CN1812559A - A H.323 terminal and method for video frequency communicating with H.324 terminal - Google Patents
A H.323 terminal and method for video frequency communicating with H.324 terminal Download PDFInfo
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- CN1812559A CN1812559A CN 200510002681 CN200510002681A CN1812559A CN 1812559 A CN1812559 A CN 1812559A CN 200510002681 CN200510002681 CN 200510002681 CN 200510002681 A CN200510002681 A CN 200510002681A CN 1812559 A CN1812559 A CN 1812559A
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Abstract
A method for making video interflow between H.323 TERMINAL AND H.324 terminal includes using video conversion gateway to control H.323 terminal to enter slow starting up mode, sending gateway ability information to calling and called terminals actively by said gateway and obtaining terminal ability information returned back from calling and called terminals, transmitting ability information of gateway and terminal down to terminals of both parties by said gateway and turning on channel between called terminals first then turning on channel between calling terminals for carrying out video interflow .
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of H.323 terminal and the method for terminal video interconnection H.324.
Background technology
Increasingly mature along with 3G technology, the function of support is enriched perfect day by day, and except the challenge of self-technique, the 3G commercial network also will be faced with the problem with other various existing network intercommunications.In the existing network, the development of packet network is particularly swift and violent, and legacy network is substituted by new packet network gradually, realizes that the intercommunication of 3G network and existing packet network is a current key point.Multimedia service is the bright spot of 3G, and wherein video traffic is behaved and know most, and 3G network commercial or on probation at present all provides video traffic.Simultaneously, H.323 (based on the multimedia communications system of message, Packet-based multimedia communicationssystems) network is as a kind of packet network, rely on himself technical advantage also can support the multimedia service that enriches, exist the H.323 terminal of a large amount of various support video traffics in the existing fixed network, being modal video terminal in the present fixed network, is exactly a kind of of H.323 terminal such as the NetMeeting that carries under the Windows operating system.Yet, because the Media Stream coded system of transmitting in 3G communication network and the packet communications network is different, therefore the binding site at 3G network and packet network needs codec that the Media Stream coded system is changed, realize this conversion equipment we be referred to as gateway, can realize the gateway of video traffic coded system conversion, be exactly the video transfer gateway.The position of video transfer gateway in network as shown in Figure 1.The 3G video terminal and H.323 terminal defer to H.324 and agreement H.323 unified in this article be referred to as " H.324 terminal " and " H.323 terminal " respectively.H.324 terminal is in the video call of terminal H.323 at one time, and the video transfer gateway is finished the conversion between H324 protocol suite and the H323 protocol suite, realizes H.324 terminal and the H.323 intercommunication of terminal.In call establishment, H.324 agreement and H.323 a common ground of protocol processes be, in the process of call setup, all need through capability negotiation, open the passage of carrying media stream then.
What H.323 agreement was different from agreement H.324 very more significantly is that H.323 dual mode can be selected to open soon and be opened slowly to terminal.What is called opens soon and is meant that H.323 terminal is when calling out beginning, capability negotiation and the transmission separately of information of opening passage, but in the request link setup message (ITU-T is Setup message Q.931) that the calling party sends, carry the information that the request callee opens the passage of carrying media stream by fastStart (opening soon) parameter.If mode is opened in the support of callee side terminal soon, the callee is in ALERTING message (ITU-T is Alerting message Q.931), call treatment message (ITU-T is Call Proceeding message Q.931), perhaps call out in the connection message (ITU-T is Connect message Q.931), carry the information of the passage of opening carrying media stream by the fastStart parameter, directly open passage, begin to be ready for sending media stream data.The way that another kind approaches to open soon mode is, the calling party is in request link setup message, will be H.225 parameter h245Tunneling (tunnelling function) in (based on the call signaling protocol and the Media Stream packing agreement of the multimedia communications system of message) message to be designated as be that the message of carrying H.245 agreement (call control protocol of multimedia communication) definition subsequently begins capability negotiation.The advantage of this dual mode is, saved the time of call setup to a great extent, reduced the interacting message number of times.What is called opens slowly and is meant that H.323 terminal is when calling out beginning, and capability negotiation must send separately after physical link is set up successfully with the information of opening passage, can not carry these information in call setup series message Q.931.H.324 terminal does not open and the branch that opens slowly soon, capability negotiation and open passage and must set up on the successful basis at physical link and send, and the time basic fixed of whole call establishment consumption does not almost have compressible leeway.
