CN104158814A - Method and device of converting media coding manner - Google Patents
Method and device of converting media coding manner Download PDFInfo
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- CN104158814A CN104158814A CN201410415994.3A CN201410415994A CN104158814A CN 104158814 A CN104158814 A CN 104158814A CN 201410415994 A CN201410415994 A CN 201410415994A CN 104158814 A CN104158814 A CN 104158814A
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Abstract
The invention relates to the field of communication and discloses a method and a device of converting a media coding manner for improving a success rate of session setup. The method comprises the following steps of when an SBC (Session Border Controller) receives an SDP (Session Description Protocol) negotiation request for the first time, compensating first media type information of a calling party, comparing the first media type information before compensation and second media type information selected by a called user based on the first media type information after compensation, when determining that the two have no intersection, selecting a first media coding manner used by the calling party based on the first media type information before compensation, selecting a second media coding manner used by the called party based on the second media type information, and converting the media coding manner of a media data stream between the calling party and the called party based on the first media coding manner and the second media coding manner. According to the method and the device, the problem of incapability of establishing the session due to failure of media format negotiation is avoided, and the success rate of session setup is improved, so that the system service performance is improved.
Description
Technical field
The present invention relates to data communication technology field, the method and apparatus that particularly a kind of media coding mode is changed.
Background technology
Analog signal figure (Voice over Internet Protocol, VoIP) technology has realized and on network, has transmitted easily language, video and data service.Be placed in Session Border Controller (the Session Border Controller of network core switching equipment side, SBC) for solve safety, Heterogeneous network interconnecting, network address translation (the Network Address Translation existing when disposing VoIP business, NAT) pass through and the problem such as service quality (QOS), be that SBC passes through, at network boundary place, the session of dialogue-based initiation protocol (Session Initiation Protocol, SIP) agreement is carried out to certain control.
Current SBC can be deployed between different IP Multimedia System (IP Multimedia Subsystem, IMS) network, also can provide access service for user connects IMS network.
SBC, when serving for user, can regard the contact point that user arrives IMS network as.In prior art, SBC is comprised of SGW controller (Signaling Gate Controller, SGC) and Media proxy (Media Proxy, MP) two parts, as shown in Figure 1.SGC mainly forwards signaling and media is set up and discharged, and MP mainly forwards media.Basic call flow as shown in Figure 2, has been indicated respectively the flow process of signaling and media in figure.
SBC forwards user-dependent SIP signaling and media bag, when running into two parties media coding mode when inconsistent, called subscriber equipment (User Equipment, UE) directly returning to sip message was 488 (representing unacceptable), be that media formats is consulted unsuccessfully, session cannot be set up, and can consult Fig. 3.
Step 301: called SBC receives invitation (INVITE) calling that calling UE initiates to carry Session Description Protocol (Session Description Protocol, SDP) 1.
In this process, called SBC carries out IP address destination address to the conversion of source address and rewrites new destination address, and distributes new port for called UE.
Step 302: after address transition, called SBC sends the INVITE calling of carrying SDP2 to called UE.
Step 303: called SBC receives 488 message that called UE is returned, the failure of presentation medium format negotiation.
In this process, called SBC carries out the conversion of source address and destination address again, and discharges the port having distributed.
Step 304: called SBC is by 488 message feedback to calling UE, and notice calling UE session establishment is failed.
By above-mentioned flow process, can find out, current SBC does not have the ability of assisting media conversion, like this, has increased the probability of session establishment failure in Multimedia session process, cause the function of whole system to be stagnated, desirable service cannot be provided for the multimedia terminal of becoming increasingly abundant.
Summary of the invention
Method and device that the embodiment of the present invention provides a kind of media coding mode to change, in order to improve session establishment success rate, thus elevator system service performance.
The concrete technical scheme that the embodiment of the present invention provides is as follows:
The method that media coding mode is changed, comprising:
SBC receives the media negotiation request that carries the first media type information that calling subscriber sends for the first time, and this first media type information is used to indicate the media coding mode that calling subscriber supports;
SBC carries out medium type compensation to first media type information of carrying in media negotiation request, and the first media type information after compensation is issued to called subscriber;
SBC receives the second media type information that called subscriber returns, and this second media type information is the media coding mode of self supporting that first media type information of called subscriber based on after compensating chosen; SBC carries out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber.
Like this, when running into two parties media coding mode when inconsistent, SBC can assist media conversion, avoids consulting because of media formats the problem that unsuccessfully session cannot be set up, and improves session establishment success rate, thus elevator system service performance.
Preferably, SBC carries out the compensation of media coding mode to first media type information of carrying in media negotiation request, comprising:
The media coding mode that can support and identify according to SBC is carried out the compensation of media coding mode to first media type information of carrying in media negotiation request, wherein, the medium type corresponding to media coding mode of compensation will be consistent with the medium type of original media coding mode, and media coding mode and original media coding mode of compensation can be changed mutually.
