CN102340490A - Method and system for realizing anchor of media - Google Patents
Method and system for realizing anchor of media Download PDFInfo
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- CN102340490A CN102340490A CN2010102360681A CN201010236068A CN102340490A CN 102340490 A CN102340490 A CN 102340490A CN 2010102360681 A CN2010102360681 A CN 2010102360681A CN 201010236068 A CN201010236068 A CN 201010236068A CN 102340490 A CN102340490 A CN 102340490A
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Abstract
The invention discloses a method and system for realizing the anchor of a media. The method comprises the following steps of: after an application-level gateway (ALG) receives a session description protocol (SDP) request, carrying media resource information in the SDP request, which is received by the ALG, in the SDP request required to be forwarded and media resource information of a media processing entity, which is distributed by the ALG; forwarding the media resource information to the SDP request; after an application server (AS) receives the SDP request, determining whether the ALG is required for anchoring the media and transmitting a media anchor indication for expressing whether the ALG is required for anchoring the media as well as a session initial protocol (SIP) message responded by the SDP; and after the ALG receives the SIP message, determining whether the media is anchored. Whether the ALG is required for anchoring the media is realized by the AS by calling an existing signaling in the establishment process without an extra signaling, thereby the signaling consumption is saved and further the call establishment duration is shortened.
Description
Technical field
The present invention relates to the call technology in the IP Multimedia System (IMS, IP Multimedia Core Network Subsystem), refer to a kind of method and system that realize the medium grappling especially.
Background technology
IMS is a kind of IP-based network framework that is proposed by third generation partner program (3GPP, 3rd Generation Partnership Project), has made up an opening and service environment flexibly.IMS supports multimedia application, can abundant multimedia service be provided for the user.
In the IMS business system, key-course separates with operation layer, and key-course does not provide concrete business, and functions such as necessary triggering, route, charging only are provided to operation layer.
Service trigger and controlled function are to be accomplished by CSCF (CSCF, Call SessionControl Function) in the key-course.CSCF is divided into: Proxy Call Session Control Function (P-CSCF; Proxy-CSCF), query call conversation control function (I-CSCF; Interrogating-CSCF) and service call conversation control function (S-CSCF; Serving-CSCF) three types, wherein I-CSCF is optional.
Operation layer is made up of a series of application servers (AS, Application Server), and concrete business service can be provided, and AS can be an independent entity, also may reside among the S-CSCF.
S-CSCF in the key-course calls the business on the AS according to user's CAMEL-Subscription-Information control service trigger, realizes business function.
Also there is ALG (ALG) in the IMS network; ALG comprises signaling processing entity and medium processing entity; Be used to realize the functions such as address transition of mutual, topology hiding, medium encoding and decoding conversion and the media data of control signaling and medium between heterogeneous networks; If the ALG decision is included in its medium processing entity in the media path, then media path is divided into two sections by ALG between two conversational terminals.
End-to-end equipment in the session is called subscriber equipment (UE, User Equipment), is responsible for mutual with the user; The UE that has has the mode of multiple access network; Comprise packet switch (PS, Packet Switch) territory access network, through the PS territory access network of other non-3GPP through 3GPP; Even can be through circuit switching (CS, Circuit Switch) territory access network etc.
In the prior art, if along Session Description Protocol (SDP) request direction of transfer, ALG is before AS; So; ALG can't ask initiator's user signing contract information whether to determine the grappling medium according to SDP, when singly treating continuity business such as the multimode of having contracted the calling subscriber (network and terminal can realize that the user keeps speech business not interrupt when the PS territory switches to the CS territory), at this moment; ALG is earlier according to local policy decision grappling medium or not grappling medium; And after the SDP request arrived AS, AS determined not needs grappling or needs grappling medium according to SDP request initiator's user signing contract information, so; AS reinforms ALG, carries out media resource by ALG through possible extra signalling interactive process and heavily consults to realize removing grappling or grappling medium.Obviously, prior art is exhaled in the grappling media method that realizes in the process rising, and has consumed extra signaling, has caused call set-up time long.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and system that realize the medium grappling, can save signaling consumption, shortens the call setup duration.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that realizes the medium grappling, this method comprises:
After ALG ALG receives Session Description Protocol SDP request; In the SDP request that needs are transmitted, carry the media resource information in the SDP request that said ALG receives; And the media resource information of the medium processing entity of said ALG distribution, and transmit this SDP request;
Application server AS is received the SDP request, need to determine whether said ALG grappling medium, and transmission carries the session initiation protocol sip message whether expression needs the medium grappling indication and the SDP response of ALG grappling medium;
ALG determines whether the grappling medium according to the said sip message of receiving.
