CN101217529B

CN101217529B - A method, device and system to realize ET.38 faxing business in the Internet

Info

Publication number: CN101217529B
Application number: CN200710000186.0A
Authority: CN
Inventors: 王鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-01-05
Filing date: 2007-01-05
Publication date: 2011-06-22
Anticipated expiration: 2027-01-05
Also published as: CN101217529A; WO2008086741A1

Abstract

The embodiment of the invention discloses a method for realizing ET.38 fax service among SIP terminals, which uses SDP to describe the relevant information of ET.38 ability, and realizes the interaction and negotiation of ET.38 ability among SIP conversation participants and establishes an ET.38 fax bearing passage by means of an SDP Offer/Answer mechanism, thus realizing the ET.38 fax service which is based on SIP protocol. The embodiment of the invention also discloses a method for realizing ET.38 fax service among H.248 terminals, which uses SDP to describe the ET.38 ability of the H.248 terminals, leads an MGC to acquire the ET.38 ability of MGW by means of an H.248 command or response mechanism, thus realizing the ET.38 fax service based on H.248 protocol. The embodiment of the invention furthermore discloses a system for realizing ET.38 fax service among SIP terminals, an SDP providing end device, an SDP answering end device, a system for realizing ET.38 fax service among H.248 terminals, MGC and H.248 terminals. Application of the invention can realize ET.38 fax service based on SIP protocol and H.248 protocol.

Description

In the internet, realize method, the Apparatus and system of ET.38 facsimile service

Technical field

The present invention relates to Internet Protocol (IP) facsimile art, particularly in IP network, realize strengthening T.38 method, the Apparatus and system of (ET.38) facsimile service.

Background technology

Conversation initialized protocol (SIP) can be used for setting up, revising and stop the both sides of IP network and Multimedia session in many ways.In the Session Initiation Protocol, use Session Description Protocol (SDP) to provide (Offer)/(Answer) mechanism of replying between SIP session participant, to carry out the mutual of media capability, finish the negotiation of bearing capacity and the foundation of carrying simultaneously.SDP Offer/Answer mechanism is called for short OA mechanism.

Fig. 1 is the schematic diagram of existing SDP Offer/Answer mechanism.Referring to Fig. 1, SDP shown in the figure provides end and SDP responding terminal to be the participant of same SIP session.At first, SDP provides end (Offerer) to send a SDP Offer to SDP responding terminal (Answerer), comprising SDP among this SDP Offer provides the media capability information of end, provide as SDP that end supports with the medium type of intending using, some parameter informations relevant etc. with the corresponding media address of certain medium type, code/decode type that port, medium adopted and encoding and decoding; Here, medium type can comprise voice, video, data etc.;

Then, by the media capability of SDP responding terminal according to this SDP Offer and SDP responding terminal self, determine ' the SDP responding terminal can or be ready the medium type supporting and use, and with corresponding medium coding/decoding capability of certain medium type etc., by SDP Answer SDP Offer is made and to reply; Provide among the SDP Answer that returns of end to SDP in the SDP responding terminal, need reply one by one the medium type that SDP offer provides, replying of each medium type comprised whether supporting this medium type, if also to need to support to return the code/decode type (may carry other code/decode types that the SDP responding terminal is supported simultaneously) that the SDP responding terminal selects for use, some parameter informations relevant etc. with the corresponding media address of this medium type, port and encoding and decoding;

At last, SDP provides end according to the SDP answer that receives, i.e. the result of ability negotiation sets up media channel with the SDP responding terminal.So far, finish the mutual and negotiation that SDP provides media capability between end and the SDP responding terminal, and set up media channel.

Facsimile service is a kind of business that the authentic work of medium such as photo, chart, letter, file is sent to far-end by wired electricity or radio device.T.38 with ET.38 two kinds of facsimile protocols of extensive use.

T.38 agreement is formulated by standardization department of International Telecommunications Union (ITU-T), the fax services of high-quality can be provided for the user in cable network, but, because characteristics such as T.38 agreement can not adapt to aerial interface instability in the wireless application, time-delay is big, data bandwidth is little make that T.38 agreement can't be used in the mobile network.For these reasons, third generation partner program (3GPP) has been formulated the ET.38 facsimile protocol that can use in the mobile network.Compare with agreement T.38, the ET.38 agreement all strengthens the code encoding/decoding mode of medium, packing manner, control signaling procedure etc. and revises, thereby makes ET.38 become a kind of facsimile protocol T.38, that can be used for the mobile network that is different from.

SIP session participant also shows as a kind of media capability to the support situation of certain facsimile protocol, for example: can be called T.38 ability to the support situation of agreement T.38.In the prior art, existence uses SDP to describe the T.38 technology of ability, make can carry out the T.38 mutual and negotiation of ability by Session Initiation Protocol, and the foundation of the bearer path of T.38 faxing, and then realize T.38 facsimile service.But, still do not exist in the prior art in the Session Initiation Protocol support the ET.38 ability mutual with the technology of consulting, cause when using Session Initiation Protocol to set up communication, can not set up ET.38 fax bearer path, thereby the ET.38 facsimile service can not be provided.

For media gateway protocols---also there are the problems referred to above in agreement H.248.H.248 agreement is the MGCP between Media Gateway Controller (MGC) and the media gateway (MGW), owing to do not make MGC obtain the technology of the ET.38 ability information of MGW in the prior art, cause when using H.248 agreement foundation communication, can not set up ET.38 fax bearer path, thereby the ET.38 facsimile service can not be provided.Among the present invention, with MGW as terminal H.248.

As seen from the above analysis, use in Session Initiation Protocol and/or the IP network that H.248 agreement is controlled session and media resource, the ET.38 facsimile service can not be provided existing.

Summary of the invention

In view of this, the embodiment of the invention is disclosed to be realized between sip terminal in the method for ET.38 facsimile service, aims to provide a kind ofly to support the mutual and negotiation method of ET.38 ability in Session Initiation Protocol, thereby realizes the ET.38 facsimile service based on Session Initiation Protocol.

H.248, the embodiment of the invention is disclosed to be realized between the terminal in the method for ET.38 facsimile service, aim to provide and a kind ofly support that in agreement H.248 MGC obtains the method for the ET.38 ability information of MGW, thereby realize based on the ET.38 facsimile service of agreement H.248.

The embodiment of the invention is disclosed to be realized between sip terminal in the system of ET.38 facsimile service, aim to provide a kind of in Session Initiation Protocol, support the ET.38 ability mutual with the system that consults, thereby realize ET.38 facsimile service based on Session Initiation Protocol.

The SDP of the disclosed realization of embodiment of the invention ET.38 facsimile service provides in the end device, aims to provide a kind of mutual SDP with negotiation of ET.38 ability that supports in Session Initiation Protocol end device is provided, thereby realize the ET.38 facsimile service based on Session Initiation Protocol.

In the SDP responding terminal device of the disclosed realization of embodiment of the invention ET.38 facsimile service, aim to provide a kind of SDP responding terminal device of supporting that in Session Initiation Protocol the ET.38 ability is mutual and consult, thereby realize ET.38 facsimile service based on Session Initiation Protocol.

H.248, the embodiment of the invention is disclosed to be realized between the terminal in the system of ET.38 facsimile service, aim to provide and a kind ofly support that in agreement H.248 MGC obtains the system of the ET.38 ability information of MGW, thereby realize based on the ET.38 facsimile service of agreement H.248.

Among the MGC of the disclosed realization of embodiment of the invention ET.38 facsimile service, aim to provide and a kind ofly H.248 supporting MGC to obtain the MGC of the ET.38 ability information of MGW in the agreement, thereby realize based on the ET.38 facsimile service of agreement H.248.

Among the MGW of the disclosed realization of embodiment of the invention ET.38 facsimile service, aim to provide and a kind ofly H.248 supporting MGC to obtain the MGW of the ET.38 ability information of MGW in the agreement, thereby realize based on the ET.38 facsimile service of agreement H.248.

For achieving the above object, the technical scheme of the embodiment of the invention specifically is achieved in that

A kind of method that between sip terminal, realizes the ET.38 facsimile service, this method may further comprise the steps:

Session Description Protocol SDP provides end that himself ET.38 ability information is carried on SDP and provides among the Offer, sends to the SDP responding terminal;

Described SDP responding terminal provides the ET.38 ability information of end and the ET.38 ability of described SDP responding terminal self according to described SDP, provides end to return SDP to described SDP and replys Answer;

If the media negotiation result among the described SDP Answer is for setting up ET.38 fax bearer path, then described SDP provides end and described SDP responding terminal to set up the fax bearer path according to the ET.38 agreement.

A kind of in the method that H.248 realizes the ET.38 facsimile service between the terminal, this method may further comprise the steps:

MGC sends with the medium of described H.248 terminal to described H.248 terminal respectively and handles relevant order;

Described H.248 terminal respectively himself ET.38 ability information is carried on the corresponding response message of described order in send to described MGC;

If described H.248 terminal all possesses the ET.38 ability, then described MGC sets up the described H.248 fax bearer path between the terminal according to the ET.38 agreement.

A kind of system that between sip terminal, realizes the ET.38 facsimile service, this system comprises: SDP provides end device and SDP responding terminal device;

Described SDP provides end device, is used for sending to described SDP responding terminal device the SDP Offer of the ET.38 ability information that carries himself, and receives the SDP Answer that carries the media negotiation result that comes from described SDP responding terminal device;

Described SDP responding terminal device, be used to receive and come from the SDPOffer that described SDP provides end device, and provide the ET.38 ability information of end device and the ET.38 ability of described SDP responding terminal device self according to the described SDP among the described SDP Offer, media negotiation result's SDP Answer is provided end device to return to carry to described SDP;

Described SDP provides end device and described SDP responding terminal device, is used for the media negotiation result according to described SDPAnswer, sets up the fax bearer path according to the ET.38 agreement.

A kind of SDP of the ET.38 of realization facsimile service provides end device, and this SDP provides end device to comprise: SDP Offer generation module, SDP provide end interface module and SDP to provide end to be connected and set up module;

Described SDP Offer generation module is used for providing the ET.38 ability of end device to generate according to described SDP and carries the SDP Offer that described SDP provides the ET.38 ability information of end, and sends to described SDP the end interface module is provided;

Described SDP provides the end interface module, and the SDP Offer that is used for coming from described SDP Offer generation module sends to SDP responding terminal device, and the SDP that described SDP responding terminal device is returned

Answer sends to described SDP provides the end connection to set up module;

Described SDP provides end to connect and sets up module, is used for according to coming from the described SDP Answer that described SDP provides the end interface module, sets up described SDP according to the ET.38 agreement fax bearer path between end device and the described SDP responding terminal device is provided.