H.324 and H.323 intercommunication when, and H.323 terminal adopts when opening mode soon, usually H.323 the passage of side is opened Zao than the passage of side H.324, this is because in the video call, H.324 the bandwidth of terminal (being generally 64Kbps) is littler than the bandwidth (10M/100Mbps) that network H.323 provides, and H.323 adopt when opening mode soon, saved many message interaction process, H.323 the link setup speed between terminal and the gateway obviously wants fast a lot.Therefore, when the passage of side is H.323 opened, and when beginning to send video and speech data, because H.324 wing passage is opened laterly, can't receive video and speech data that side H.323 sends, causing H.323, the video and the voice of side are dropped.
For encoding and decoding speech, the relevance of front and back speech data encoding and decoding is very little, abandons the voice that begin a period of time most, do not influence the normal decoder of back voice, promptly in case H.324 side opened voice channel, both sides' voice call has just been set up, and fully normal.But, for Video Codec, the relation of front and back frame of video normally very closely, the decoding of back one frame video will depend on the decoded result of former frame video image usually, lost frame of video the last period that session begins, will badly influence the decoding of back video data, H.324 the user sees is exactly after video calling is set up, and H.323 the video image that sends of side has serious mosaic.If that Video Codec uses is MPEG-4, because beginning the codec of MPEG-4, session can transmit some important informations, in a single day these information lose, and more likely cause in the whole session process H.324 lateral root originally to can't see any image.Therefore, when terminal mutual H.324 and H.323, how to avoid lost-call to set up beginning data for the previous period, just become the problem that the video transfer gateway must solve.
In the prior art, the video transfer gateway is counted as two terminals, respectively separately and the H.323 terminal of both sides, H.324 terminal is held consultation; Do not distinguish opening soon and opening slowly H.323 for end side H.323, open gateway and H.323 terminal, the passage between the terminal H.324 respectively separately.Gateway and H.323 terminal negotiation, open passage and gateway and H.324 terminal negotiation, open and do not have any relevance between the passage.When terminal is H.323 used when opening mode soon, the same use of gateway open soon mode and H.323 terminal hold consultation, finish call setup.This method is because passage opening and begin to send media data early H.323 to such an extent as to the media data of Fa Songing is dropped at first, causes the decline of receiving terminal video quality, and perhaps video image can not show at all.
Summary of the invention
The invention provides a kind of H.323 terminal and the method for terminal video interconnection H.324, in order to solve in the prior art H.323 terminal and terminal H.324 respectively as calling and called, when H.323 the terminal employing is opened mode soon, the moment of opening owing to session channel, the variant video quality that causes descended, perhaps the image problem that can not show.
H.323 the terminal provided by the invention and the method for terminal video interconnection H.324, described H.323 terminal is with H.324 terminal is by the intercommunication of video transfer gateway, and this method comprises the following steps:
H.323 A, video transfer gateway are controlled, and terminal enters the mode that opens slowly;
B, video transfer gateway initiatively send the gateway ability information to caller and terminal called, and obtain the terminal ability information that caller and terminal called return;
Give both sides' terminal under C, video transfer gateway the ability information that gateway and terminal is common, and open earlier and terminal called between passage after open again and calling terminal between passage, carry out video interconnection.
In the described steps A, H.323 terminal is caller and please seeks quickness when opening mode, and the video transfer gateway indicates it not support to open function soon in receiveing the response, and forcing H.323, terminal enters the mode that opens slowly.
