收到的所述第一信令识别所述发送方网关是否按含数 据信号检测器方式发送数据, 若是, 则决定启动非话音解码器对静音包进行 解码; 否则决定不启动非话音解码器对静音包进行解码。
本发明实施例还提供了一种具备协商数据信号检测器能力的发送方网 关, 运用于分组网络传真业务, 包括数据信号检测器, 还包括第一发送装置, 用于在所述发送方网关话带数据传输时, 发送含数据信号检测器支持能力消 息的第一信令。
较佳地, 进一步包括第二接收装置, 用于若所述接收方网关决定启动非 话音解码器对静音包进行解码时, 当所述接收方网关不能启动所述非话音解 码器时, 反馈含数据信号检测器支持能力消息的第二信令。 N2007/002816J ^ 本发明实施例还提供了一种具备协商数据信号检测器能力的接收方网 关, 运用于分组网络传真业务, 包括非话音解码器, 还包括第一接收装置, 用于接收第一信令;
所述接收方网关根据所述第一接收装置接收到的所述第一信令识别所述 发送方网关是否按含数据信号检测器方式发送数据, 若是, 则决定启动非话 音解码器对静音包进行解码; 否则决定不启动非话音解码器对静音包进行解 码。
较佳地, 进一步包括第二发送装置, 用于若所述接收方网关决定启动非 话音解码器对静音包进行解码时, 当所述接收方网关不能启动所述非话音解 码器时, 反馈含数据信号检测器支持能力消息的第二信令。
本发明实施例有益效果如下:
VBD传输时没有协商数据信号检测器能力的问题, 从而可以进行数据信号检 测器能力的协商。 网络设备支持数据检测器功能, 可以降低话带数据业务占 用的网络带宽, 可以大大降低网络成本。 附图说明
图 1为背景技术中所述传统 VBD方式的通信系统原理框图;
图 2为背景技术中所述采用数据信号检测器的 VBD方式通信系统原理框 图;
图 3为实施例中所述协商数据信号检测器能力的方法实施流程示意图; 图 4为实施例中所述协商数据信号检测器能力的系统结构示意图; 图 5为实施例中所述在 H248协议下进行数据信号检测器能力协商的流程 示意图;
图 6为实施例所述使用 H248协议进行数据信号检测器能力协商的消息交 互示意图;
图 7 为实施例所述具备协商数据信号检测器能力的发送方网关结构示意 图;
图 8为实施例所述具备协商数据信号检测器能力的接收方网关结构示意
具体实施方式
下面结合附图对本发明的具体实施方式进行说明。
本发明实施例利用分组网络传真业务中在 VBD 模式传输下, 在根据 ITU-T V.152 协议的规定协商 VBD 能力时, 需要在 SDP 的 " gpmd " ( general-purpose media descriptor )属性中扩展 "vbd=yes" 的情况下, 信令利 用携带它将与数据信号检测器支持能力集有关的消息发送出去, 从而使得接 收端网关能够依据该信令调整是否启动非话音解码器对静音包进行解码。
具体实施中, 通过对含有 SDP的 "gpmd" 属性的信令扩展从而包含用于 数据信号检测器能力的协商的 "dsd=yes" 这样的信息, 这样本发明实施例的 信令就可以将其应用到 H.248、 SIP等协议的协商流程中实现了对数据信号检 测器能力进行协商, 其中 dsd ( data signal detector )表示本发明实施例中的数 据信号检测器。
通过在 SDP的 "gpmd"属性中扩展 "dsd=yes,, 字段从 '而包含可以协商数 据信号检测器能力信息的信令, 可以以如下方式来实现:
m=audio 3456 RTP/AVP 0 18 98 99
a=rtpmap:98 PCMA/8000
a=gpmd:98 vbd=yes
a-rtpmap:99 CN/8000
a=gpmd:99 dsd=yes
上面例子中第一行表示此设备支持 0、 18、 98和 99四种载荷类型, 其中 0表示 G.711 u律, 18表示 G.729; 第二行定义了动态载荷类型 98的含义为 G.711 A律, 采样率为 8000Hz; 第三行表示 98这种载荷类型用于 VBD方式, 隐含表示支持 VBD能力; 第四行定义了动态载荷类型 99的含义为舒适噪声 ( CN, Comfort Noise, 在 IETF RFC3389中定义), 采样率为 8000Hz; 第五 行表示 99这种载荷类型用于 VBD方式下数据信号检测器检测到静音后发出 的静音包, 隐含表示支持数据信号检测器能力。
本发明实施例还提供了一种协商数据信号检测器能力的方法, 图 3 为协 商数据信号检测器能力的方法实施流程示意图, 如图所示, 具体实施时包括 如下步骤:
步骤 301、发送方网关在话带数据传输时, 发送含数据信号检测器支持能 力消息的第一信令;
步骤 302、接收方网关根据接收到的第一信令识别发送方网关是否按含数 据信号检测器发送数据后, 决定是否启动非话音解码器对静音包进行解码; 步骤 303、 当接收方网关不能启动非话音解码器时,接收方网关向发送方 网关反馈含数据信号检测器支持能力消息的第二信令;
步骤 304、发送方网关根据接收到的第二信令按不含数据信号检测器的方 式发送数据。
在用 VBD方式进行传输时, 传输控制协议采用的是 H.248协议或 SIP协 议, 而对于在这两种协议下第一信令与第二信令的发送、 接收原理, 在本发 明实施例所提供的协商数据信号检测器能力的方法与系统都是一样的, 因而 也可以以同样的方式在方法与系统中进行实施, 因此对于第一信令与第二信 令发送接收的具体实施将在对系统的具体实施进行说明后统一说明。
根据上述与方法相同的实施, 本发明实施例还提供了协商数据信号检测 器能力的系统, 图 4 为协商数据信号检测器能力的系统结构示意图, 如图所 示, 系统中包括发送方网关 401、 接收方网关 402, 下面对本系统中各装置的 位置关系、 连接关系进行说明如下:
在发送方网关 401 中含有数据信号检测器 4011 , 第一发送装置 403、 第 二接收装置 404分别与发送方网关 401相连;
接收方网关 402中含有非话音解码器 4021 , 第一接收装置 405、 第二发 送装置 406分别与接收方网关 402相连。 具体实施中, 第一发送装置 403在发送方网关 401话带数据传输时, 发 送含数据信号检测器支持能力消息的第一信令; 第一接收装置 405接收第一 信令; 接收方网关 402根据第一接收装置 405接收到的第一信令识别发送方 网关 401是否按含数据信号检测器 4011发送数据后, 决定是否启动非话音解 码器 4021对静音包进行解码。
第二发送装置 406当接收方网关 402不能启动非话音解码器 4021时, 反 馈含数据信号检测器支持能力消息的第二信令; 第二接收装置 404接收第二 信令; 发送方网关 401根据第二接收装置 404接收到的第二信令按不含数据 信号检测器 4011的方式发送数据。
由于在用 VBD方式进行传输时,传输控制协议采用的是 H.248协议或 SIP 协议 , 因此下面分别介绍在这两种协议下如何实现。
一、 在 H.248协议进行数据信号检测器能力协商的具体实施。
媒体控制设备和媒体处理设备之间通过 H.248协议进行交互, 可以利用' H.248协议中的 LOCAL和 REMOTE描述符来达到使信令中包含有关数据信 号检测器能力的信息, 也就是在其中携带使用扩展后 SDP描述的数据信号检 测器能力。 当 SDP中的信令没有出现数据信号检测器能力参数的时候表示不 支持数据信号检测功能。
图 5为在 H248协议下进行数据信号检测器能力协商的流程示意图,如图 所示, 包括以下步骤:
步骤 501、媒体控制设备请求第一媒体处理设备提供支持的能力集, 其中 包括数据信号检测器能力。
步骤 502、 第一媒体处理设备给媒体控制设备提供支持的能力集, 其中包 括是否支持数据信号检测器能力, 返回给媒体控制设备。
步骤 503、媒体控制设备将第一媒体处理设备提供的能力集发送给第二媒 体处理设备, 请求媒体处理设备第二选择其中支持的能力。
步骤 504、 第二媒体处理设备选择支持的能力, 返回给媒体控制设备。 步骤 505、媒体控制设备指示第一媒体处理设备使用第二媒体处理设备选 定的能力;
步骤 506、 第一媒体处理设备接受选定的能力。
其中, 第一媒体处理设备是指发送方网关设备, 第二媒体处理设备是指 接收方网关, 媒体控制设备是指专门对媒体处理设备进行控制的设备。
图 6为使用 H248协议进行数据信号检测器能力协商的消息交互示意图, 图中是在发送的信令中包含了数据信号检测器能力的消息交互过程示意, 具 体实施中, 消息使用文本编解码方式进行描述, 消息交互如下图所示为: 步骤 601、 媒体控制设备-第一媒体处理设备:
添加 IP端点, 在 Local描述符中携带复用参数, 取值为 $, 要求第一媒体 处理设备在应答消息中返回它支持的能力集。
MEGACO/1.0 [123.123.123.4]:55555
Transaction = 11 {
Context = $ {
Add = $ {
Media {
Stream = 1 {