A kind of SDP responding terminal device of realizing the ET.38 facsimile service, this SDP responding terminal device comprises: SDP responding terminal interface module, SDP Answer generation module are connected with the SDP responding terminal sets up module;

Described SDP responding terminal interface module is used to receive and comes from SDP the SDPOffer of end device is provided, sends to described SDP Answer generation module, and the SDP Answer that will come from described SDP Answer generation module sends to described SDP end device is provided;

Described SDP Answer generation module, be used for providing the ET.38 ability information of end device and the ET.38 ability of described SDP responding terminal device self to generate SDP Answer according to the described SDP that comes from the SDP Offer of described SDP responding terminal interface module, send to described SDP by described SDP responding terminal interface module end device is provided, and notify described SDP responding terminal to connect and set up module;

Described SDP responding terminal connects sets up module, is used for according to described SDP Answer, sets up described SDP responding terminal device and described SDP provides the bearer path of the fax between the end device according to the ET.38 agreement.

A kind of in the system that H.248 realizes the ET.38 facsimile service between the terminal, this system comprises: MGC, the one is terminal and the 2nd terminal H.248 H.248;

Described MGC, be used for respectively to the described the one H.248 terminal with the 2nd H.248 terminal send the relevant order of medium processing with described H.248 terminal, and the described the one H.248 terminal and the 2nd set up the described H.248 fax bearer path between the terminal according to the ET.38 agreement when H.248 terminal all possesses the ET.38 ability;

The described the one terminal and the 2nd terminal H.248 H.248 is used for separately himself ET.38 ability information is carried on the corresponding response message of described order and sends to described MGC.

A kind of MGC that realizes the ET.38 facsimile service, this MGC comprises: order generation module, MGC interface module are connected with MGC sets up module;

Described order generation module is used to generate and the H.248 relevant order of terminal media processing, and sends to described H.248 terminal by described MGC interface module;

Described MGC interface module, be used for sending with described H.248 terminal media and handle relevant order, and the response message that will come from the ET.38 ability information of the described H.248 terminal of carrying of described H.248 terminal sends to described MGC connection and sets up module to described H.248 terminal;

Module is set up in described MGC connection, is used for the H.248 ET.38 ability of terminal of basis, sets up the H.248 fax bearer path between the terminal according to the ET.38 agreement.

A kind of H.248 terminal that realizes the ET.38 facsimile service, this H.248 terminal comprise: H.248 terminal interface module, response generation module are connected with terminal H.248 and set up module;

Described H.248 terminal interface module is used to receive and comes from medium MGC and described H.248 terminal and handle relevant order, send to described response generation module, and the response message that will come from described response generation module sends to described MGC;

Described response generation module, be used for ET.38 ability information with described H.248 terminal and be carried on the corresponding response message of described order and send to described H.248 terminal interface module, and notify described H.248 terminal to connect the ET.38 ability of described H.248 terminal and set up module;

Described H.248 terminal connects sets up module, is used for setting up the fax bearer path according to the ET.38 agreement.

As seen from the above technical solution, the embodiment of the invention is disclosed to be realized between sip terminal in the technical scheme of ET.38 facsimile service, by in SDP, describing SIP session participant's ET.38 ability, and realize the mutual of ET.38 ability between the SIP session participant and consult by SDP Offer/Answer mechanism, and the foundation of ET.38 fax bearer path, thereby realized providing ET.38 facsimile service based on Session Initiation Protocol.And, H.248, the embodiment of the invention is disclosed to be realized between the terminal in the technical scheme of ET.38 facsimile service, use SDP to describe the H.248 ET.38 ability of terminal, make MGC to obtain the ET.38 ability of MGW, thereby realized based on the ET.38 facsimile service of agreement H.248 by command mechanism H.248.

Use the disclosed technical scheme of the embodiment of the invention, can be various based on SIP and/or H.248 realize the mutual of ET.38 ability and consult in the application of agreement, and the foundation of ET.38 fax bearer path, this not only solved based on SIP and H.248 agreement can not provide the ET.38 facsimile service this technical problem, and, for the Fax over IP field, have unusual meaning.This be because: on the one hand, the ET.38 facsimile protocol can be operated under cable network and the mobile network environment well, promptly can overcome other facsimile protocols and can not be operated in this shortcoming under the mobile network environment, and mobile network's application will be very general; On the other hand, Session Initiation Protocol and H.248 agreement be respectively of paramount importance application layer control protocol and MGCP in the next generation network, based on SIP and H.248 the application of agreement with ubiquitous, this shows, the present invention has realized the facsimile service among the mobile network and Session Initiation Protocol and combining of agreement H.248, has promoted the progress in Fax over IP field.

Description of drawings

Fig. 1 is the schematic diagram of existing SDP Offer/Answer mechanism.

Fig. 2 is the invention process row one are realized ET.38 facsimile service method between sip terminal a exemplary process diagram.

Fig. 3 is a method flow diagram of realizing the ET.38 facsimile service in the embodiment of the invention one.

Fig. 4 is that the system that realizes the ET.38 facsimile service in the embodiment of the invention one forms structural representation.

Fig. 5 forms structural representation for SDP in the system shown in Figure 4 provides the inside of end device.

Fig. 6 is that structural representation is formed in the inside of SDP responding terminal device in the system shown in Figure 4.

Fig. 7 is that the invention process row two are in the exemplary process diagram that H.248 realizes ET.38 facsimile service method between the terminal.

Fig. 8 is a method flow diagram of realizing the ET.38 facsimile service in the embodiment of the invention two.

Fig. 9 is that the system that realizes the ET.38 facsimile service in the embodiment of the invention two forms structural representation.

Figure 10 is that structural representation is formed in the inside of MGC equipment in the system shown in Figure 9.

Figure 11 is that structural representation is formed in the inside of MGW equipment in the system shown in Figure 9.

Figure 12 is a method flow schematic diagram of realizing the ET.38 facsimile service in the embodiment of the invention three.

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.

The main thought of the embodiment of the invention is to use SDP to describe the relevant information of ET.38 ability, and realize the mutual of ET.38 ability between the SIP session participant and consult by SDP Offer/Answer mechanism, and the foundation of ET.38 fax bearer path, thereby realization is based on the ET.38 facsimile service of Session Initiation Protocol.Because H.248 SDP also can be carried in the protocol message, make MGC to obtain the ET.38 ability of MGW, thereby realize based on the ET.38 facsimile service of agreement H.248 by command mechanism H.248.

Below respectively between sip terminal, realizing the technical scheme of ET.38 facsimile service, and be elaborated in the technical scheme that H.248 realizes the ET.38 facsimile service between the terminal.

Embodiment one:

Present embodiment is presented in the method that realizes the ET.38 facsimile service between the sip terminal, the embodiment of Apparatus and system.

Fig. 2 is the embodiment of the invention one realizes ET.38 facsimile service method between sip terminal a exemplary process diagram.Referring to Fig. 2, this exemplary flow may further comprise the steps:

Step 201:SDP provides end that the ET.38 ability information of himself is carried among the SDP Offer, sends to the SDP responding terminal;

Step 202:SDP responding terminal provides the ET.38 ability information of end and the ET.38 ability of this SDP responding terminal self according to SDP, provides end to return SDP Answer to SDP;

Step 203: if the media negotiation result among the SDP Answer is for setting up ET.38 fax bearer path, then SDP provides end and SDP responding terminal to set up the fax bearer path according to the ET.38 agreement.

So far, finish the invention process row one are realized ET.38 facsimile service method between sip terminal exemplary flow.

In above-mentioned exemplary flow, use the SDP Offer/Answer mechanism in the Session Initiation Protocol to finish the negotiation of ET.38 media capability and the foundation of media channel.According to Session Initiation Protocol and related expanding standard, in following sip message reciprocal process, can finish SDP Offer/Answer process respectively one time, thereby realize the foundation and the modification of media bearer passage in the Session Initiation Protocol.For example:

INVITE request message and to the Temporary Response message of this request message: in the INVITE request message, carry SDP Offer, and carry SDPAnswer by the Temporary Response message of this INVITE request message; Here, Temporary Response message can comprise all the Temporary Response message except that 100 response messages;

INVITE request message and to the success response message of this request message: in the INVITE request message, carry SDP Offer, and carry SDPAnswer by the success response message of this INVITE request message; Here, success response message can comprise response message, and is the most common with 200 response messages at present;

To the success response message of INVITE with to affirmation (ACK) message of this success response message: in success response message, carry SDP Offer, and carry SDP Answer by ACK message to this success response message to INVITE;

To the reliable Temporary Response message of INVITE with to affirmation (PRACK) message of this Temporary Response message: in reliable Temporary Response message, carry SDP Offer, and carry SDP Answer by PRACK message to this Temporary Response message to INVITE; Here, can comprise Temporary Response message except that 100 response messages to the reliable Temporary Response message of INVITE;

To the PRACK message of reliable Temporary Response message with to the success response message of this PRACK message: in PRACK message, carry SDP Offer, and carry SDP Answer by success response message to this PRACK message to reliable Temporary Response message;

UPDATE request message and to the success response message of this request message: in the UPDATE request message, carry SDP Offer, and carry SDP Answer by success response message to this UPDATE request message.

When in above-mentioned SDP Offer or SDP Answer, carrying the ET.38 ability information, can expansion and the corresponding code/decode type of ET.38 ability on the basis of existing medium type earlier, information such as description and the corresponding address of this code/decode type, port in SDP then.

Usually, adopt the mode extended medium type of new multipurpose internet mail expansion (MIME) type of definition, when defining new mime type, need definition: the title (sub type name) of the title of MIME medium type (media type name), MIME subtype, when this medium type exists mandatory parameter (Required parameters) and optional parameters (Optional parameters), also should define the mandatory parameter and the optional parameters of this medium type.

Because the ET.38 agreement does not also rely on the bottom host-host protocol, therefore, ET.38 can transmit based on real-time transport protocol (rtp), user datagram transport layer protocol (UDPTL), User Datagram Protoco (UDP) (UDP), transmission control protocol bottom host-host protocols such as (TCP) in actual applications, so all can expand with the corresponding mime type of ET.38 ability as follows at any bottom host-host protocol:

MIME media type name:Audio or video or image or application or data

MIME?sub?type?name：et38

In above-mentioned mime type expansion, Audio represents audio frequency, and video represents video, image presentation video, application are represented to use, and data represents data, these several medium types are existing medium types of standard, and are the medium types commonly used in the facsimile service; At these medium types or other medium types, can define the MIME subtype of code/decode format of this medium type of expression, in the present invention, i.e. ET.38 protocol encoding and decoding form.Here, with the identifier of et38, only be the symbol of a sign ET.38 as this MIME subtype, also can represent ET.38 protocol encoding and decoding form in actual applications with other identifiers.