Preferably, SBC compares the first media type information and the second media type information before compensation, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before described compensation uses, and the second media coding mode of using based on the selected called subscriber of described the second media information, comprising:
If in the second media type information that SBC returns reception called subscriber, receive 200OK or ACK that called subscriber returns, the first media type information before SBC judgement compensation and the second media type information do not exist while occuring simultaneously, in the first media type information before the compensation of carrying calling subscriber, select the first media coding mode, in second media type information of carrying called subscriber, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved;
If in the second media type information that SBC returns reception called subscriber, do not receive 200OK or ACK that called subscriber returns, SBC sends to calling subscriber by the first media type information before compensation, and buffer memory the second media type information, and when receiving the 3rd media type information that calling subscriber returns, from the 3rd media type information, select the first media coding mode, and from the second media type information, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved, wherein, the 3rd media type information is the subset of the first media type information before compensation.
Preferably, SBC carries out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber, comprising:
SBC configures corresponding session port for calling subscriber and called subscriber, call the media coding mode unpaired message of supporting respectively calling subscriber and called subscriber of choosing, the media coding mode of the media data packet that calling subscriber is sent is converted to after the second media coding mode by the first media coding mode, send to called subscriber, and send to calling subscriber after the media data packet of called subscriber's transmission is converted to the first media coding mode by the second media coding mode.
Preferably, described SBC is the SBC of calling subscriber's side, or, be the SBC of called subscriber's side.
The device that media coding mode is changed, comprising:
The first receiving element, the media negotiation request that carries the first media type information sending for receiving for the first time calling subscriber, this first media type information is used to indicate the media coding mode that calling subscriber supports;
Compensating unit, first media type information of carrying for the request to media negotiation is carried out medium type compensation, and the first media type information after compensation is issued to called subscriber;
The second receiving element, the second media type information of returning for receiving called subscriber, this second media type information is the media coding mode of self supporting that first media type information of called subscriber based on after compensating chosen;
Processing unit, for the first media type information and the second media type information before compensation are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before described compensation uses, and the second media coding mode of using based on the selected called subscriber of described the second media information;
Converting unit, for carrying out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber.
Like this, when running into two parties media coding mode when inconsistent, this device can be assisted media conversion, avoids consulting because of media formats the problem that unsuccessfully session cannot be set up, and improves session establishment success rate, thus elevator system service performance.
Preferably, when first media type information of carrying in described media negotiation request is carried out to the compensation of media coding mode, described compensating unit specifically for:
The media coding mode that can support and identify according to this device is carried out the compensation of media coding mode to first media type information of carrying in media negotiation request, wherein, the medium type corresponding to media coding mode of compensation will be consistent with the medium type of original media coding mode, and media coding mode and original media coding mode of compensation can be changed mutually.
Preferably, the first media type information and the second media type information before compensation are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and during the second media coding mode of using based on the selected called subscriber of described the second media information, described processing unit specifically for:
If in the second media type information of returning reception called subscriber, receive 200OK or ACK that called subscriber returns, the first media type information before judgement compensation and the second media type information do not exist while occuring simultaneously, in the first media type information before the compensation of carrying calling subscriber, select the first media coding mode, in second media type information of carrying called subscriber, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved;
If in the second media type information of returning reception called subscriber, do not receive 200OK or ACK that called subscriber returns, the first media type information before compensation is sent to calling subscriber, and buffer memory the second media type information, and when receiving the 3rd media type information that calling subscriber returns, from the 3rd media type information, select the first media coding mode, and from the second media type information, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved, wherein, the 3rd media type information is the subset of the first media type information before compensation.
Preferably, between calling subscriber and called subscriber, based on the first media coding mode and the second media coding mode, media data flow is carried out to the conversion of media coding mode, described converting unit specifically for:
For calling subscriber and called subscriber configure corresponding session port, call the media coding mode unpaired message of supporting respectively calling subscriber and called subscriber of choosing, the media coding mode of the media data packet that calling subscriber is sent is changed after the second media coding mode by the first media coding mode, send to called subscriber, and after the media data packet that called subscriber sends is converted to the first media coding mode by the second media coding mode and send to calling subscriber.
Preferably, described device is the session border control network element SBC of calling subscriber's side, or, be the SBC of called subscriber's side.
The device that media coding mode is changed, comprising:
SGC, the media negotiation request that carries the first media type information sending for receiving for the first time calling subscriber, this first media type information is used to indicate the media coding mode that calling subscriber supports, first media type information of carrying in media negotiation request is carried out to medium type compensation, and the first media type information after compensation is issued to called subscriber, and receive the second media type information that called subscriber returns, this second media type information is the media coding mode of self supporting that first media type information of called subscriber after based on described compensation chosen, and the first media type information and the second media type information before compensation are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and the second media coding mode of using based on the selected called subscriber of the second media information,
MP, for carrying out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber.
Like this, when running into two parties media coding mode when inconsistent, this device can be assisted media conversion, avoids consulting because of media formats the problem that unsuccessfully session cannot be set up, and improves session establishment success rate, thus elevator system service performance.
Preferably, when first media type information of carrying in media negotiation request is carried out to the compensation of media coding mode, described SGC specifically for:
The media coding mode that can support and identify according to SBC is carried out the compensation of media coding mode to first media type information of carrying in media negotiation request, wherein, the medium type corresponding to media coding mode of compensation will be consistent with the medium type of original media coding mode, and media coding mode and original media coding mode of compensation can be changed mutually.