According to said method of the present invention, if H.323 terminal is carried in request link setup message and is opened parameter request soon and open mode soon, then the video transfer gateway send to terminal H.323 receive the response in do not carry and open parameter soon, indicate it not support to open soon function;
If H.323 terminal in request link setup message H.225 the h245 parameters for tunnel in the message be changed to enable to seek quickness and open mode, then the video transfer gateway is changed to its h245 parameters for tunnel in the H.225 message of H.323 terminal transmission and does not enable, and indicates it not support to open soon function.
In the described steps A, when H.323 terminal is called, the video transfer gateway in sending to the request link setup message of terminal H.323 indication its do not support to open function soon, forcing H.323, terminal enters the mode that opens slowly.
According to said method of the present invention, the video transfer gateway does not carry in sending to the request link setup message of terminal H.323 and opens parameter soon; And/or the video transfer gateway is changed to its h245 parameters for tunnel in the H.225 message that terminal H.323 sends and do not enable, and indicates it not support to open soon function.
Be meant for both sides' terminal under the transfer gateway of video described in the step C the ability information that gateway and terminal is common: video transfer gateway and the total ability information of calling terminal are handed down to calling terminal; And the ability information that video transfer gateway and terminal called is total is handed down to terminal called; Perhaps that video transfer gateway, calling terminal and terminal called is total ability information is handed down to caller and terminal called respectively.
According to said method of the present invention, the present invention make gateway and H.323 terminal negotiation, open passage and gateway and H.324 terminal negotiation, open and have relevance between the passage.That is: use when opening mode soon when terminal H.323, H.323 the present invention forces that terminal enters the mode that opens slowly, and preferentially sets up the callee side passage, makes the callee side passage open prior to the Calling Side passage.When so having solved in the prior art H.324 terminal effectively and having opened under the mode H.323 terminal mutual soon, lose the data at the beginning of the session, cause image quality decrease, perhaps the image problem that can not show.
Description of drawings
Figure 1 shows that the position view of video transfer gateway in network;
Figure 2 shows that H.323 terminal is as calling party's operating process schematic diagram;
Figure 3 shows that H.323 terminal is as callee's operating process schematic diagram;
Figure 4 shows that the inventive method flow chart of steps.
Embodiment
Referring to Fig. 2, for the present invention H.323 terminal as calling party's operating process schematic diagram.Its idiographic flow is as follows:
When terminal is H.323 called out callee side H.324 during terminal as Calling Side, H.323 terminal at first sends to a request of video transfer gateway link setup message (ITU-T is Setup message Q.931), in this message, carry soon and open (fastStart) parameter, represent that this terminal support opens mode soon, and desire to carry out transfer of data to open mode soon; After the video transfer gateway is received this request link setup message, send ALERTING message (ITU-TQ.931 Alerting message), call treatment message (ITU-T is Call Proceeding message Q.931) and calling connection message (ITU-T is Connect message Q.931) to terminal H.323, all do not carry the fastStart parameter in above-mentioned three kinds of message, forcing H.323, terminal enters the mode that opens slowly.
If H.323 terminal is in request link setup message, H.225 h245Tunneling (tunnel) parameter in the message is changed to enables, please seek quickness in this kind mode and to open, after the video transfer gateway is received this request link setup message, in receiveing the response, H.225 the h245Tunneling parameter in the message is changed to do not enable, indicate this video transfer gateway not support H.245 tunnelling function, forcing H.323, terminal enters the mode that opens slowly.
When the video transfer gateway make Calling Side H.323 terminal with after opening mode slowly and setting up link, respectively with H.323 terminal, the called H.324 terminal negotiations process that begins H.245 to stipulate of caller.At first carrying out the principal and subordinate determines; After finishing, the video transfer gateway initiatively sends the gateway ability information to the calling and called terminal, after the calling and called terminal is received the gateway ability information that the video transfer gateway sends, sends response message to the video transfer gateway respectively, and ability information separately; Collect neat caller H.323 after the ability information of terminal, called H.324 terminal at the video transfer gateway, ask for the common factor of gateway ability information and calling and called terminal ability information respectively, or ask for three's ability information common factor, send to the calling and called terminal simultaneously by the terminal capability response message.