When ET.38 transmitted based on UDPTL, UDP and Transmission Control Protocol, the mime type of above-mentioned expansion need not mandatory parameter, also can not define optional parameters; When ET.38 transmits based on Real-time Transport Protocol, owing to need specify the clock frequency of encoding and decoding when in SDP, describing the transmission based on Real-time Transport Protocol, therefore, although this clock frequency parameter there is no practical significance concerning ET.38 itself, still need to define a mandatory parameter and represent this clock frequency, as follows:

Required?parameters：rate

Wherein, rate is the identifier of clock frequency parameter.In SDP, this parameter will be mapped to the clock frequency part of the a=rtpmap of SDP.

Expand after the above-mentioned medium type, just can in SDP, describe SIP session participant's ET.38 ability information.Respectively at RTP, UDPTL, UDP and Transmission Control Protocol, illustrate and how to construct the SDP that carries the ET.38 ability information below.

Example one: based on the SDP example of Real-time Transport Protocol

m＝audio?6800RTP/AVP?98

c＝IN?IP4192.0.2.2

a＝rtpmap:98et38/8000

According to Session Initiation Protocol, the capable relevant information that is used for describing certain Media Stream of session of each m comprises information such as medium type, transport address, code/decode format, and c is capable to be used to describe link information, the capable descriptive session attribute that is used for of a; Each m is capable can to comprise that zero or a c are capable, and an a is capable arbitrarily.

Above-mentioned example one expression: this SIP session participant's address is 192.0.2.2, support that at end PT Payload Type (payload type) is 98 and the audio service that adopts Real-time Transport Protocol to transmit on 6800, and by the 3rd row as can be known, PT Payload Type 98 should be mapped as the newly-increased subtype et38 of present embodiment, its encoding and decoding clock frequency is 8000Hz, therefore, the code/decode format of above-mentioned audio service is the ET.38 protocol format.

In above-mentioned example one, earlier with 98 expression PT Payload Types,, be the form needs during for the transmission in SDP, described based on Real-time Transport Protocol again with the capable mapping of carrying out code/decode format and clock frequency of a, here, be not more than 127 integer arbitrarily and all can be used to represent PT Payload Type.

When adopting other medium types such as ET.38 form, Real-time Transport Protocol transmission of video, image, application or data, the identifier that the audio with above-mentioned m in capable replaces with video, image, application, data or other medium types gets final product.In addition, above-mentioned address and port numbers in the specific implementation, can be made amendment according to actual conditions only for illustrating.

Example two: based on the SDP example of UDPTL agreement

m＝image?15002udptl?et38

c＝IN?IP4?192.0.2.2

Above-mentioned example two expressions: this SIP session participant's address is 192.0.2.2, supports code/decode format to be ET.38 and to adopt the DUPTL agreement to carry out the image transmitted business on port one 5002.

When adopting other medium types such as ET.38 form, the application of DUPTL protocol transmission, audio frequency, video or data, the identifier that the image with above-mentioned m in capable replaces with application, audio, video, data or other medium types gets final product.In addition, above-mentioned address and port numbers in the specific implementation, can be made amendment according to actual conditions only for illustrating.

Example three: based on the SDP example of udp protocol

m＝image?15002udp?et38

c＝IN?IP4?192.0.2.2

Above-mentioned example three expressions: this SIP session participant's address is 192.0.2.2, supports code/decode format to be ET.38 and to adopt udp protocol to carry out the image transmitted business on port one 5002.

When adopting other medium types such as ET.38 form, udp protocol transmission application, audio frequency, video or data, the identifier that the image with above-mentioned m in capable replaces with application, audio, video, data or other medium types gets final product.In addition, above-mentioned address and port numbers in the specific implementation, can be made amendment according to actual conditions only for illustrating.

Example four: based on the SDP example of Transmission Control Protocol

m＝image?15002tcp?et38

c＝IN?IP4?192.0.2.2

a＝setup:passive

a＝connection:new

Above-mentioned example four expressions: this SIP session participant's address is 192.0.2.2, on port one 5002, support code/decode format to be ET.38 and to adopt Transmission Control Protocol to carry out the image transmitted business, and this session connection is new, as to wait for an opposite end foundation connection.In the response corresponding to this SDP, should comprise " a=setup:active " OK during session attribute is capable.

When adopting other medium types such as ET.38 form, Transmission Control Protocol transmission application, audio frequency, video or data, the identifier that the image with above-mentioned m in capable replaces with application, audio, video, data or other medium types gets final product.In addition, above-mentioned address and port numbers in the specific implementation, can be made amendment according to actual conditions only for illustrating.

In actual applications, SDP in the SDP Offer/Answer mechanism provide between end and the SDP responding terminal alternately, to be instantiated as in certain SIP session media processing units of an end (MP) and media control unit (MC), and mutual between the MP of the other end and the MC.The thought MP and the MC that are separated according to medium and control handle the mutual of medium face and chain of command respectively, and MP and MC can be two independently physical equipments, also can be arranged in same physical equipment.When SDP provides the MP of end and MC to be two separate equipment, provide before end sends SDP Offer at SDP, MC need obtain the ET.38 ability information of MP; Similarly, when the MP of SDP responding terminal and MC are two independently during physical equipment, before the SDP responding terminal was returned SDP Answer, MC also needed to obtain the ET.38 ability information of MP.

Fig. 3 is a method flow diagram of realizing the ET.38 facsimile service in the embodiment of the invention one.Referring to Fig. 3, wherein, MP1 and MC1 provide end, separate MP and MC equipment for SDP, and MP2 and MC2 are the MP SDP responding terminal, separate and MC equipment.Method shown in Figure 3 may further comprise the steps:

Step 301:MC1 and MC2 obtain the media processing capacity of MP1 and MP2 respectively.

In this step, MC1 and MC2 are respectively by the interface between itself and MP1 and the MP2 or obtain the media processing capacity of MP1 and MP2 by the local data configuration.This media processing capacity comprises MP1 and the MP2 support situation to the ET.38 facsimile service.Wherein, MC obtains the operation of MP media processing capacity and can not finish in this step, but obtains when MC need obtain the MP media processing capacity in subsequent step temporarily, for example, can be to obtain when MP initiates the asset creation request at MC.If MP and MC are arranged in same physical equipment, then the MC operation of obtaining the media processing capacity of MP belongs to device interior and operates.

In this step, can be undertaken alternately by agreement H.248 between same end of session and separate MC and the MP, so that MC obtains the ET.38 ability information of MP.Present embodiment is mainly described mutual between MC1 and the MC2 in detail, about see also the appropriate section of embodiment two between MC and the MP based on the mutual situation of agreement H.248, does not repeat them here.In agreement H.248, MP and MC correspond respectively to MGW and MGC.

Step 302:MC1 initiates the asset creation request to MP1, gets access to the relevant information of media capability such as address, port of the media resource of being created.

If before this step, MC1 does not also get access to the media capability information of MP1, and then the operation of this step can make MC1 get access to the media capability information of MP1 simultaneously.

Step 303:MC1 initiates medium to MC2 and sets up request, and the ET.38 ability information of carrying MP1 in this request.

In this step, initiating the INVITE request with MC1 to MC2 is that example describes, in actual applications, as previously mentioned, any message that can carry SDP Offer in a SDP Offer/Answer process all can be initiated medium to MC2 as MC1 in this step and set up request.

In this step, in INVITE request, carry SDP Offer, carry the media capability information of the MP1 that gets access in the abovementioned steps among the SDP Offer, comprise the address, port, code/decode format of media resource etc.For example, suppose that MP1 had both supported the T.38 fax based on Real-time Transport Protocol, support the ET.38 fax based on Real-time Transport Protocol again, then in this step, MC1 can comprise ability description as follows in the SDP Offer that MC2 sends:

v＝0

o＝-11IN?IP4mp1.example1.com

s＝-

c＝IN?IP4mp1.example1.com

t＝00

m＝audio?5764RTP/AVP?98?99

a＝rtpmap:98et38/8000

a＝rtpmap:99t38/8000

a＝fmtp:99T38FaxVersion＝2；T38FaxRateManagement＝transferredTCF

According to SIP and SDP agreement, v is capable to be used to describe protocol version information, capable relevant information and the Session ID that is used for the descriptive session promoter of o, and the capable descriptive session title that is used for of s, t is capable to be used to represent the session activation time.Aforementioned capabilities is described expression: it is mp1.example1.com that this SDP provides the address of end, supports that on port 5764 PT Payload Type is 98 and 99 and the audio service that adopts Real-time Transport Protocol to transmit.As can be known capable by 7-8,98 should be mapped as subtype et38, and 99 should be mapped as subtype t38, the encoding and decoding clock frequency of et38 and t38 is 8000Hz, therefore, above-mentioned SDP provides end both to support T.38 audio faxing based on Real-time Transport Protocol, supports the ET.38 audio faxing based on Real-time Transport Protocol again.

In actual applications, can increase the description of other the parameter relevant, thereby realize the mutual and negotiation of other parameters according to the network environment of reality and the needs of application with the ET.38 facsimile service.

Step 304:MC2 control MP2 creates the local terminal media resource, gets access to the relevant information of media capability such as address, port of the media resource of being created.

If before this step, MC2 does not also get access to the media capability information of MP2, and then the operation of this step can make MC2 get access to the media capability information of MP2 simultaneously.

Step 305:MC2 returns 200 OK response messages to MC1, and carries the media negotiation result in this response message.

In this step, corresponding to the INVITE request message in the step 303, returning the 200OK response message with MC2 to MC1 is that example describes, in actual applications, as previously mentioned, any message corresponding with the INVITE request message, can carry SDP Answer in a SDP Offer/Answer process all can be used as the message that MC2 returns to MC1 in this step.

In this step, in the 200OK response message, carry SDP Answer, carry the media negotiation result among the SDP Answer, for example, whether use ET.38 to carry out facsimile service etc., wherein may comprise the media processing capacity information of part or all of MP2.

Suppose that MP2 supports the ET.38 fax based on RTP, and also wish to use ET.38 to carry out facsimile service that MC2 can return following SDP Answer to MC1 so:

v＝0

o＝-11?IN?IP4mp2.example2.com

s＝-

c＝IN?IP4mp2.example2.com

t＝00

m＝audio?10000RTP/AVP?98

a＝rtpmap:98et38/8000

Above-mentioned SDP Answer represents: the SDP responding terminal is used the address, and to provide end to set up PT Payload Type based on Real-time Transport Protocol with SDP be 98 fax bearer path for 10000 as mp2.example2.com, port numbers.By the 7th row as can be known, 98 should be mapped as subtype et38, and its encoding and decoding clock frequency is 8000Hz, and therefore, the result of above-mentioned media negotiation sets up the fax bearer path that code/decode format is ET.38, for the user provides facsimile service.

Step 306:MC1 upgrades the distant end media resource information according to received SDP Answer to MP1.