Preferably, the first media type information and the second media type information before compensation are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and during the second media coding mode of using based on the selected called subscriber of the second media information, described processing unit specifically for:
If in the second media type information of returning reception called subscriber, receive 200OK or ACK that called subscriber returns, the first media type information before judgement compensation and the second media type information do not exist while occuring simultaneously, in the first media type information before the compensation of carrying calling subscriber, select the first media coding mode, in second media type information of carrying called subscriber, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved;
If in the second media type information of returning reception called subscriber, do not receive 200OK or ACK that called subscriber returns, the first media type information before compensation is sent to calling subscriber, and buffer memory the second media type information, and when receiving the 3rd media type information that calling subscriber returns, from the 3rd media type information, select the first media coding mode, and from the second media type information, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved, wherein, the 3rd media type information is the subset of the first media type information before compensation.
Preferably, between calling subscriber and called subscriber, based on the first media coding mode and the second media coding mode, media data flow is carried out to the conversion of media coding mode, described MP specifically for:
For calling subscriber and called subscriber configure corresponding session port, call the media coding mode unpaired message of supporting respectively calling subscriber and called subscriber of choosing, the media coding mode of the media data packet that calling subscriber is sent is converted to after the second media coding mode by the first media coding mode, send to called subscriber, and send to calling subscriber after the media data packet of called subscriber's transmission is converted to the first media coding mode by the second media coding mode.
Preferably, described SBC is the SBC of calling subscriber's side, or, be the SBC of called subscriber's side.
Accompanying drawing explanation
Fig. 1 is the SBC part structure chart under prior art;
Fig. 2 is call business schematic diagram under prior art;
Fig. 3 is that under prior art, SBC processes call business flow chart;
Fig. 4 is that in the embodiment of the present invention, SBC carries out media coding mode flow path switch figure;
Fig. 5 be in the embodiment of the present invention SBC based on once having consulted media coding mode flow path switch figure;
Fig. 6 is that in the embodiment of the present invention, SBC changes schematic diagram based on once having consulted media coding mode;
Fig. 7 be in the embodiment of the present invention SBC based on repeatedly having consulted media coding mode flow path switch figure;
Fig. 8 is that in the embodiment of the present invention, SBC changes schematic diagram based on repeatedly having consulted media coding mode;
Fig. 9 is the operation chart of the MP module in SBC in the embodiment of the present invention;
Figure 10 and Figure 11 are the operation chart of Calling Side SBC in the embodiment of the present invention;
Figure 12 and Figure 13 are the operation chart of callee side SBC in the embodiment of the present invention;
Figure 14 and Figure 15 are SBC structural representation in the embodiment of the present invention.
Embodiment
The embodiment of the present invention has designed a kind of SBC that can participate in media negotiation, by Session Description Protocol (Session Description Protocol, the mode of SDP) consulting, in the situation that the different conversions that realize form of the media coding type of calling subscriber equipment and called subscriber equipment, thereby between calling subscriber equipment and called subscriber equipment, successfully set up session connection, effectively avoid the problem of the session establishment failure that situation causes thus, thereby reached the object that promotes the ability that interconnects between user.
Below in conjunction with Figure of description, the preferred embodiment of the present invention is elaborated.
Consult shown in Fig. 4, in the embodiment of the present invention, carrying out media coding mode while changing, SBC carries out following operation:
Step 401:SBC receives the media negotiation request that carries the first media type information that calling subscriber sends for the first time, and this first media type information is used to indicate the media coding mode that calling subscriber supports.
Step 402:SBC carries out medium type compensation to first media type information of carrying in media negotiation request, and the first media type information after compensation is issued to called subscriber.
Step 403:SBC receives the second media type information that called subscriber returns, and this second media type information is the media coding mode of self supporting that first media type information of called subscriber based on after compensating chosen.
Concrete, the second media type information is the subset of the first media information after compensation.
Step 404:SBC compares the first media type information and the second media type information before compensation, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and the second media coding mode of using based on the selected called subscriber of the second media information.
Concrete, why SBC compares the first media type information and the second media type information before compensation, be because, if there is common factor in both, illustrate that the part/whole elements that comprise in the second media type information are to choose from the first media type information compensation, be that calling subscriber and called subscriber support the media coding mode that the element in common factor characterizes simultaneously, now can not carry out the conversion of media coding mode; And if there is not common factor in both, illustrate that the whole elements that comprise in the second media type information are to choose from the second media type information of compensated part, be that calling subscriber and called subscriber support respectively different media coding modes, now, must carry out the conversion of media coding mode.
Step 405:SBC carries out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber.
Adopt several concrete application scenarioss that above-described embodiment is made and being further illustrated below.
Under the first scene, consult shown in Fig. 5, between calling subscriber (hereinafter referred to as UE-A), SBC and called subscriber (hereinafter referred to as UE-B), only carry out SDP negotiation one time, its idiographic flow is as follows:
Step 501:SBC receives the SDP negotiation request that UE-A initiates, and in this SDP negotiation request, carries media formats set A 1, and the element in A1 is used to indicate the media coding mode that UE-A supports, SBC records A1.