For example: the ability information collection of a gateway: { voice conversation, video session, data session }, continue to segment G.711A, G.723.1, G729, G726, H263, H261, MPEG4, T120}.The capability set of a terminal: { voice conversation, video session }, continue segmentation { G.723.1, AMR, H263, MPEG4}.
Suppose that above-mentioned calling terminal is T1, terminal called is T2, realizes video interconnection by gateway.
Gateway competence set: A={G.711A, G.723.1, G729, G726, H263, H261, MPEG4, T120};
The competence set of calling terminal T1: B={G.723.1, AMR, H263, MPEG4};
The competence set of terminal called T2: C={G.723.1, G729, H263};
Get common factor A ∩ B={G.723.1, H263, MPEG4}, gateway and calling terminal T1 support the ability among the A ∩ B;
Get common factor A ∩ C={G.723.1, G729, H263}, gateway and terminal called T2 support the ability among the A ∩ C.
Getting the ability in order to select the other side to support exactly of occuring simultaneously.Only get common factor, selective power the time, whether selected ability is that the other side supports after could determining.If selected the unsupported characteristic of the other side, session will be failed.
When the video transfer gateway after calling and called send the terminal capability response message, ask two lateral terminals to open the passage of gateway sending direction simultaneously;
Two lateral terminals send the response message of opening gateway receive direction path message and opening gateway sending direction passage to the video transfer gateway;
The video transfer gateway enters the normal talking state after replying the message of opening gateway receive direction passage of two lateral terminals transmission simultaneously.
The present invention at first sets up and receives the data side passage, be the video transfer gateway at first to callee side H.324 terminal send and to open video transfer gateway and the request message of passage between the terminal H.324, receive receive the response and successfully set up described passage after, open H.323 terminal again to the passage of video transfer gateway.Can guarantee at the video transfer gateway like this and before H.324 the passage between the terminal is successfully set up, Calling Side H.323 terminal does not send data to the video transfer gateway, can avoid causing the image quality decrease of back because anterior video data loss, perhaps the image phenomenon that can not show.
H.323 terminal is as the callee, its specific implementation flow process as shown in Figure 3:
Call out callee side H.323 during terminal when terminal H.324 as Calling Side, H.324 terminal at first sends to a request of video transfer gateway link setup message; After the video transfer gateway is received this request link setup message, send request link setup message (ITU-T is message Q.931Setup), do not carry the fastStart parameter in this request link setup message, show that promptly the video transfer gateway do not support to open soon mode to terminal H.323; Perhaps the video transfer gateway is changed to its h245Tunneling parameter of carrying in the request link setup message that terminal H.323 sends and does not enable, and expression video transfer gateway is not supported the h245 tunnelling function, does not promptly support this kind to open mode soon.H.323 after terminal is received the request link setup message of video transfer gateway transmission, respond ALERTING message, call treatment message and call out connection message.Afterwards, the video transfer gateway respectively with the H.324 terminal negotiations process that begins H.245 to stipulate of called H.323 terminal, caller.Its concrete processing method repeats no more as mentioned above.
In sum, the inventive method comprises step shown in Figure 4:
H.323 S1, video transfer gateway are forced, and terminal enters the mode that opens slowly;
Initiatively to carry out ability information mutual with the calling and called terminal for S2, video transfer gateway, and ability information occured simultaneously be handed down to the calling and called terminal;
S3, video transfer gateway open earlier and the callee side terminal between passage after, open the passage with the Calling Side terminal again, realize the video interconnection of calling and called terminal.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1, a kind of H.323 terminal and the method for terminal video interconnection H.324, described H.323 terminal is characterized in that may further comprise the steps by the intercommunication of video transfer gateway with terminal H.324:
H.323 A, video transfer gateway are controlled, and terminal enters the mode that opens slowly;
B, video transfer gateway initiatively send the gateway ability information to caller and terminal called, and obtain the terminal ability information that caller and terminal called return;
Give both sides' terminal under C, video transfer gateway the ability information that gateway and terminal is common, and open earlier and terminal called between passage after open again and calling terminal between passage, carry out video interconnection.