In this step, MC1 will upgrade the distant end media resource information to MP1 according to the media negotiation result among the SDP Answer.

Step 307:MC1 returns ACK message to MC2.

Step 308:MP1 and MP2 carry out the business of ET.38 facsimile service or other types according to the media negotiation result.

In this step, if the ET.38 that is to use that returns among the SDP Answer that carries in the aforementioned 200OK response message sets up the fax bearer path, then will be between MP1 and the MP2 according to the foundation of bearer path of faxing of ET.38 agreement, and carry out facsimile service communication.

So far, finish to realize in the embodiment of the invention one method flow of ET.38 facsimile service.

More than describe the embodiment that realizes ET.38 facsimile service method in the embodiment of the invention one in detail, below in conjunction with realizing the device of ET.38 facsimile service and the embodiment of system in the description of drawings embodiment of the invention one.

Fig. 4 is that the system that realizes the ET.38 facsimile service in the embodiment of the invention one forms structural representation.Referring to Fig. 4, this system comprises: SDP provides end device 410 and SDP responding terminal device 420;

Wherein, SDP provides end device 410, is used for carrying the SDP Offer that SDP provides the ET.38 ability information of end device 410 to 420 transmissions of SDP responding terminal device, and receives the SDP Answer that carries the media negotiation result that comes from SDP responding terminal device 420;

SDP responding terminal device 420, be used to receive and come from the SDPOffer that described SDP provides end device 410, and provide the ET.38 ability of the ET.38 ability information of end device 410 and SDP responding terminal device 420 self according to the SDP among the SDP Offer, the SDP Answer that provides end device 410 to return to carry the media negotiation result to SDP;

SDP provides end device 410 and described SDP responding terminal device 420, is used for the media negotiation result according to SDP Answer, sets up the fax bearer path according to the ET.38 agreement.

And SDP provides end device, is further used for judging that media negotiation result among the SDP Answer is whether for setting up ET.38 fax bearer path.

In the system shown in Figure 4, SDP provides end device 410 to carry SDP Offer by the INVITE request message, and SDP responding terminal device 420 can be by carrying described SDP Answer to Temporary Response message this INVITE request message, except that 100 response messages;

Or SDP provides end device 410 to carry SDP Offer by the INVITE request message, and SDP responding terminal device 420 can carry SDP Answer by the success response message to this INVITE request message;

Or SDP provides end device 410 to carry SDP Offer by the success response message to INVITE, and SDP responding terminal device 420 can carry SDP Answer by the ACK message to this success response message;

Or SDP provides the end device 410 can be by reliable Temporary Response message INVITE, except that 100 response messages are carried SDP Offer, and SDP responding terminal device 420 can carry SDP Answer by the PRACK message to this Temporary Response message;

Or SDP provides end device 410 to carry SDP Offer by the PRACK message to reliable Temporary Response message, and SDP responding terminal device 420 can carry SDP Answer by the success response message to PRACK message;

Or SDP provides end device 410 to carry SDP Offer by the UPDATE request message, and SDP responding terminal device 420 can carry SDP Answer by the success response message to this UPDATE request message.

As previously mentioned, in actual applications, SDP in the SDP Offer/Answer mechanism provides end and SDP responding terminal will be instantiated as in certain SIP session, the MP of one end and MC, and the MP of the other end and MC, therefore, end device and SDP responding terminal device are provided is MC equipment in the practical application and the combination of MP equipment to SDP shown in Figure 4.Wherein, mainly the finishing alternately between end and the responding terminal that provide based on SDP Offer/Answer mechanism by MC equipment, the media capability information that provides SDP that end and SDP responding terminal are provided to MC equipment is provided MP equipment, and sets up bearer path according to the result of capability negotiation.

In the system shown in Figure 4, when SDP provides end 410 to be made of separate MP and MC, this MC can send the relevant order of medium processing with MP to this MP, and this MP can be carried on the ET.38 ability information of himself to order with this and send to this MC in corresponding response message;

When SDP responding terminal 420 was made of separate MP and MC, this MC can send the relevant order of medium processing with MP to this MP, and this MP can be carried on the ET.38 ability information of himself to order with this and send to this MC in corresponding response message.

Among the device embodiment below, being arranged in same physical equipment with MC and MP is that example describes, therefore, the function of being finished separately for MC and MP equipment will be not in addition strict division.

Fig. 5 forms structural representation for SDP in the system shown in Figure 4 provides the inside of end device.Referring to Fig. 5, this SDP provides end device to comprise: SDP Offer generation module 501, SDP provide end interface module 502 and SDP to provide end to be connected and set up module 503.

Wherein, SDP Offer generation module 501 is used for providing the ET.38 ability of end device 410 to generate according to SDP and carries the SDP Offer that SDP provides the ET.38 ability information of end device 410, and sends to SDP end interface module 502 is provided; And, the described SDP that carries that SDP Offer generation module 501 is generated provides the SDP Offer of the ET.38 ability information of end to be: carry and the corresponding code/decode type of ET.38 ability, and with the SDP Offer of the corresponding address of described medium type, port information;

SDP provides end interface module 502, and the SDPOffer that is used for coming from SDP Offer generation module 501 sends to SDP responding terminal device 420, and the SDPAnswer that SDP responding terminal device 420 returns is sent to SDP provides end to connect to set up module 503;

SDP provides end to connect and sets up module 503, is used for according to coming from the SDP Answer that SDP provides end interface module 502, sets up SDP according to the ET.38 agreement fax bearer path between end device 410 and the SDP responding terminal device 420 is provided; And SDP provides end to connect to set up module 503 to be further used for judging that whether media negotiation result among the SDP Answer is for setting up ET.38 fax bearer path.

SDP shown in Figure 5 provides in the end device, and SDP Offer generation module 501 can be carried on the SDP Offer that is generated and sends to SDP in the INVITE request message end interface module 502 is provided;

Or, the SDP Offer that is generated can be carried on and send to SDP in the success response message to INVITE end interface module 502 is provided;

Or the SDP Offer that is generated can be carried on provides end interface module 502 to sending to SDP in reliable Temporary Response message INVITE, except that 100 response messages;

Or, the SDP Offer that is generated can be carried on and send to SDP in the PRACK message to reliable Temporary Response message end interface module 502 is provided;

Or, the SDP Offer that is generated can be carried on and send to SDP in the UPDATE request message end interface module 502 is provided.

Fig. 6 is that structural representation is formed in the inside of SDP responding terminal device in the system shown in Figure 4.Referring to Fig. 6, this SDP responding terminal device comprises: SDP responding terminal interface module 601, SDP Answer generation module 602 are connected with the SDP responding terminal sets up module 603.

Wherein, SDP responding terminal interface module 601, be used to receive and come from SDP the SDP Offer of end device 410 is provided, send to SDP Answer generation module 602, and the SDP Answer that will come from SDP Answer generation module 602 sends to SDP end device 410 is provided;

SDP Answer generation module 602, be used for providing the ET.38 ability of the ET.38 ability information of end device 410 and SDP responding terminal device 420 self to generate SDP Answer according to the SDP that comes from the SDP Offer of SDP responding terminal interface module 601, send to SDP by SDP responding terminal interface module 602 end device 410 is provided, and module 603 is set up in the connection of notice SDP responding terminal;

The SDP responding terminal connects sets up module 603, is used for the Answer according to SDP, sets up SDP responding terminal device 420 and SDP provides the bearer path of the fax between the end device 410 according to the ET.38 agreement.

In the SDP responding terminal device shown in Figure 6, SDP Answer generation module 602 can be carried on the SDP Answer that is generated sending to SDP responding terminal interface module 601 in the Temporary Response message INVITE request message, except that 100 response messages;

Or, the SDP Answer that is generated can be carried in the success response message to the INVITE request message and send to SDP responding terminal interface module 601;

Or, the SDP Answer that is generated can be carried in the ACK message to the success response message of INVITE and send to SDP responding terminal interface module 601;

Or, the SDP Answer that is generated can be carried in the PRACK message to reliable Temporary Response message INVITE, except that 100 response messages and send to SDP responding terminal interface module 601;

Or, the SDP Answer that is generated can be carried in the success response message to the PRACK message of reliable Temporary Response message and send to SDP responding terminal interface module 601;

Or, the SDP Answer that is generated can be carried in the success response message to the UPDATE request message and send to SDP responding terminal interface module 601.

As seen from the above-described embodiment, in the technical scheme that between sip terminal, realizes the ET.38 facsimile service disclosed in this invention, by in SDP, describing SIP session participant's ET.38 ability, and realize the mutual of ET.38 ability between the SIP session participant and consult by SDP Offer/Answer mechanism, and the foundation of ET.38 fax bearer path, thereby realized providing ET.38 facsimile service based on Session Initiation Protocol.

Embodiment two:

Present embodiment is presented in the method that H.248 realizes the ET.38 facsimile service between the terminal, the embodiment of Apparatus and system.In the description process below, MGW is counted as a kind of H.248 terminal.

Fig. 7 is that the invention process row two are in the exemplary process diagram that H.248 realizes ET.38 facsimile service method between the terminal.Referring to Fig. 7, this exemplary flow may further comprise the steps:

Step 701:MGC is respectively to H.248 terminal transmission and the H.248 relevant order of medium processing of terminal;

Step 702:H.248 terminal is carried on himself ET.38 ability information respectively to order in the corresponding response message with this and sends to MGC;

Step 703: if above-mentioned H.248 terminal all possesses the ET.38 ability, then MGC sets up the above-mentioned H.248 fax bearer path between the terminal according to the ET.38 agreement.

So far, finish the invention process row two in the exemplary flow that H.248 realizes ET.38 facsimile service method between the terminal.

In above-mentioned exemplary flow, use the command mechanism in the agreement H.248 to make MGC get access to the H.248 ET.38 media capability information of terminal.According to H.248 agreement and related expanding standard, in following H.248 message interaction process, all can make MGC get access to the H.248 ET.38 media capability information of terminal.For example:

MGC sends the audit order to MGW, and MGW reports MGC with the ET.38 ability information of himself in the audit response message that returns to MGC;

MGC sends the interpolation (Add) of specifying the media resource code/decode format of creating to MGW and orders, and MGW sends to MGC with the media processing capacity information of the media resource created by the interpolation response message; Wherein, the media processing capacity information of the media resource of being created comprises ET.38 coding/decoding capability information;

MGC sends the interpolation order of the media resource of specify creation ET.38 code/decode format to MGW, MGW creates media resource according to the code/decode format of MGC appointment, and after the establishment of finishing media resource, the media processing capacity information of the media resource created is sent to MGC by adding response message; Wherein, the media processing capacity information of the media resource of being created comprises ET.38 coding/decoding capability information;

MGC sends modification (Mod) order of revising media resource to MGW, revise in the order at this, the media capability information that MGC can specify local terminal and/or opposite end to adopt or support, comprising ET.38 coding/decoding capability information, MGW carries out media capability is made amendment according to the appointment of MGC, and after revising, himself ET.38 ability information is carried on to revise in the response message sends to MGC;

MGC is used for sending to MGW mobile (Mov) order of mobile end points (Terminal), in this movement directive, the media capability information that MGC can specify local terminal and/or opposite end to adopt or support, comprising ET.38 coding/decoding capability information, MGW is carried on himself ET.38 ability information in the mobile response message and sends to MGC.