Step 502:SBC carries out IP address destination address to the conversion of source address and rewrites new destination address, and distributes new port for UE-B.
For example, as shown in table 1, SBC applies for and safeguards that data transmit, IP address and port PO RT comprising UE-A, being designated as (IP1, PORT1), SBC is reception IP address and the port PO RT that UE-A distributes, and is designated as IP address and port PO RT that (IPint1, PORTint1), SBC are used while sending data, is designated as (IPext2, PORText2), and the IP address of UE-B and port PO RT, be designated as (IP2, PORT2).Wherein, SBC carries UE-A in SDP IP1 and POTR1 are revised as IPext2 and PORText2.
Table 1
| IP1、PORT1 |
| IPint1、PORTint1 |
| IPext2、PORText2 |
| IP2、PORT2 |
Step 503:SBC compensates the media coding mode in A1, and after the medium type set of compensation (hereinafter referred to as Δ A) is placed on A1, new media formats set is (A1+ Δ A).
Concrete, carrying out media coding mode while compensating, need to follow following principle:
First, must be the media coding mode that SBC can support and identify, that is, must be the media coding mode that MP in SBC can identifying processing.
Secondly, the medium type corresponding to media coding mode of compensation will be consistent with the medium type of original media coding mode.For example, corresponding to original video code model, only can compensate new video code model, in like manner, corresponding to original audio coding form, only can compensate new audio coding form.
Finally, the media coding mode of compensation and original media coding mode can be changed mutually.
In actual implementation procedure, SBC need to describe the information such as medium type that UE-A supports by the m capable (media are capable) in SDP negotiation request.In the medium type that MP supports, find out consistent with former medium type and with the media coding mode that original media coding mode can be changed mutually, compensate capable at corresponding m.For example: the capable information of m is originally <m=audio 10000RTP/AVP 04 8>, representative supports that the media coding mode of audio types and support is { 0,4,8}.When this journey is compensated, in the medium type that should support at MP, find out support audio types and { the media coding mode that 048} can change is mutually (as { 3 with media coding mode, 5,9,18}) compensation is after m is capable, and the capable information of m after compensation is <m=audio 10000RTP/AVP 048359 18>, wherein, the priority level of balanced media coding mode should be lower than original media coding mode.
A capable (property columns of media) in SDP negotiation request has described title and the property value of attribute.For the capable compensating movement of a in SDP, need to deferring to following provisions: SBC, after original a is capable, to increase corresponding a capable, for the capable sequence of balanced a, can defer to the degree of freedom of SBC configuration and select, also can select at random; The capable media coding mode of a of compensation must can be changed mutually with former media coding mode, the form that for example can carry out the conversion of media coding mode with a form has { a1, a2, a3}, the form that can carry out the conversion of media coding mode with b form has { b1, b2, b3} etc., concrete as 711 and 729, AMR can change mutually, H263 and H264 can change etc. mutually.
Step 504:SBC sends to UE-B by the SDP negotiation request of carrying media formats set (A1+ Δ A) after compensation, and request UE-B carries out SDP negotiation.
Step 505:SBC receives the SDP response that UE-B returns, and the media formats set of carrying in this SDP response is B1, and wherein B1 is the subset of (A1+ Δ A), and the element in B1 is used to indicate the media coding mode that UE-B supports, SBC records B1.
Step 506:SBC judges when the SDP respond packet receiving contains 200OK or ACK, determines that SDP negotiation completes.
In practical application, UE-B can adopt sip message to carry out SDP response, and sip message carries a plurality of fields, if while carrying 200OK field or ACK field in SBC judgement sip message, can determine that SDP negotiation completes, need to be the selected corresponding media coding mode of UE-A and UE-B as early as possible.
Step 507:SBC determines that B1 ∩ A1 is at 0 o'clock, respectively for UE-A and the selected media coding mode of UE-B.
Concrete, SBC compares A1 and two kinds of media formats set of B1, judges whether B1 ∩ A1 is zero.If not zero, exist and occur simultaneously, the part or all of element in B1 is selected from A1, and SBC records common factor and common factor is transmitted to UE-A; If zero, there is not common factor, the element in B1 is selected from Δ A, SBC need to choose a media coding mode a in A1 set, and in B1, choose a media coding mode b, by { a, the media coding mode unpaired message of b} sends to local MP, carries out transcoding operation in the follow-up flow process of notice MP according to this unpaired message.
Step 508:SBC carries out the conversion of source address and destination address again, and discharges the port having distributed.
Step 509:SBC sends the SDP response that carries B2 to UE-A, it is the final selected media coding mode a of UE-A that the element in B2 is used to indicate SBC, described in step 507.
Concrete, SBC notifies UE-A by B2 by selected element a.
So far, media negotiating process completes, UE-A and UE-B can start to carry out session, now, SBC can configure corresponding session port for UE-A and UE-B in follow-up flow process, and calls the media coding mode unpaired message { a choosing, b}, for data flow mutual between UE-A and UE-B, carry out transcoding operation, after the media coding mode of the data flow that UE-A is sent is revised as b by a, mail to UE-B, and mail to UE-A after the media coding mode of the data flow of UE-B transmission is revised as to a by b.