LocalControl { Mode = ReceiveOnly, ReserveGroup = True, Reserve Value = True},
Local {
v=0
c=IN IP4 $
m=audio $ RTP/AVP 18 0 $
}
}
}
}
}
}
步骤 602、 第一媒体处理设备—媒体控制设备: P T/CN2007/002816 第一媒体处理设备在 Local 描述符中携带支持的能力集, 其中包括用 G.729或者 G.711 u律进行语音编码的能力、 VBD能力和支持数据信号检测器 能力, 返回给媒体控制设备。
MEGACO/1.0 [124.124.124.5]:66666
Transaction = 11 {
Context = 40000 {
Add = A4445 {
Media {
Stream = 1 {
LocalControl { Mode = ReceiveOnly, ReserveGroup = True, Reserve Value = True},
Local {
v=0
c=IN IP4 124.124.124.111
m=audio 2222 RTP/AVP 18 0 98 99
a=rtpmap:98 PCMU/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=yes
}
}
}
}
}
}
步骤 603、 媒体控制设备→第二媒体处理设备: '
媒体控制设备在 Local和 Remote描述符中携带第一媒体处理设备支持的 能力集, 将第一媒体处理设备提供的能力集发送给第二媒体处理设备, 请求 第二媒体处理设备选择其中支持的能力。 MEGACO/1.0 [123.123.123.4]:55555
Transaction = 12 {
Context = $ {
Add = $ {
Media {
Stream = 1 {
LocalControl { Mode = ReceiveOnly, ReserveGroup True, Reserve Value = True},
Local {
v=0
c=IN IP4 $
m=audio $ RTP/AVP 18 0 $
Romote {
v=0
c=IN IP4 124.124.124.111
m=audio 11 11 RTP/AVP 18 0 98 99
a=rtpmap:98 PCMU/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=yes
}
}
步骤 604、 第二媒体处理设备→媒体控制设备:
第二媒体处理设备在 Local描述符中携带选定的能力, 其中包括用 G.729 进行语音编码的能力、 VBD能力和数据信号检测器能力, 返回给媒体控制设 备。
MEGACO/1.0 [125.125.125.6]:77777
Transaction = 12 {
Context = 50000 {
Add = A5556 {
Media {
Stream = 1 {
LocalControl { Mode = ReceiveOnly, ReserveGroup = True, Reserve Value = True},
Local {
v=0
c=IN IP4 125.125.125.222
m=audio 2222 RTP/AVP 18 98 99
a=rtpmap:98 PCMU/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=yes
}
}
}
} '
}
}
步骤 605、 媒体控制设备 第一媒体处理设备:
媒体控制设备指示第一媒体处理设备使用第二媒体处理设备选定的能 力, 在发送消息的 Local和 Remote描述符中携带选定的能力。
MEGACO/1.0 [123.123.123.4]:55555
Transaction = 13 {
Context = 40000 { 7 002816
Modify = A4445 {
Media {
Stream = 1 {
LocalControl { Mode = ReceiveOnly, ReserveGroup = True, Reserve Value True},
Local {
v=0
c=IN IP4 124.124.124.111
m^audio 1111 RTP/AVP 18 98 99