According to agreement H.248, can use SDP agreement or abstract syntax notation one (ASN.1) to be described to local terminal or distant end media information.The method of use SDP protocol description local terminal or distant end media information sees also the appropriate section among the embodiment one, does not repeat them here.

In actual applications, the MGW at communication two ends may be two MGW under the same MGC control, at this moment, only needs MGC to obtain the media processing capacity of MGW respectively, and whether all support ET.38 according to two MGW, whether decision sets up two ET.38 fax bearer path between the MGW.Be respectively the situation of two MGC control MGW down for the MGW at two ends, fax before the bearer path setting up two ET.38 between the MGW, the MGC at two ends need carry out the negotiation of media capability.The process of this media capability negotiation can realize by Session Initiation Protocol.

Fig. 8 is a method flow diagram of realizing the ET.38 facsimile service in the embodiment of the invention two.Referring to Fig. 8, being respectively two two MGC control MGW down with two MGW in this example is example, and wherein MGW1 and MGC1 are the MGW and the MGC equipment of the end of communicating by letter, and MGW2 and MGC2 are the MGW and the MGC equipment of the other end of communicating by letter.Method shown in Figure 8 may further comprise the steps:

Step 801:MGC1 sends the Add order to MGW1, specifies MGW1 to create ET.38 media resource end points.

In this step, sending the Add order with MGC1 to MGW1 is that example describes, and in actual applications, as previously mentioned, anyly all can be used for this step with MGW medium processing order relevant, that can make MGC obtain the media capability information of MGW.

Step 802:MGW1 creates the media resource end points, and returns the Add response message of other information such as the media capability information of carrying the media resource end points of creating to some extent, code/decode format, address, port to MGC1.

Step 803:MGC1 initiates medium to MGC2 and sets up request, and the ET.38 ability information of carrying MGW1 in this request.

In this step, carrying out based on Session Initiation Protocol alternately between MGC1 and the MGC2.Here, initiating the INVITE request with MGC1 to MGC2 is that example describes, in actual applications, as previously mentioned, any message that can carry SDP Offer in a SDP Offer/Answer process all can be initiated medium to MGC2 as MGC1 in this step and set up request.

In this step, in INVITE request, carry SDP Offer, carry the media capability information of the MGW1 that gets access in the abovementioned steps among the SDP Offer, comprise the address, port, code/decode format of media resource etc.For example, suppose that MGW1 had both supported the T.38 fax based on Real-time Transport Protocol, support the ET.38 fax based on Real-time Transport Protocol again, then in this step, MGC1 can comprise ability description as follows in the SDP Offer that MGC2 sends:

v＝0

o＝-11IN?IP4mp1.example1.com

s＝-

c＝IN?IP4mp1.example1.com

t＝00

m＝audio?5764RTP/AVP?98?99

a＝rtpmap:98et38/8000

a＝rtpmap:99t38/8000

a＝fmtp:99?T38FaxVersion＝2；T38FaxRateManagement＝transferredTCF

According to SIP and SDP agreement, aforementioned capabilities is described expression: it is mp1.example1.com that this SDP provides the address of end, supports that on port 5764 code/decode format is et38 and t38, the equal 8000Hz of clock frequency and the audio service that adopts Real-time Transport Protocol to transmit.

Step 804:MGC2 sends the Add order to MGW2, specifies MGW2 to create ET.38 media resource end points, and comprises the media capability information of MGW1 in order.

Step 805:MGW2 creates the media resource end points, and returns the Add response message of other information such as the media capability information of carrying the media resource end points of creating to some extent, code/decode format, address, port to MGC2.

Step 806:MGC2 returns 200 OK response messages to MGC1, and carries the media negotiation result in this response message.

In this step, corresponding to the INVITE request message in the step 803, returning 200 OK response messages with MGC2 to MGC1 is that example describes, in actual applications, as previously mentioned, any message corresponding with the INVITE request message, can carry SDPAnswer in a SDP Offer/Answer process all can be used as the message that MGC2 returns to MGC1 in this step.

In this step, in 200 OK response messages, carry SDP Answer, carry the media negotiation result among the SDP Answer, for example, whether use ET.38 to carry out facsimile service etc., wherein may comprise the media processing capacity information of part or all of MGW2.

Suppose that MGW2 supports the ET.38 fax based on RTP, and also wish to use ET.38 to carry out facsimile service that MGC2 can return following SDP Answer to MGC1 so:

v＝0

o＝-11IN?IP4mp2.example2.com

s＝-

c＝IN?IP4mp2.example2.com

t＝00

m＝audio?10000RTP/AVP?98

a＝rtpmap:98et38/8000

Above-mentioned SDP Answer represents: responding terminal uses the address to set up based on the code/decode format of the Real-time Transport Protocol fax bearer path as ET.38 with end is provided for 10000 as mp2.example2.com, port, and carries out the transmission of fax service data, provides facsimile service for the user.

Step 807:MGC1 sends the Mod order according to received SDP Answer to MGW1, to upgrade the distant end media resource information.

In this step, MGC1 will upgrade the distant end media resource information to MGW1 according to the media negotiation result among the SDP Answer.

Step 808:MGC1 returns ACK message to MGC2.

Step 809:MGC1 receives the Mod response message of MGW1.

Step 810:MGW1 and MGW2 carry out the business of ET.38 facsimile service or other types according to the media negotiation result.

In this step, if the ET.38 that is to use that returns among the SDP Answer that carries in the aforementioned 200 OK response messages sets up the fax bearer path, then will be between MGW1 and the MGW2 according to the foundation of bearer path of faxing of ET.38 agreement, and carry out facsimile service communication.

So far, finish to realize in the embodiment of the invention two method flow of ET.38 facsimile service.

More than describe the embodiment that realizes ET.38 facsimile service method in the embodiment of the invention two in detail, below in conjunction with realizing the device of ET.38 facsimile service and the embodiment of system in the description of drawings embodiment of the invention two.

Fig. 9 is that the system that realizes the ET.38 facsimile service in the embodiment of the invention two forms structural representation.Referring to Fig. 9, this system comprises: MGC 910, the one is terminal 920 and the 2nd terminal 930 H.248 H.248;

Wherein, MGC 910, be used for respectively to the one H.248 terminal 920 and the 2nd H.248 terminal 930 send and the H.248 relevant order of medium processing of terminal, and, set up terminal 920 and the 2nd a fax bearer path between the terminal 930 H.248 H.248 according to the ET.38 agreement in a terminal 920 and the 2nd when H.248 terminal 930 all possesses the ET.38 ability H.248;

The one terminal 920 and the 2nd terminal 930 H.248 H.248 is used for separately himself ET.38 ability information is carried on the corresponding response message of mentioned order and sends to MGC 910.

In the system shown in Figure 9, MGC 910 can to the one H.248 terminal 920 and the 2nd H.248 terminal 930 send the audit order, the one H.248 terminal 920 and the 2nd H.248 terminal 930 the ET.38 ability information of himself can be carried in the audit response message and send to MGC 910;

Or, MGC 910 can to the one H.248 terminal 920 and the 2nd H.248 terminal 930 send the interpolation order of specifying the media resource code/decode format of creating, the one H.248 terminal 920 and the 2nd H.248 terminal 930 the ET.38 ability information of himself can be carried in the interpolation response message and send to MGC 910;

Or, MGC 910 can to the one H.248 terminal 920 and the 2nd H.248 terminal 930 send the interpolation order of the media resource of specify creation ET.38 code/decode formats, the one H.248 terminal 920 and the 2nd H.248 terminal 930 the ET.38 ability information of himself can be carried on to add in the response message and send to MGC 910;

Or, MGC 910 can to the one H.248 terminal 920 and the 2nd H.248 terminal 930 send the Mod order of revising media resources, the one H.248 terminal 920 and the 2nd H.248 terminal 930 the ET.38 ability information of himself can be carried on to revise in the response message and send to MGC 910;

Or, MGC 910 can to the one H.248 terminal 920 and the 2nd H.248 terminal 930 send the Mov order of mobile end points, the one H.248 terminal 920 and the 2nd H.248 terminal 930 the ET.38 ability information of himself can be carried on and send to MGC 910 in the mobile response message.

In the system shown in Figure 9, the one H.248 terminal 920 and the 2nd H.248 terminal 930 can be same MGC control down two terminal H.248, also can be two MGC under controlling two terminal H.248.In actual applications, when the one H.248 terminal 920 and the 2nd H.248 terminal 930 be under two MGC control two and will have two MGC in this system H.248 during terminal, further need carry out media capability negotiation between these two MGC.

Can adopt Session Initiation Protocol to carry out the ET.38 media capability negotiation between two MGC, at this moment, H.248 terminal under MGC and the control thereof will provide end as the SDP of SIP session, H.248 terminal under another MGC and the control thereof will be as the SDP responding terminal of SIP session, therefore, here two MGC are called SDP end MGC and SDP responding terminal MGC are provided, two H.248 terminal be called SDP and provide and hold H.248 H.248 terminal of terminal and SDP responding terminal.It is identical that the process of carrying out the ET.38 media capability negotiation based on Session Initiation Protocol between two MGC and embodiment one carry out the ET.248 ability based on Session Initiation Protocol, that is:

SDP among two MGC provides end MGC, SDP is provided hold H.248 that the ET.38 ability information of terminal is carried among the SDP Offer, sends to SDP responding terminal MGC;

SDP responding terminal MGC among two MGC provides the H.248 ET.38 ability of terminal of the ET.38 ability information of holding terminal H.248 and SDP responding terminal according to described SDP, provides end MGC to return SDP Answer to described SDP.

SDP provides end MGC to carry SDP Offer by the INVITE request message, and SDP responding terminal MGC can be by carrying SDP Answer to Temporary Response message this INVITE request message, except that 100 response messages;

Or SDP provides end MGC to carry SDP Offer by the INVITE request message, and SDP responding terminal MGC can carry SDPAnswer by the success response message to this INVITE request message;

Or SDP provides end MGC to carry SDPOffer by the success response message to INVITE, and SDP responding terminal MGC can carry SDPAnswer by the ACK message to this success response message;

Or, SDP provide the end MGC can be by reliable Temporary Response message INVITE, except that 100 response messages be carried SDP Offer, SDP responding terminal MGC can carry SDP Answer by the PRACK message to this Temporary Response message;

Or SDP provides end MGC to carry SDP Offer by the PRACK message to reliable Temporary Response message, and SDP responding terminal MGC can carry SDP Answer by the success response message to this PRACK message;

Or SDP provides end MGC to carry SDP Offer by the UPDATE request message, and SDP responding terminal MGC can carry SDPAnswer by the success response message to this UPDATE request message.