The simple and easy schematic diagram of said method as shown in Figure 6.
Step 601:SBC receives the SDP negotiation request that carries media formats set A 1 of UE-A initiation and records A1.
Step 602:SBC compensates the media coding mode in A1, and the set after compensation is designated as to SDP (A1+ Δ A), and this set is issued to UE-B.
Step 603:SBC receives the media formats set B 1 that UE-B returns, and records B1.
Step 604:SBC compares A1 set and B1 set, determines that both do not exist while occuring simultaneously, and chooses respectively an element in two set, is convenient to carry out in follow-up flow process medium type conversion operations.
Under the second scene, consult shown in Fig. 7, carry out repeatedly SDP negotiation between UE-A, SBC and UE-B, its idiographic flow is as follows:
Step 701:SBC receives the SDP negotiation request that UE-A initiates, and in this SDP negotiation request, carries media formats set A 1, and the element in A1 is used to indicate the media coding mode that UE-A supports, SBC records A1.
Step 702:SBC carries out IP address destination address to the conversion of source address and rewrites new destination address, and distributes new port for UE-B.
Step 703:SBC receives the SDP negotiation request that UE-A initiates for the first time, need to the media coding mode in A1 be compensated, after the media coding mode set (hereinafter referred to as Δ A) of compensation is placed on A1, the new media formats set after compensation is (A1+ Δ A).
Wherein, carrying out media coding mode while compensating, the principle that need to follow is identical with step 502.
Step 704:SBC sends to UE-B by the SDP negotiation request of carrying media formats set (A1+ Δ A) after compensation, and request UE-B carries out SDP negotiation.
Step 705:SBC receives the SDP response that UE-B returns, and the media formats set of carrying in this SDP response is B1, and wherein B1 is the subset of (A1+ Δ A), and the element in B1 is used to indicate the media coding mode that UE-B supports, SBC records B1.
The sip message that SDP response is carried in step 706:SBC judgement comprises 183, represents that SDP negotiation does not complete, and follow-uply also can carry out SDP negotiation.
Step 707:SBC determines that B1 ∩ A1 is at 0 o'clock, and the element in A1 is transmitted to UE-A, and buffer memory B1.
Concrete, SBC compares A1 and two kinds of media formats set of B1, judges whether B1 ∩ A1 is zero.If not zero, exist and occur simultaneously, the part or all of element in B1 is selected from A1, and SBC records common factor be transmitted to UE-A; If zero, there is not common factor, the element in B1 is selected from Δ A, and SBC is saved in the media coding mode in set A 1 in set B 2, and buffer memory B1.
SBC will { the media coding mode unpaired message of 0,0} sends to local MP, in the follow-up flow process of notice MP, does not start transcoding program.
Step 708:SBC carries out the conversion of source address and destination address again, and discharges the port having distributed.
Step 709:SBC sends the SDP response that carries B2 to UE-A, it is the selected media coding mode of UE-A that the element in B2 is used to indicate SBC.
Concrete, SBC sends to UE-A by the element in A1.
Step 710:SBC receives the PRACK message that UE-A initiates, and carries media formats set C1 in this message,
, the element in this set is used to indicate the media coding mode that UE-A supports.
Step 711:SBC again carries out IP address destination address to the conversion of source address and rewrites new destination address, and distributes new port for UE-B.
Step 712:SBC selects an element d from the B1 of buffer memory, and this element is that SBC is the selected media coding mode of UE-B, and from C1, to select an element c, this element c be that SBC is the selected media coding mode of UE-A.
By media coding mode unpaired message, { c, the media coding mode unpaired message of d} sends to local MP to SBC, notifies MP according to this unpaired message, media data packet to be carried out to the conversion of media coding mode in follow-up flow process.
Step 713:SBC sends the SDP response of carrying C2 to UE-B, include media coding mode d in C2.
Step 714:SBC receives the SDP response that UE-B returns, and judges in this response and includes 200OK, determines that SDP negotiation completes, and in the D1 simultaneously carrying in this SDP response, includes media coding mode d.
After step 715:SBC determines that SDP negotiation completes, element c in C1 is stored in set D2, element c is that SBC is the selected media coding mode of UE-A.
Step 716:SBC carries out the conversion of source address and destination address again.
Step 717:SBC sends the SDP response that carries D2 to UE-A, it is the final selected media coding mode c of UE-A that the element in D2 is used to indicate SBC.
Concrete, in D2, only including only element c, SBC notifies UE-A by D2 by selected element c.
So far, media negotiating process completes, UE-A and UE-B can start to carry out session, now, SBC can configure corresponding session port for UE-A and UE-B in follow-up flow process, and call the media coding mode unpaired message { c choosing, d}, for media data packet mutual between UE-A and UE-B, carry out transcoding operation, after the media coding mode of the media data packet that UE-A is sent is revised as d by c, mail to UE-B, and mail to UE-A after the media coding mode of the media data packet of UE-B transmission is revised as to c by d.
The simple and easy schematic diagram of said method as shown in Figure 8.
Step 801:SBC receives the SDP negotiation request that carries media formats set A 1 of UE-A initiation and records A1.