a=rtpmap:98 PCMU/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=yes
}
Remote {
v=0
c=IN IP4 125.125.125.222
m=audio 2222 RTP/AVP 18 98 99
a=rtpmap:98 PCMU/8000
a=gpmd:98 vbd^yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=yes
}
}
步骤 606、 第一媒体处理设备 -媒体控制设备:
第一媒体处理设备接受选定的能力, 返回修改成功应答消息, MEGACO/1 [124.124.124.555]:66666
Reply = 13 {
Context = 40000 {Modify = A4445}
}
二、 在 SIP协议进行数据信号检测器能力协商的具体实施。
SIP协议使用 SDP协议描述媒体参数, 信令可以使用包含上面描述的在 SDP 中扩展支持数据信号检测器能力的信息来进行数据信号检测器能力的协 商。
1、 SIP 消息请求发起端发送请求消息, 携带它支持的能力集, 其中可以 包括语音编码的能力、 VBD能力和数据信号检测器能力;
2、 SIP 消息应答端从接收的复用能力集中进行选择, 给请求端回应答消 息, 携带选定的语音编码能力、 VBD能力和数据信号检测器能力。 如果 SIP 消息应答端不支持数据信号检测器能力, 那么它就在应答消息中删除带有数 据信号检测器能力的 SDP描述行。
下面是协商成功的具体实施例: 信令包含的 SIP 消息请求发起端支持用
G.729或者 G.711 u律进行语音编码的能力、 VBD能力和数据信号检测器能力, SIP消息应答端决定支持用 G.729进行语音编码的能力、 VBD能力和数据信 号检测器能力。
SIP Request:
m=audio 12345 RTP/AVP 18 0 98 99
a=rtpmap:98 PCMU/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=yes
SIP Response:
m=audio 23456 RTP/AVP 18 98 99
a=rtpmap:98 PCMU/8000 a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=yes
下面是协商失败的实施例: 信令中包含的 SIP 消息请求发起端支持用 G.729或者 G.711 u律进行语音编码的能力、 VBD能力和数据信号检测器能力, SIP消息应答端决定支持用 G.729进行语音编码的能力和 VBD能力, 但不支 持数据信号检测器能力。
SIP Request:
m=audio 12345 RTP/AVP 18 0 98 99
a=rtpmap:98 PCMU/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=yes SIP Response:
m=audio 23456 RTP/AVP 18 98 99
a=rtpmap:98 PCMU/8000
a=gpmd:98 vbd=yes
根据同样的构思, 在信令所包含的消息中, 也可以将不支持数据信号检 测功能时用以下方式实现:
当媒体处理设备不支持数据信号检测功能时, 除了在 SDP中去掉数据信 号检测器能力的相关描述之外, 在应答消息中 SDP 的 "gpmd" 属性中扩展 "dsd=no" 字段。 实施中可以按如下表示:
m=audio 3456 RTP/AVP 18 98 99
a=rtpmap:98 PCMA/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 dsd=no
实施时, 信令还可以使用现有 SDP属性的组合信息, 例如: 使用 SDP属性中 "CN/8000" 和 "vbd=yes" 字段的组合, 用于数据信号 检测器能力的协商, 并将其应用到 H.248、 SIP等协议的协商流程中。 举例如 下:
m=audio 3456 RTP/AVP 0 18 98 99
a=rtpmap:98 PCMA/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 vbd=yes
相应地, 当媒体处理设备不支持数据信号检测功能时, 除了在 SDP中去 掉数据信号检测器能力的相关描述之外, 还可以在应答消息中使用 SDP属性 中 "CN/8000" 和 "vbd=no" 字段的组合。 举例如下:
m=audio 3456 RTP/AVP 18 98 99
a=rtpmap:98 PCMA/8000
a=gpmd:98 vbd=yes
a=rtpmap:99 CN/8000
a=gpmd:99 vbd=no
本发明实施例还提供了一种具备协商数据信号检测器能力的发送方网 关, 运用于分组网络传真业务。 图 7为具备协商数据信号检测器能力的发送 方网关结构示意图, 如图所示, 发送方网关中包括数据信号检测器 4011、 第 一发送装置 403, 用于在发送方网关话带数据传输时,发送含数据信号检测器 支持能力消息的第一信令。
第二接收装置 404,用于若接收方网关决定启动非话音解码器对静音包进 行解码时, 当接收方网关不能启动非话音解码器时, 反馈含数据信号检测器 支持能力消息的第二信令。
本发明实施例还提供了一种具备协商数据信号检测器能力的接收方网 关, 运用于分组网络传真业务。 图 8 为具备协商数据信号检测器能力的接收 方网关结构示意图, 如图所示, 包括非话音解码器 4021、 第一接收装置 405, 用于接收第一信令; 07 002816 接收方网关根据第一接收装置 405接收到的第一信令识别发送方网关是 否按含数据信号检测器方式发送数据, 若是, 则决定启动非话音解码器对静 音包进行解码; 否则决定不启动非话音解码器对静音包进行解码。
第二发送装置 406,用于若接收方网关决定启动非话音解码器对静音包进 行解码时, 当接收方网关不能启动非话音解码器时, 反馈含数据信号检测器 支持能力消息的第二信令。
显然, 当数据流中如数字调制解调器、 文本电话等数据设备在交互过程 中发出的其他数据业务与传真业务工作机理一致时, 本领域的技术人员可以 对本发明实施例进行各种改动和变型, 在不脱离本发明实施例的精神和范围 时, 也可将本发明运用于数据业务中。 这样, 倘若对本发明实施例的这些修 改和变型属于本发明权利要求及其等同技术的范围之内, 则本发明实施例也 意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种协商数据信号检测器能力的方法, 运用于分组网络传真业务, 其 特征在于, 包括如下步骤:
发送方网关在话带数据传输时, 发送含数据信号检测器支持能力消息的 第一信令;
接收方网关根据接收到的所述第一信令识别所述发送方网关是否按含数 据信号检测器方式发送数据, 若是, 则决定启动非话音解码器对静音包进行 解码; 否则决定不启动非话音解码器对静音包进行解码。
2、 如权利要求 1所述的方法, 其特征在于, 所述若是, 则决定启动非话 音解码器对静音包进行解码步骤中, 进一步包括如下步骤:
当所述接收方网关不能启动所述非话音解码器时, 所述接收方网关向所 述发送方网关反馈含数据信号检测器支持能力消息的第二信令;
所述发送方网关根据接收到的所述第二信令按不含数据信号检测器的方 式发送数据。
3、 如权利要求 2所述的方法, 其特征在于, 所述发送方网关与接收方网 关以 H.248协议进行数据信号检测器能力协商, 所述接收方网关通过第二媒 体处理设备与媒体控制设备反馈所述第二信令, 发送方网关通过所述媒体控 制设备与第一媒体处理设备接收所述第二信令。
4、 如权利要求 2所述的方法, 其特征在于, 所述发送方网关与接收方网 关以会话初始协议进行数据信号检测器能力协商, 所述接收方网关通过会话 初始协议消息请求发起端发送所述第二信令, 发送方网关通过所述会话初始 协议消息应答端接收所述第二信令。
5、 如权利要求 1所述的方法, 其特征在于, 所述发送方网关与接收方网 关以 H.248协议进行数据信号检测器能力协商, 所述发送方网关通过第一媒 体处理设备与媒体控制设备发送所述第一信令, 接收方网关通过所述媒体控 制设备与第二媒体处理设备接收所述第一信令。
6、 如权利要求 1所述的方法, 其特征在于, 所述发送方网关与接收方网 关以会话初始协议进行数据信号检测器能力协商, 所述发送方网关通过会话 初始协议消息请求发起端发送所述第一信令, 接收方网关通过所述会话初始 协议消息应答端接收所述第一信令。
7、 如权利要求 1或 5或 6所述的方法, 其特征在于, 所述第一信令是在 根据 ITU-T V.152协议协商话带数据信号检测器能力时,按会话描述协议发送 的。
8、 如权利要求 7所述的方法, 其特征在于, 所述第一信令是在携带会话 描述协议的 gpmd属性消息后发送的。