Figure 10 is that structural representation is formed in the inside of MGC in the system shown in Figure 9.Referring to Figure 10, this MGC comprises: order generation module 1001, MGC interface module 1002 are connected with MGC sets up module 1003.

Wherein, order generation module 1001 is used to generate and the H.248 relevant order of terminal media processing, and passes through MGC interface module 1002 to H.248 terminal transmission;

MGC interface module 1002 is used for sending with terminal media H.248 to terminal H.248 and handles relevant order, and the response message of the ET.38 ability information of terminal that carries H.248 that will come from terminal H.248 sends to the MGC connection and sets up module 1003;

Module 1003 is set up in the MGC connection, is used for the H.248 ET.38 ability of terminal of basis, sets up the H.248 fax bearer path between the terminal according to the ET.38 agreement.

And order generation module 1001 is that generated handles the ET.38 ability information that can specify local terminal or far-end in the relevant order with terminal media H.248;

The above-mentioned response message that carries the ET.38 ability information of described H.248 terminal is: carry and the corresponding code/decode type of ET.38 ability, and with the response message of the corresponding address of described code/decode type, port information.

Further, order generation module 1001 can be used for sending the audit order to MGC interface module 1002;

Or, send the interpolation order of not specifying the media resource code/decode format of creating to MGC interface module 1002;

Or, send the interpolation order of the media resource of specify creation ET.38 code/decode format to MGC interface module 1002;

Or, send the Mod order of revising media resource to MGC interface module 1002;

Or, send the Mov order of mobile end points to MGC interface module 1002.

Can further include the media capability negotiation module among the MGC shown in Figure 10, this media capability negotiation module can be used for carrying out media capability negotiation by Session Initiation Protocol and opposite end MGC.

Figure 11 be in the system shown in Figure 9 H.248 the inside of terminal form structural representation.Referring to Figure 11, this H.248 terminal comprise: H.248 terminal interface module 1101, response generation module 1102 are connected with terminal H.248 and set up module 1103.

Wherein, H.248 terminal interface module 1101, are used to receive come from MGC handle relevant order with medium terminal H.248, send to and respond generation module 1102, and will come from the response message that responds generation module 1102 and send to MGC;

Response generation module 1102, be used for will be H.248 the ET.38 ability information of terminal be carried on the corresponding response message of described order and send to H.248 terminal interface module 1101, and with this H.248 the ET.38 ability of terminal notify H.248 terminal to connect to set up module 1103;

H.248 module 1103 is set up in the terminal connection, is used for setting up the fax bearer path according to the ET.38 agreement.

Further, response generation module 1102 can also be used for that the ET.38 ability information of terminal H.248 is carried on the audit response message and send to H.248 terminal interface module 1101;

Or, the ET.38 ability information of terminal H.248 is carried on to add in the response message sends to H.248 terminal interface module 1101;

Or, the ET.38 ability information of terminal H.248 is carried on to revise in the response message sends to H.248 terminal interface module 1101;

Or, the ET.38 ability information of terminal H.248 is carried on sends to H.248 terminal interface module 1101 in the mobile response message.

As seen from the above-described embodiment, disclosed in this invention H.248 the realization between the terminal in the technical scheme of ET.38 facsimile service, by in SDP, describing the H.248 ET.38 ability of terminal, make MGC can obtain the ET.38 ability of MGW by command mechanism H.248, and support the ET.38 ability H.248 set up ET.38 fax bearer path between the terminal, thereby realized providing ET.38 facsimile service based on agreement H.248.

More than by two embodiment how to describe in detail based on SIP, H.248 agreement is supported the realization of ET.38 facsimile service, more specifically use below by the instantiation explanation technical solution of the present invention that a Wideband Code Division Multiple Access (WCDMA) inserts in (WCDMA) network.

Embodiment three:

The core net of WCDMA from circuit switching (CS) mode of R99 to packet-based soft switch evolution, be divided into R4 bearer independent core net (BICN), two stages of R5IP IP multimedia subsystem, IMS (IMS), the former is based on bearer independent call control (BICC) and agreement H.248, be intended to packetizing WCDMA CS territory, save the whole cost of voice service; The latter is core technology with the Session Initiation Protocol, and purpose provides abundant multimedia communication service, for operator brings new professional revenue source.At present R4 BICN to based on SIP and H.248 the network and the correlation technique of agreement study, technical solution of the present invention will solve well based on SIP and the problem of realization ET.38 facsimile service in the WCDMA network of agreement H.248.

Figure 12 is a method flow schematic diagram of realizing the ET.38 facsimile service in the embodiment of the invention three.Referring to Figure 12, MSC1 and MSC2 are respectively the mobile switching centre at the two ends of communicating by letter, GMSC is a gateway MSC, MGW1/IWF1 and MGW2/IWF2 are respectively the media gateway device and the intercommunication function unit at the two ends of communicating by letter, RNC1/BSC1 and RNC2/BSC2 are respectively the wireless network control apparatus and the base station at the two ends of communicating by letter, and UE1 and UE2 are respectively the subscriber terminal equipment at the two ends of communicating by letter.Use Session Initiation Protocol to communicate between MSC shown in the figure and the MSC, between MSC and the GMSC, using H.248 between MSC and the local terminal MGW, agreement communicates.

Method shown in Figure 12 may further comprise the steps:

Step 1201:UE1 initiates the facsimile call request to UE2.

Step 1202:MSC1 arrives the gateway resource of called gateway according to the calling of UE1 to MGW1 application caller gateway, and obtains the ability information of MGW1, comprising the ET.38 ability information.

In this step, MSC1 obtains the method for MGW1 ability information and embodiment two, and to realize that based on agreement H.248 MGC obtains the flow process of MGW ability identical, sees also the description of embodiment two corresponding parts, do not repeat them here.

After this, MSC1 can be according to providing the identical method of end to send SDP Offer to MSC2 with SDP among the embodiment one.For example, can use INVITE request message or other message, initiate medium foundation request to MSC2 by GMSC, and the ability information of in this request, carrying MGW1 and UE1, comprising the ET.38 ability information.

Step 1203:MSC2 calling user carries out security credential, and to the UE2 request of making a call.

Step 1204:MSC2 applies for called gateway resource according to MSC1 request to MGW2, and obtains the ability information of MGW2, comprising the ET.38 ability information.

In this step, MSC2 obtains among the method for MGW2 ability information and the embodiment two that to realize that based on agreement H.248 MGC obtains the flow process of MGW ability identical, sees also the description of embodiment two corresponding parts, does not repeat them here.Similar with embodiment two, MSC2 can obtain the media capability information of MGW2 in this step, also can obtain the media capability information of MGW2 in other suitable information interactive process before this step, in the present embodiment this is not limited.

MSC2 gets access to after the MGW2 ability information, can reply the INVITE of MSC1 according to the ability of MGW2 and UE2.Here, between MSC2 and the MSC1 based on identical among the capability negotiation process of Session Initiation Protocol and the embodiment one based on the capability negotiation process of Session Initiation Protocol, see also the description of embodiment one appropriate section, do not repeat them here.

To media gateway resource between the calling terminal and air interface resource, MSC2 applies for that to RNC2/BSC2 called gateway is to media gateway resource between the terminal called and air interface resource to step 1205:MSC1 to RNC1/BSC1 application caller gateway.

Step 1206:MSC1 notice MSC2 Calling Side media resource reservation is finished.

Step 1207: called facsimile terminal is replied, and UE2 sends response message to MSC2.

After step 1208:MSC2 receives the 200OK message of MSC1, send response message to UE1.

Above-mentioned steps 1205 fax initiation process to performed operation of step 1208 and the existing WCDMA R4 network is identical, and to technical solution of the present invention without any influence, therefore, be omitted herein.

After above-mentioned facsimile call is set up successfully, just the ET.38 facsimile service can have been carried out between the calling and called terminal.According to prior art, when UE1 is the WCDMA terminal, uses ET.38 to carry out facsimile service between UE1 and the MGW1/IWF1 and communicate by letter, when UE2 is the WCDMA terminal, uses ET.38 to carry out facsimile service between UE2 and the MGW2/IWF2 and communicate by letter.When UE1, UE2 are the WCDMA terminal, between UE1 and the MGW1/IWF1, between MGW1/IWF1 and the MGW2/IWF2 and can use ET.38 to carry out facsimile service between UE2 and the MGW2/IWF2, MGW/IWF gets final product with regard to only carrying out simple ET.38 business data packet forwarding like this, thereby reduce the conversion between the unnecessary code/decode format, not only can reduce the load of MGW/IWF, can reduce the time delay of fax service data transmission and the quality that improves fax because of the distortion of the business datum that the conversion between the code/decode format causes simultaneously.

Use the disclosed technical scheme of the embodiment of the invention, can be various based on Session Initiation Protocol and/or H.248 realize the mutual of ET.38 ability in the protocol of I P network application and consult, and the foundation of ET.38 fax bearer path, this not only solved based on Session Initiation Protocol and H.248 agreement can not provide the ET.38 facsimile service this technical problem, and, for the Fax over IP field, have unusual meaning.This be because: on the one hand, the ET.38 facsimile protocol can be operated under cable network and the mobile network environment well, promptly can overcome other facsimile protocols and can not be operated in this shortcoming under the mobile network environment, and mobile network's application will be very general; On the other hand, Session Initiation Protocol and H.248 agreement be respectively of paramount importance application layer control protocol and MGCP in the next generation network, based on Session Initiation Protocol and H.248 the application of agreement with ubiquitous, this shows, the present invention has realized the facsimile service among the mobile network and Session Initiation Protocol and combining of agreement H.248, has promoted the progress in Fax over IP field.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a method that realizes the ET.38 facsimile service between the Session initiation protocol SIP terminal is characterized in that, expansion and the corresponding code/decode type of ET.38 ability in advance, and this method is further comprising the steps of:

Session Description Protocol SDP provides end that himself ET.38 ability information is carried on SDP and provides among the Offer, sends to the SDP responding terminal; Wherein, described SDP provides end with the mode that himself ET.38 ability information is carried among the SDP Offer to be: in described SDP Offer, carry described and the corresponding code/decode type of ET.38 ability, and with the corresponding address of described code/decode type, port information;

If the media negotiation result among the described SDP Answer is for setting up ET.38 fax bearer path, then described SDP provides end and described SDP responding terminal to set up the fax bearer path according to the ET.38 agreement; Wherein, the media negotiation result among the described SDP Answer is: comprise described and the corresponding code/decode type of ET.38 ability, and with the media negotiation result of the corresponding address of described code/decode type, port information.