Step 802:SBC compensates the media coding mode in A1, and the set after compensation is designated as to SDP (A1+ Δ A), and this set is issued to UE-B.
Step 803:SBC receives the media formats set B 1 that UE-B returns, and records B1.Judge and carry the corresponding sip message of SDP, determine that SDP negotiation does not complete, need to repeatedly consult.
Step 804:SBC compares A1 and B1, determines that both do not exist while occuring simultaneously, and be stored in the media coding mode in A1 in B2, and B2 is sent to UE-A.
Step 805:SBC receives the PRACK message that UE-A initiates, and carries media formats set C1 in this message,
, the element in this set is used to indicate the media coding mode that UE-A supports.
Step 806:SBC selects an element d from the B1 set of buffer memory, and this element is that SBC is the selected media coding mode of UE-B, and element d is stored in D1.From C1, select a kind of media coding mode c, formation media coding mode unpaired message c, d}, and this media coding form unpaired message is sent to MP, meanwhile, by comprising, { the SDP response of d} sends to UE-B to SBC.
Step 807:SBC receives the SDP response that UE-B returns, and in the D1 that this SDP response is carried, includes media coding mode d.
Step 808:SBC sends the SDP response that carries D2 to UE-A, comprise unique element c in D2, and it is the final selected media coding mode of UE-A that this element is used to indicate SBC.
For the MP module in SBC, after media negotiating process completes, MP, to the Media Stream of receiving, first carry out the conversion of media formats through media format conversion unit, then by media forwarding unit, carry out the forwarding of media data packet.Detailed process can be with reference to accompanying drawing 9.
SBC in the embodiment of the present invention, between user and IMS network, can be divided into Calling Side SBC and callee side SBC according to the difference of position, and wherein, at Calling Side and callee side, it is consistent that SBC processes action.
Calling Side SBC can strengthen media capability for calling UE, as shown in figure 10.In the situation that Calling Side SBC cannot predict the media coding mode that calling terminal is supported, if the media coding mode that calling UE is supported is fewer, Calling Side SBC can help terminal to connect the terminal of other media coding modes.
Step 1001: Calling Side SBC receives that calling UE sends carries 1 SDP response.
Step 1002: Calling Side SBC revises the content in 1, and sends to IMS network.
Step 1003: Calling Side SBC receives 2 the SDP response of carrying that called UE that IMS network sends brings calling UE.
Step 1004: Calling Side SBC revises the content in 2, and returns to UE-A.
Concrete operating process as shown in figure 11.
Callee side SBC also can be for called UE strengthens media capability, as shown in figure 12.From IMS network side, call out the situation of terminal called UE, if the media coding mode that called UE is supported is fewer, callee side SBC can help its media coding mode of terminal modifications, promotes the media processing capacity of called UE.
Step 1201: callee side SBC receives the SDP response that IMS network sends.
Step 1202: callee side SBC revises the content in SDP, and sends to called UE.
Step 1203: callee side SBC receives the SDP response of carrying own content 2* that called UE sends.
Step 1204: callee side SBC revises the content in 2*, and sends to IMS network.
Concrete operating process as shown in figure 13.
Based on above-described embodiment, to consult shown in Figure 14, in the embodiment of the present invention, SBC comprises the first receiving element 1401, compensating unit 1402, the second receiving element 1403, processing unit 1404 and converting unit 1405.
The first receiving element 1401, the media negotiation request that carries the first media type information sending for receiving for the first time calling subscriber, this first media type information is used to indicate the media coding mode that calling subscriber supports;
Compensating unit 1402, first media type information of carrying for the request to media negotiation is carried out medium type compensation, and the first media type information after compensation is issued to called subscriber;
The second receiving element 1403, the second media type information of returning for receiving called subscriber, the media coding mode of self supporting that first media type information of this second media type information called subscriber based on after compensating chosen;
Processing unit 1404, for the first media type information and the second media type information are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and the second media coding mode of using based on the selected called subscriber of the second media information;
Converting unit 1405, for carrying out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber.
When first media type information of carrying in media negotiation request is carried out to the compensation of media coding mode, compensating unit 1402 specifically for:
The media coding mode that can support and identify according to this device is carried out the compensation of media coding mode to first media type information of carrying in media negotiation request, wherein, the medium type corresponding to media coding mode of compensation will be consistent with the medium type of original media coding mode, and media coding mode and original media coding mode of compensation can be changed mutually.
The first media type information and the second media type information are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and during the second media coding mode of using based on the selected called subscriber of the second media information, processing unit 1404 specifically for:
If in the second media type information of returning reception called subscriber, receive 200OK or ACK that called subscriber returns, the first media type information before judgement compensation and the second media type information do not exist while occuring simultaneously, in the first media type information before the compensation of carrying calling subscriber, select the first media coding mode, in second media type information of carrying called subscriber, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved;
If in the second media type information of returning reception called subscriber, do not receive 200OK or ACK that called subscriber returns, the first media type information before compensation is sent to calling subscriber, and buffer memory the second media type information, and when receiving the 3rd media type information that calling subscriber returns, from the 3rd media type information, select the first media coding mode, and from the second media type information, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved, wherein, the 3rd media type information is the subset of the first media type information before compensation.