9、 如权利要求 2或 3或 4所述的方法, 其特征在于, 所述第二信令是在 根据 ITU-T V.152协议协商话带数据信号检测器能力时,按会话描述协议发送 的。
10、 如权利要求 9所述的方法, 其特征在于, 所述第二信令是在携带会 话描述协议的 gpmd属性信息后发送的。
11、 一种协商数据信号检测器能力的系统, 运用于分组网络传真业务, 包括发送方网关、 接收方网关、 所述发送方网关包括数据信号检测器、 所述 接收方网关包括非话音解码器, 其特征在于, 还包括与发送方网关相连的第 一发送装置、 与接收方网关相连的第一接收装置, 其中:
第一发送装置, 用于在所述发送方网关话带数据传输时, 发送含数据信 号检测器支持能力消息的第一信令;
第一接收装置, 用于接收所述第一信令;
所述接收方网关根据所述第一接收装置接收到的所述第一信令识别所述 发送方网关是否按含数据信号检测器方式发送数据, 若是, 则决定启动非话 音解码器对静音包进行解码; 否则决定不启动非话音解码器对静音包进行解 码。
12、 如权利要求 11所述的系统, 其特征在于, 进一步包括与所述接收方 网关相连的第二发送装置、 与所述发送方网关相连的第二接收装置, 其中: 第二发送装置, 用于若所述接收方网关决定启动非话音解码器对静音包 进行解码时, 当所述接收方网关不能启动所述非话音解码器时, 反馈含数据 信号检测器支持能力消息的第二信令;
第二接收装置, 用于接收所述第二信令;
所述发送方网关根据所述第二接收装置接收到的所述第二信令按不含数 据信号检测器的方式发送数据。
13、 如权利要求 12所述的系统, 其特征在于, 当所述发送方网关与接收 方网关以 H.248协议进行数据信号检测器能力协商时, 所述第二发送装置与 第二接收装置通过媒体处理设备与媒体控制设备发送与接收第二信令。
14、 如权利要求 12所述的系统, 其特征在于, 当所述发送方网关与接收 方网关以会话初始协议进行数据信号检测器能力协商时, 所述第二发送装置 通过会话初始协议消息请求发起端发送所述第二信令, 所述第二接收装置通 过所述会话初始协议消息应答端接收所述第二信令。
15、 如权利要求 11所述的系统, 其特征在于, 当所述发送方网关与接收 方网关以 H.248协议进行数据信号检测器能力协商时, 所述第一发送装置与 第一接收装置通过媒体处理设备与媒体控制设备发送与接收所述第一信令。
16、 如权利要求 11所述的系统, 其特征在于, 当所述发送方网关与接收 方网关以会话初始协议进行数据信号检测器能力协商时, 所述第一发送装置 通过会话初始协议消息请求发起端发送所述第一信令, 所述第一接收装置通 过所述会话初始协议消息应答端接收所述第一信令。
17、 一种具备协商数据信号检测器能力的发送方网关, 运用于分組网络 传真业务, 包括数据信号检测器, 其特征在于, 还包括第一发送装置, 用于 在所述发送方网关话带数据传输时, 发送含数据信号检测器支持能力消息的 第一信令。
18、 如权利要求 17所述的发送方网关, 其特征在于, 进一步包括第二接 收装置, 用于若所述接收方网关决定启动非话音解码器对静音包进行解码时, 当所述接收方网关不能启动所述非话音解码器时, 反馈含数据信号检测器支 持能力消息的第二信令。
19、 一种具备协商数据信号检测器能力的接收方网关, 运用于分組网络 传真业务, 包括非话音解码器, 其特征在于, 还包括第一接收装置, 用于接 收第一信令;
所述接收方网关根据所述第一接收装置接收到的所述第一信令识别所述 发送方网关是否按含数据信号检测器方式发送数据, 若是, 则决定启动非话 音解码器对静音包进行解码; 否则决定不启动非话音解码器对静音包进行解 码。
20、 如权利要求 19所述的接收方网关, 其特征在于, 进一步包括第二发 送装置, 用于若所述接收方网关决定启动非话音解码器对静音包进行解码时, 当所述接收方网关不能启动所述非话音解码器时, 反馈含数据信号检测器支 持能力消息的第二信令。
21、 一种协商数据信号检测器能力的方法, 运用于分组网络数据业务, 其特征在于, 包括如下步骤:
发送方网关在话带数据传输时, 发送含数据信号检测器支持能力消息的 第一信令;
接收方网关根据接收到的所述第一信令识别所述发送方网关是否按含数 据信号检测器方式发送数据, 若是, 则决定启动非话音解码器对静音包进行 解码; 否则决定不启动非话音解码器对静音包进行解码。
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