2, the method for claim 1 is characterized in that, in the described steps A, H.323 terminal is caller and please seeks quickness when opening mode, and the video transfer gateway indicates it not support to open function soon in receiveing the response, and forcing H.323, terminal enters the mode that opens slowly.
3, method as claimed in claim 2, it is characterized in that, if H.323 terminal is carried in request link setup message and is opened parameter request soon and open mode soon, then the video transfer gateway send to terminal H.323 receive the response in do not carry and open parameter soon, indicate it not support to open soon function;
If H.323 terminal in request link setup message H.225 the h245 parameters for tunnel in the message be changed to enable to seek quickness and open mode, then the video transfer gateway is changed to its h245 parameters for tunnel in the H.225 message of H.323 terminal transmission and does not enable, and indicates it not support to open soon function.
4, the method for claim 1 is characterized in that, in the described steps A, when H.323 terminal is called, the video transfer gateway in sending to the request link setup message of terminal H.323 indication its do not support to open function soon, forcing H.323, terminal enters the mode that opens slowly.
5, method as claimed in claim 4 is characterized in that, the video transfer gateway does not carry in sending to the request link setup message of terminal H.323 and opens parameter soon; And/or the video transfer gateway is changed to its h245 parameters for tunnel in the H.225 message that terminal H.323 sends and do not enable, and indicates it not support to open soon function.
6, the method for claim 1 is characterized in that, is meant for both sides' terminal under the transfer gateway of video described in the step C the ability information that gateway and terminal is common: video transfer gateway and the total ability information of calling terminal are handed down to calling terminal; And the ability information that video transfer gateway and terminal called is total is handed down to terminal called.
7, the method for claim 1, it is characterized in that, be meant for both sides' terminal under the transfer gateway of video described in the step C the ability information that gateway and terminal is common: the ability information that video transfer gateway, calling terminal and terminal called is total, be handed down to caller and terminal called respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100026816A CN100433823C (en) | 2005-01-26 | 2005-01-26 | A H.323 terminal and method for video frequency communicating with H.324 terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100026816A CN100433823C (en) | 2005-01-26 | 2005-01-26 | A H.323 terminal and method for video frequency communicating with H.324 terminal |
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| CN1812559A true CN1812559A (en) | 2006-08-02 |
| CN100433823C CN100433823C (en) | 2008-11-12 |
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| CNB2005100026816A Expired - Fee Related CN100433823C (en) | 2005-01-26 | 2005-01-26 | A H.323 terminal and method for video frequency communicating with H.324 terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009024043A1 (en) * | 2007-08-20 | 2009-02-26 | Huawei Technologies Co., Ltd. | Video inter-working gateway equipment, system and method for realizing video call service |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002158715A (en) * | 2000-11-21 | 2002-05-31 | Matsushita Graphic Communication Systems Inc | Video telephone communication system and gateway device |
| FI20021067A0 (en) * | 2002-06-04 | 2002-06-04 | Ericsson Telefon Ab L M | Procedure for collaboration between multiple video communication terminals and video communication systems and video interoperability device |
| CN1270533C (en) * | 2002-12-23 | 2006-08-16 | 中兴通讯股份有限公司 | Data processing method and apparatus in conference TV-set multipoint controlling apparatus |
| CN1553710A (en) * | 2003-06-05 | 2004-12-08 | 浙江南望图像信息产业有限公司 | Flow converting system and method for video frequency meet |
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2005
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009024043A1 (en) * | 2007-08-20 | 2009-02-26 | Huawei Technologies Co., Ltd. | Video inter-working gateway equipment, system and method for realizing video call service |
| CN101374330B (en) * | 2007-08-20 | 2011-06-01 | 华为技术有限公司 | Video intercommunication gateway equipment, system and method for implementing video call business |
| US8560717B2 (en) | 2007-08-20 | 2013-10-15 | Huawei Technologies Co., Ltd. | Method and system for implementing video call service and video interworking gateway device |
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| CN100433823C (en) | 2008-11-12 |
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