Preferably, between calling subscriber and called subscriber, based on the first media coding mode and the second media coding mode, media data flow is carried out to the conversion of media coding mode, converting unit 1405 specifically for:
For calling subscriber and called subscriber configure corresponding session port, call the media coding mode unpaired message of supporting respectively calling subscriber and called subscriber of choosing, the media coding mode of the media data packet that calling subscriber is sent is changed after the second media coding mode by the first media coding mode, send to called subscriber, and after the media data packet that called subscriber sends is converted to the first media coding mode by the second media coding mode and send to calling subscriber.
Preferably, this device is the SBC of calling subscriber's side, or, be the SBC of called subscriber's side.
Based on above-described embodiment, to consult shown in Figure 15, in the embodiment of the present invention, SBC comprises SGC1501 and MP1502, wherein.
SGC1501, the media negotiation request that carries the first media type information sending for receiving for the first time calling subscriber, this first media type information is used to indicate the media coding mode that calling subscriber supports, first media type information of carrying in media negotiation request is carried out to medium type compensation, and the first media type information after compensation is issued to called subscriber, and receive the second media type information that called subscriber returns, this second media type information is the media coding mode of self supporting that first media type information of called subscriber after based on described compensation chosen, and the first media type information and the second media type information before compensation are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and the second media coding mode of using based on the selected called subscriber of the second media information,
MP1502, for carrying out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber.
Preferably, when first media type information of carrying in media negotiation request is carried out to the compensation of media coding mode, SGC1501 specifically for:
The media coding mode that can support and identify according to SBC is carried out the compensation of media coding mode to first media type information of carrying in media negotiation request, wherein, the medium type corresponding to media coding mode of compensation will be consistent with the medium type of original media coding mode, and media coding mode and original media coding mode of compensation can be changed mutually.
Preferably, the first media type information and the second media type information before compensation are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and during the second media coding mode of using based on the selected called subscriber of the second media information, processing unit specifically for:
If in the second media type information of returning reception called subscriber, receive 200OK or ACK that called subscriber returns, the first media type information before judgement compensation and the second media type information do not exist while occuring simultaneously, in the first media type information before the compensation of carrying calling subscriber, select the first media coding mode, in second media type information of carrying called subscriber, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved;
If in the second media type information of returning reception called subscriber, do not receive 200OK or ACK that called subscriber returns, the first media type information before compensation is sent to calling subscriber, and buffer memory the second media type information, and when receiving the 3rd media type information that calling subscriber returns, from the 3rd media type information, select the first media coding mode, and from the second media type information, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved, wherein, the 3rd media type information is the subset of the first media type information before compensation.
Preferably, between calling subscriber and called subscriber, based on the first media coding mode and the second media coding mode, media data flow is carried out to the conversion of media coding mode, MP1502 specifically for:
For calling subscriber and called subscriber configure corresponding session port, call the media coding mode unpaired message of supporting respectively calling subscriber and called subscriber of choosing, the media coding mode of the media data packet that calling subscriber is sent is converted to after the second media coding mode by the first media coding mode, send to called subscriber, and send to calling subscriber after the media data packet of called subscriber's transmission is converted to the first media coding mode by the second media coding mode.
Preferably, SBC is the SBC of calling subscriber's side, or, be the SBC of called subscriber's side.
In sum, in the embodiment of the present invention, SBC receives the media negotiation request that carries the first media type information that calling subscriber sends, first media type information of carrying in media negotiation request is carried out to medium type compensation, and the first media type information after compensation is issued to called subscriber, and receive the second media type information that called subscriber returns, and the first media type information and the second media type information before compensation are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before compensation uses, and the second media coding mode of using based on the selected called subscriber of the second media information, between calling subscriber and called subscriber, based on the first media coding mode and the second media coding mode, media data flow is carried out to the conversion of media coding mode.Like this, when running into two parties media coding mode when inconsistent, SBC can assist media conversion, avoids consulting because of media formats the problem that unsuccessfully session cannot be set up, and improves session establishment success rate, thus elevator system service performance.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect completely.And the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code one or more.
The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction of carrying out by the processor of computer or other programmable data processing device is produced for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame on computer or other programmable devices.
Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the embodiment of the present invention the embodiment of the present invention.Like this, if within these of the embodiment of the present invention are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. the method that media coding mode is changed, is characterized in that, comprising:
Session border control network element SBC receives the media negotiation request that carries the first media type information that calling subscriber sends for the first time, and this first media type information is used to indicate the media coding mode that calling subscriber supports;
SBC carries out medium type compensation to first media type information of carrying in described media negotiation request, and the first media type information after compensation is issued to called subscriber;
SBC receives the second media type information that called subscriber returns, and this second media type information is the media coding mode of self supporting that first media type information of called subscriber after based on described compensation chosen;
SBC compares the first media type information and the second media type information before compensation, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before described compensation uses, and the second media coding mode of using based on the selected called subscriber of described the second media information;
SBC carries out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber.