2. method according to claim 1 is characterized in that, described expansion and the corresponding code/decode type of ET.38 ability are: definition multipurpose internet mail expansion MIME medium type and MIME subtype;

Described MIME subtype represents that the code/decode format of described MIME medium type is an ET.38 protocol encoding and decoding form.

3. method according to claim 1, it is characterized in that, described SDP provides end to comprise media processing units MP and media control unit MC, described MP and MC are two independently physical equipments, comprise further that described MC obtained the operation of the ET.38 ability information of described MP before described SDP provides the described SDP Offer of end transmission.

4. method according to claim 1, it is characterized in that, described SDP responding terminal comprises media processing units MP and media control unit MC, described MP and MC are two independently physical equipments, comprise further that before described SDP responding terminal is returned described SDP Answer described MC obtains the operation of the ET.38 ability information of described MP.

5. method according to claim 1, it is characterized in that, described SDP provides end to comprise media processing units MP and media control unit MC, described MP and MC are two independently physical equipments, comprise further that described MC obtained the operation of the ET.38 ability information of described MP before described SDP provides the described SDP Offer of end transmission;

Described SDP responding terminal comprises MP and MC, and described MP and MC are two independently physical equipments, comprises further that before described SDP responding terminal is returned described SDP Answer described MC obtains the operation of the ET.38 ability information of described MP.

6. according to the arbitrary described method of claim 3 to 5, it is characterized in that described MC adopts agreement H.248 to obtain the ET.38 ability information of described MP, described MC obtains being operating as of ET.38 ability information of described MP:

Described MC sends with the medium of MP to described MP and handles relevant order;

Described MP with himself ET.38 ability information be carried on the corresponding response message of described order in send to described MC.

7. method according to claim 6 is characterized in that,

The described order relevant with the medium processing of MP is: carry the order with the corresponding code/decode type of ET.38 ability;

Described MP with the mode that himself ET.38 ability information is carried in the response message is: carry described and the corresponding code/decode type of ET.38 ability in described response message.

8. method according to claim 7 is characterized in that, described expansion and the corresponding code/decode type of ET.38 ability are: definition multipurpose internet mail expansion MIME medium type and MIME subtype;

9. according to the arbitrary described method of claim 1 to 5, it is characterized in that described SDP Offer is carried in the INVITE request message, described SDP Answer is carried in the Temporary Response message described INVITE request message, except that 100 response messages;

Or described SDP Offer is carried in the INVITE request message, and described SDP Answer is carried in the success response message to described INVITE request message;

Or described SDP Offer is carried in the success response message to INVITE, and described SDPAnswer is carried in the ACK message to the success response message of described INVITE;

Or, described SDP Offer is carried in reliable Temporary Response message INVITE, except that 100 response messages, and described SDP Answer is carried in the affirmation PRACK message to reliable Temporary Response message described INVITE, except that 100 response messages;

Or described SDP Offer is carried in the PRACK message to reliable Temporary Response message, and described SDP Answer is carried in the success response message to the PRACK message of described reliable Temporary Response message;

Or described SDP Offer is carried in the UPDATE request message, and described SDP Answer is carried in the success response message to described UPDATE request message.

10. method according to claim 8 is characterized in that, described SDP Offer is carried in the INVITE request message, and described SDP Answer is carried in the Temporary Response message described INVITE request message, except that 100 response messages;

11. method according to claim 8 is characterized in that, the described order relevant with the medium processing of MP is: the audit order, and order corresponding response message to be with described audit: the audit response message;

Or the described order relevant with the medium processing of MP is: add the Add order, order corresponding response message to be with described interpolation: add response message;

Or the described order relevant with the medium processing of MP is: revise the modification Mod order of media resource, order corresponding response message to be with described modification: to revise response message;

Or the described order relevant with the medium processing of MP is: the mobile Mov order of mobile end points with the corresponding response message of described movement directive is: mobile response message.

12. one kind in the method that H.248 realizes the ET.38 facsimile service between the terminal, it is characterized in that, and expansion and the corresponding code/decode type of ET.38 ability in advance, this method is further comprising the steps of:

Media gateway controller MGC sends with the medium of described H.248 terminal to described H.248 terminal respectively and handles relevant order; Wherein, describedly handle relevant order with the medium of terminal H.248 and be: carry order with the corresponding code/decode type of ET.38 ability;

Described H.248 terminal respectively himself ET.38 ability information is carried on the corresponding response message of described order in send to described MGC; Described H.248 terminal with the mode that himself ET.38 ability information is carried in the response message is: carry described and the corresponding code/decode type of ET.38 ability in described response message;

13. method according to claim 12 is characterized in that, described H.248 terminal is under the same MGC control two H.248 terminals.

14. method according to claim 12, it is characterized in that, described H.248 terminal is under two MGC control two H.248 terminals, and before described MGC sets up the described H.248 fax bearer path between the terminal, further comprise: described two MGC carry out media capability negotiation.

15. method according to claim 14 is characterized in that, described two MGC adopt Session Initiation Protocol to carry out described media capability negotiation, and described media capability negotiation may further comprise the steps:

SDP among described two MGC provides end MGC that SDP is provided and holds H.248 that the ET.38 ability information of terminal is carried among the SDP Offer, sends to SDP responding terminal MGC;

SDP responding terminal MGC among described two MGC provides the H.248 ET.38 ability of terminal of the ET.38 ability information of holding terminal H.248 and SDP responding terminal according to described SDP, provides end MGC to return SDP Answer to described SDP.

16. method according to claim 15 is characterized in that,

Described SDP provides end with the mode that himself ET.38 ability information is carried among the SDP Offer to be: in described SDP Offer, carry described and the corresponding code/decode type of ET.38 ability, and with the corresponding address of described code/decode type, port information;

Media negotiation result among the described SDP Answer is: comprise described and the corresponding code/decode type of ET.38 ability, and with the media negotiation result of the corresponding address of described code/decode type, port information.

17., it is characterized in that described expansion and the corresponding code/decode type of ET.38 ability are according to each described method of claim 12 to 16: definition MIME medium type and MIME subtype;

18. according to the arbitrary described method of claim 12 to 16, it is characterized in that, describedly handle relevant order with the medium of terminal H.248 and be: the audit order, order corresponding response message to be with described audit: the response message of auditing;

Or, describedly handle relevant order with the medium of terminal H.248 and be: add order, order corresponding response message to be: the interpolation response message with described interpolation;

Or, describedly handle relevant order with the medium of terminal H.248 and be: revise the Mod order of media resource, order corresponding response message to be: the modification response message with described modification;

Or describedly handle relevant order with the medium of terminal H.248 and be: the Mov of mobile end points orders, and with the corresponding response message of described movement directive is: mobile response message.

19. method according to claim 18 is characterized in that,

Described interpolation order is: specifying the media resource of being created is described and the corresponding code/decode type of ET.38 ability, and the interpolation order of appointment and the corresponding address of described code/decode type, port information, or do not specify the interpolation order of the media resource type of being created;

The Mod order of described modification media resource is: specify local terminal to adopt the described and corresponding code/decode type of ET.38 ability, or far-end is supported the described and corresponding code/decode type of ET.38 ability, and the modification order of appointment and the corresponding address of described code/decode type, port information, or do not specify local terminal to adopt and/or the modification order of far-end support media resource type;

The Mov order of described mobile end points is: specify local terminal to adopt the described and corresponding medium type of ET.38 ability, or far-end is supported the described and corresponding medium type of ET.38 ability, and the movement directive of appointment and the corresponding address of described medium type, port, or do not specify local terminal to adopt and/or the modification order of far-end support media resource type.

20. a system that realizes the ET.38 facsimile service between sip terminal, this system comprises: SDP provides end device and SDP responding terminal device, it is characterized in that,

Described SDP provides end device, be used for carrying and himself the corresponding code/decode type of ET.38 ability at SDP Offer, and with the corresponding address of described code/decode type, port information, and send described SDP Offer, and receive the SDP Answer that carries the media negotiation result that comes from described SDP responding terminal device to described SDP responding terminal device;

Described SDP responding terminal device, be used to receive and come from the SDPOffer that described SDP provides end device, and provide the ET.38 ability information of end device and the ET.38 ability of described SDP responding terminal device self according to the described SDP among the described SDP Offer, media negotiation result's SDP Answer is provided end device to return to carry to described SDP; Wherein, the media negotiation result among the described SDP Answer is: comprise described and the corresponding code/decode type of ET.38 ability, and with the media negotiation result of the corresponding address of described code/decode type, port information;

21. system according to claim 20 is characterized in that, described SDP provides end device to be further used for judging that media negotiation result among the described SDP Answer is whether for setting up ET.38 fax bearer path.

22. system according to claim 20, it is characterized in that, when described SDP provides end to be made of separate media processing units MP and media control unit MC, described MC is used for sending the relevant order of medium processing with MP to described MP, and described MP is used for himself ET.38 ability information is carried on the corresponding response message of described order and sends to described MC.

23. system according to claim 20, it is characterized in that, when described SDP responding terminal is made of separate media processing units MP and media control unit MC, described MC is used for sending the relevant order of medium processing with MP to described MP, and described MP is used for himself ET.38 ability information is carried on the corresponding response message of described order and sends to described MC.

24. system according to claim 20, it is characterized in that, when described SDP provides end to be made of separate media processing units MP and media control unit MC, described MC is used for sending the relevant order of medium processing with MP to described MP, and described MP is used for himself ET.38 ability information is carried on the corresponding response message of described order and sends to described MC;

When described SDP responding terminal is made of separate MP and MC, described MC is used for sending the relevant order of medium processing with MP to described MP, and described MP is used for himself ET.38 ability information is carried on the corresponding response message of described order and sends to described MC.

25. according to the arbitrary described system of claim 20 to 24, it is characterized in that, described SDP provides end device to carry described SDP Offer by the INVITE request message, and described SDP responding terminal device is by carrying described SDP Answer to Temporary Response message described INVITE request message, except that 100 response messages;

Or described SDP provides end device to carry described SDP Offer by the INVITE request message, and described SDP responding terminal device is by carrying described SDP Answer to the success response message of described INVITE request message;

Or described SDP provides end device by the success response message of INVITE is carried described SDP Offer, and described SDP responding terminal device carries described SDP Answer by the ACK message to the success response message of described INVITE;

Or, described SDP provides end device by reliable Temporary Response message INVITE, except that 100 response messages are carried described SDP Offer, and described SDP responding terminal device is by carrying described SDP Answer to the PRACK message of reliable Temporary Response message described INVITE, except that 100 response messages;

Or described SDP provides end device by the PRACK message of reliable Temporary Response message is carried described SDP Offer, and described SDP responding terminal device carries described SDP Answer by the success response message to the PRACK message of described reliable Temporary Response message;

Or described SDP provides end device to carry described SDP Offer by the UPDATE request message, and described SDP responding terminal device is by carrying described SDP Answer to the success response message of described UPDATE request message.

26., it is characterized in that described MC is used for sending the audit order to described MP according to the arbitrary described system of claim 22 to 24, described MP is used for that himself ET.38 ability information is carried on the audit response message and sends to described MC;

Described MC is used for sending to described MP and adds order, and described MP is used for himself ET.38 ability information is carried on and adds response message and send to described MC;

Described MC is used for sending the Mod order of revising media resource to described MP, and described MP is used for himself ET.38 ability information is carried on and revises response message and send to described MC;

Described MC is used for sending to described MP the Mov order of mobile end points, and described MP is used for that himself ET.38 ability information is carried on mobile response message and sends to described MC.

27. a SDP who realizes the ET.38 facsimile service provides end device, this SDP provides end device to comprise: SDP Offer generation module, SDP provide end interface module and SDP to provide end to be connected and set up module, it is characterized in that,

Described SDP Offer generation module is used for providing the ET.38 ability of end device to generate according to described SDP and carries the SDP Offer that described SDP provides the ET.38 ability information of end, and sends to described SDP the end interface module is provided; Wherein, the described SDP that carries that described SDP Offer generation module is generated provides the SDP Offer of the ET.38 ability information of end to be: carry and the corresponding code/decode type of ET.38 ability, and with the SDPOffer of the corresponding address of described code/decode type, port information;

Described SDP provides the end interface module, and the SDP Offer that is used for coming from described SDP Offer generation module sends to SDP responding terminal device, and the SDPAnswer that described SDP responding terminal device returns is sent to described SDP provides end to connect to set up module;

Described SDP provides end to connect and sets up module, is used for according to coming from the described SDP Answer that described SDP provides the end interface module, sets up described SDP according to the ET.38 agreement fax bearer path between end device and the described SDP responding terminal device is provided;

Wherein, the media negotiation result among the SDP Answer is: comprise described and the corresponding code/decode type of ET.38 ability, and with the media negotiation result of the corresponding address of described code/decode type, port information.

28. SDP according to claim 27 provides end device, it is characterized in that, described SDP provides end to connect and sets up module, is further used for judging that whether media negotiation result among the described SDP Answer is for setting up ET.38 fax bearer path.

29. provide end device, it is characterized in that described SDP Offer generation module, the SDP Offer that is used for being generated are carried on the INVITE request message and send to described SDP the end interface module is provided according to claim 27 or 28 described SDP;

Or, the SDP Offer that is generated is carried on sends to described SDP in the success response message to INVITE the end interface module is provided;

Or the SDP Offer that is generated is carried on provides the end interface module to sending to described SDP in reliable Temporary Response message INVITE, except that 100 response messages;

Or, the SDP Offer that is generated is carried on sends to described SDP in the PRACK message to reliable Temporary Response message the end interface module is provided;

Or, the SDP Offer that is generated is carried on sends to described SDP in the UPDATE request message end interface module is provided.

30. a SDP responding terminal device of realizing the ET.38 facsimile service, this SDP responding terminal device comprises: SDP responding terminal interface module, SDP Answer generation module are connected with the SDP responding terminal sets up module, it is characterized in that,

Described SDP responding terminal interface module is used to receive and comes from SDP the SDPOffer of end device is provided, sends to described SDP Answer generation module, and the SDP Answer that will come from described SDP Answer generation module sends to described SDP end device is provided; Wherein, carry among the described SDP Offer and the corresponding code/decode type of ET.38 ability, and with the corresponding address of described code/decode type, port information;

Described SDP responding terminal connects sets up module, is used for according to described SDP Answer, sets up described SDP responding terminal device and described SDP provides the bearer path of the fax between the end device according to the ET.38 agreement;

31. SDP responding terminal device according to claim 30, it is characterized in that, described SDPAnswer generation module, the SDP Answer that is used for being generated are carried on the Temporary Response message INVITE request message, except that 100 response messages are sent to described SDP responding terminal interface module;

Or, the SDP Answer that is generated is carried in the success response message to the INVITE request message sends to described SDP responding terminal interface module;

Or, the SDP Answer that is generated is carried in the ACK message to the success response message of INVITE sends to described SDP responding terminal interface module;

Or, the SDP Answer that is generated is carried in the PRACK message to reliable Temporary Response message INVITE, except that 100 response messages sends to described SDP responding terminal interface module;

Or, the SDP Answer that is generated is carried in the success response message to the PRACK message of reliable Temporary Response message sends to described SDP responding terminal interface module;

Or, the SDP Answer that is generated is carried in the success response message to the UPDATE request message sends to described SDP responding terminal interface module.

32. one kind in the system that H.248 realizes the ET.38 facsimile service between the terminal, this system comprises: media gateway controller MGC, the one is terminal and the 2nd terminal H.248 H.248, it is characterized in that,

The described the one terminal and the 2nd terminal H.248 H.248, be used for separately with himself the corresponding code/decode type of ET.38 ability, and with the corresponding address of described code/decode type, port information is carried on the corresponding response message of described order in send to described MGC.

33. system according to claim 32 is characterized in that, the described the one H.248 terminal and the 2nd H.248 terminal be under the same MGC control two H.248 terminals.

34. system according to claim 32 is characterized in that, when the described the one H.248 terminal and the 2nd H.248 terminal be under two MGC control two H.248 during terminal, described two MGC are further used for carrying out media capability negotiation.

35. system according to claim 34 is characterized in that, described two MGC adopt Session Initiation Protocol to carry out described media capability negotiation;

SDP among described two MGC provides end MGC, is used for SDP provided holding H.248 that the ET.38 ability information of terminal is carried on SDP Offer, sends to SDP responding terminal MGC;

SDP responding terminal MGC among described two MGC is used for providing the H.248 ET.38 ability of terminal of the ET.38 ability information of holding terminal H.248 and SDP responding terminal according to described SDP, provides end MGC to return SDP Answer to described SDP.

36. according to the arbitrary described system of claim 32 to 35, it is characterized in that, described MGC is used for sending the audit order to described H.248 terminal, and described H.248 terminal is used for that himself ET.38 ability information is carried on the audit response message and sends to described MGC;

Or described MGC is used for sending to described H.248 terminal and adds order, and described H.248 terminal is used for himself ET.38 ability information is carried on adds response message and send to described MGC;

Or described MGC is used for sending the Mod order of revising media resource to described H.248 terminal, and described H.248 terminal is used for himself ET.38 ability information is carried on to be revised response message and send to described MGC;

Or described MGC is used for sending to described H.248 terminal the Mov order of mobile end points, and described H.248 terminal is used for that himself ET.38 ability information is carried on mobile response message and sends to described MGC.

37. system according to claim 36, it is characterized in that, described SDP provides end MGC to carry described SDP Offer by the INVITE request message, and described SDP responding terminal MGC is by carrying described SDP Answer to Temporary Response message described INVITE request message, except that 100 response messages;

Or described SDP provides end MGC to carry described SDP Offer by the INVITE request message, and described SDP responding terminal MGC is by carrying described SDP Answer to the success response message of described INVITE request message;

Or described SDP provides end MGC by the success response message of INVITE is carried described SDP Offer, and described SDP responding terminal MGC carries described SDP Answer by the ACK message to the success response message of described INVITE;

Or, described SDP provides end MGC by reliable Temporary Response message INVITE, except that 100 response messages are carried described SDP Offer, and described SDP responding terminal MGC is by carrying described SDP Answer to the PRACK message of reliable Temporary Response message described INVITE, except that 100 response messages;

Or described SDP provides end MGC by the PRACK message of reliable Temporary Response message is carried described SDP Offer, and described SDP responding terminal MGC carries described SDP Answer by the success response message to the PRACK message of described reliable Temporary Response message;

Or described SDP provides end MGC to carry described SDP Offer by the UPDATE request message, and described SDP responding terminal MGC is by carrying described SDP Answer to the success response message of described UPDATE request message.

38. a media gateway controller MGC that realizes the ET.38 facsimile service, this MGC comprises: order generation module, MGC interface module are connected with MGC sets up module, it is characterized in that,

Described order generation module is used to generate and the H.248 relevant order of terminal media processing, and sends to described H.248 terminal by described MGC interface module; Wherein, described and terminal media are H.248 handled the ET.38 ability information of appointment local terminal in the relevant order or far-end;

Described MGC interface module, be used for sending and the relevant order of described H.248 terminal media processing to described H.248 terminal, and will come from the corresponding code/decode type of ET.38 ability with described H.248 terminal of carrying of described H.248 terminal, and send to described MGC with the response message of the corresponding address of described code/decode type, port information and be connected and set up module;

39., it is characterized in that described MGC further comprises the media capability negotiation module according to the described MGC of claim 38;

Described media capability negotiation module is used for carrying out media capability negotiation by Session Initiation Protocol and opposite end MGC.

40., it is characterized in that described order generation module is used for sending the audit order to described MGC interface module according to claim 38 or 39 described MGC;

Or, send the interpolation order of not specifying the media resource code/decode format of creating to described MGC interface module;

Or, send the interpolation order of the media resource of specify creation ET.38 code/decode format to described MGC interface module;

Or, send the Mod order of revising media resource to described MGC interface module;

Or, send the Mov order of mobile end points to described MGC interface module.

41. a H.248 terminal that realizes the ET.38 facsimile service, this H.248 terminal comprise: H.248 terminal interface module, response generation module are connected with terminal H.248 and set up module, it is characterized in that,

Described H.248 terminal interface module, be used to receive and come from medium media gateway controller MGC and described H.248 terminal and handle relevant order, send to described response generation module, and the response message that will come from described response generation module sends to described MGC;

Described response generation module, be used for will with the corresponding code/decode type of ET.38 ability of described H.248 terminal, and with the corresponding address of described code/decode type, port information is carried on the corresponding response message of described order in send to described H.248 terminal interface module, and notify described H.248 terminal to connect the ET.38 ability of described H.248 terminal and set up module;

42., it is characterized in that described response generation module is used for ET.38 ability information with described H.248 terminal and is carried on the audit response message and sends to described H.248 terminal interface module according to the described H.248 terminal of claim 41;

Or, the ET.38 ability information of described H.248 terminal is carried on to add in the response message sends to described H.248 terminal interface module;

Or, the ET.38 ability information of described H.248 terminal is carried on to revise in the response message sends to described H.248 terminal interface module;

Or, the ET.38 ability information of described H.248 terminal is carried on sends to described H.248 terminal interface module in the mobile response message.