2. the method for claim 1, is characterized in that, SBC carries out the compensation of media coding mode to first media type information of carrying in described media negotiation request, comprising:
The media coding mode that can support and identify according to SBC is carried out the compensation of media coding mode to first media type information of carrying in described media negotiation request, wherein, the medium type corresponding to media coding mode of compensation will be consistent with the medium type of original media coding mode, and media coding mode and original media coding mode of compensation can be changed mutually.
3. the method for claim 1, it is characterized in that, SBC compares the first media type information and the second media type information before compensation, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before described compensation uses, and the second media coding mode of using based on the selected called subscriber of described the second media information, comprising:
If in the second media type information that SBC returns reception called subscriber, receive 200OK or ACK that called subscriber returns, the first media type information before SBC judgement compensation and the second media type information do not exist while occuring simultaneously, in the first media type information before the compensation of carrying calling subscriber, select the first media coding mode, in second media type information of carrying called subscriber, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved;
If in the second media type information that SBC returns reception called subscriber, do not receive 200OK or ACK that called subscriber returns, SBC sends to calling subscriber by the first media type information before compensation, and buffer memory the second media type information, and when receiving the 3rd media type information that calling subscriber returns, from the 3rd media type information, select the first media coding mode, and from the second media type information, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved, wherein, the 3rd media type information is the subset of the first media type information before compensation.
4. the method as described in claim 1,2 or 3, is characterized in that, SBC carries out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber, comprising:
SBC configures corresponding session port for calling subscriber and called subscriber, call the media coding mode unpaired message of supporting respectively calling subscriber and called subscriber of choosing, the media coding mode of the media data packet that calling subscriber is sent is converted to after the second media coding mode by the first media coding mode, send to called subscriber, and send to calling subscriber after the media data packet of called subscriber's transmission is converted to the first media coding mode by the second media coding mode.
5. the method as described in claim 1,2 or 3 any one, is characterized in that, described SBC is the SBC of calling subscriber's side, or, be the SBC of called subscriber's side.
6. the device that media coding mode is changed, is characterized in that, comprising:
The first receiving element, the media negotiation request that carries the first media type information sending for receiving for the first time calling subscriber, this first media type information is used to indicate the media coding mode that calling subscriber supports;
Compensating unit, carries out medium type compensation for the first media type information that described media negotiation request is carried, and the first media type information after compensation is issued to called subscriber;
The second receiving element, the second media type information of returning for receiving called subscriber, this second media type information is the media coding mode of self supporting that first media type information of called subscriber after based on described compensation chosen;
Processing unit, for the first media type information and the second media type information before compensation are compared, determine that both do not exist while occuring simultaneously, the first media coding mode that the selected calling subscriber of the first media type information based on before described compensation uses, and the second media coding mode of using based on the selected called subscriber of described the second media information;
Converting unit, for carrying out the conversion of media coding mode based on the first media coding mode and the second media coding mode to media data flow between calling subscriber and called subscriber.
7. device as claimed in claim 6, is characterized in that, when first media type information of carrying in described media negotiation request is carried out to the compensation of media coding mode, described compensating unit specifically for:
The media coding mode that can support and identify according to this device is carried out the compensation of media coding mode to first media type information of carrying in described media negotiation request, wherein, the medium type corresponding to media coding mode of compensation will be consistent with the medium type of original media coding mode, and media coding mode and original media coding mode of compensation can be changed mutually.
8. device as claimed in claim 6, it is characterized in that, the first media type information and the second media type information are compared, determine that both do not exist while occuring simultaneously, the first media coding mode of using based on the selected calling subscriber of described the first media type information, and during the second media coding mode of using based on the selected called subscriber of described the second media information, described processing unit specifically for:
If in the second media type information of returning reception called subscriber, receive 200OK or ACK that called subscriber returns, the first media type information before judgement compensation and the second media type information do not exist while occuring simultaneously, in the first media type information before the compensation of carrying calling subscriber, select the first media coding mode, in second media type information of carrying called subscriber, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved;
If in the second media type information of returning reception called subscriber, do not receive 200OK or ACK that called subscriber returns, the first media type information before compensation is sent to calling subscriber, and buffer memory the second media type information, and when receiving the 3rd media type information that calling subscriber returns, from the 3rd media type information, select the first media coding mode, and from the second media type information, select the second media coding mode, and the unpaired message of the first media coding mode and the second media coding mode is preserved, wherein, the 3rd media type information is the subset of the first media type information before compensation.
9. the device as described in claim 6,7 or 8, is characterized in that, between calling subscriber and called subscriber, based on the first media coding mode and the second media coding mode, media data flow is carried out to the conversion of media coding mode, described converting unit specifically for:
For calling subscriber and called subscriber configure corresponding session port, call the media coding mode unpaired message of supporting respectively calling subscriber and called subscriber of choosing, the media coding mode of the media data packet that calling subscriber is sent is changed after the second media coding mode by the first media coding mode, send to called subscriber, and after the media data packet that called subscriber sends is converted to the first media coding mode by the second media coding mode and send to calling subscriber.
10. the device as described in claim 6,7 or 8 any one, is characterized in that, described device is the session border control network element SBC of calling subscriber's side, or, be the SBC of called subscriber's side.
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