Said AS need to determine whether ALG grappling medium to comprise:
Said AS is according to one of following or combination in any, and whether decision-making needs ALG grappling medium:
Whether the roaming information of the attaching information of SDP request initiator's user signing contract information, SDP request initiator's roaming information, SDP request purpose side, SDP request purpose side, SDP request initiator's home network the grappling medium.
Whether said decision-making needs ALG grappling medium specifically to comprise:
Said AS is according to SDP request initiator's user signing contract information, judges CAMEL-Subscription-Information and shows and need grappling, then determines grappling;
If SDP request initiator's CAMEL-Subscription-Information shows the suggestion grappling, the AS home network grappling medium whether of also further judging SDP request initiator then, if not grappling then judge further whether SDP request initiator roams, if roaming then determine grappling;
If not roaming then further according to the attaching information of SDP request purpose side, judges whether said purpose side is this carrier network user, if not then determining grappling;
If then, judge whether said purpose side is roamed, if roaming then determine grappling further according to the attaching information of SDP request purpose side;
Other situation then determine not grappling.
After said AS determines whether to need said ALG grappling medium, send said sip message before, also comprise:
When determining the grappling medium, said AS is carried at the media resource information relevant with ALG of carrying in the SDP request that receives in the SDP request of forwarding;
When determining not grappling medium, said AS asks the relevant media resource information of initiator with what carry in the SDP request that receives with SDP, is carried in the SDP request of forwarding.
Said ALG determines whether that according to the sip message of receiving the grappling medium comprise:
Said ALG sends the SDP response to SDP request initiator; Need grappling if confirm as through the indication of the said medium grappling in the said sip message; The media resource information of the medium processing entity of ALG distribution is carried in said SDP response, otherwise the media resource information of the medium processing entity of ALG distribution is not carried in said SDP response.
Whether said being used to need representes the medium grappling indication implementation method of ALG grappling medium to be:
The special sip message header field of said medium grappling indication employing identifies and need to indicate whether ALG grappling medium; Perhaps,
Said medium grappling indication is included in the said SDP response that said sip message carries.
When said medium grappling indication was included in the said SDP response that said sip message carries, said grappling indication implementation method was:
Adopt special SDP attribute-bit need to indicate whether ALG grappling medium; Perhaps,
Adopt and select specific capable effective or invalid indication of medium.
Said medium grappling indication is adopted when selecting capable effective or invalid indication of specific medium, and said grappling indication implementation method is:
When the media resource information corresponding medium relevant with ALG are capable when effective, showing needs the grappling medium; Perhaps, when the media resource information corresponding medium relevant with SDP request initiator are capable when invalid, showing needs the grappling medium.
A kind of system that realizes the medium grappling comprises ALG and AS at least, wherein,
ALG is used to transmit Session Description Protocol SDP request, and the media resource information that the media resource information received and ALG distribute is carried in the SDP request of said forwarding;
AS is used to receive the SDP request, and whether decision needs ALG grappling medium, and sends the sip message that carries the SDP response according to the result of decision.
If said AS decision needs ALG grappling medium; The corresponding medium of media resource information relevant with said ALG in the then said SDP response are capable effective, and the corresponding medium of media resource information relevant with SDP request initiator in the perhaps said SDP response are capable invalid.
Can find out from the technical scheme that the invention described above provides; After comprising that ALG receives the SDP request; In the SDP request that needs are transmitted, carry the media resource information in the SDP request of receiving, and the media resource information of the medium processing entity of ALG distribution, and transmit this SDP request; AS receives the SDP request, need to determine whether said ALG grappling medium; AS sends and carries session initiation protocol (SIP) message whether expression needs the medium grappling indication and the SDP response of ALG grappling medium; ALG determines whether the grappling medium according to the sip message of receiving.Through the existing signaling in the call establishment, AS has realized whether grappling medium of definite ALG, does not need extra signaling, has saved signaling consumption, thereby has shortened the call setup duration.
Description of drawings
Fig. 1 realizes the flow chart of the method for medium grappling for the present invention;
Fig. 2 realizes the composition structural representation of the system of medium grappling for the present invention;
Fig. 3 realizes the schematic flow sheet of first embodiment of medium grappling for the present invention;
Fig. 4 realizes the schematic flow sheet of second embodiment of medium grappling for the present invention.
Embodiment
Fig. 1 realizes the flow chart of the method for medium grappling for the present invention, and is as shown in Figure 1, may further comprise the steps:
After step 100:ALG receives SDP request, in the SDP request that needs are transmitted, carry the media resource information of the medium processing entity that media resource information and ALG in the said SDP request distribute, and transmit this SDP request.
In this step, in the SDP request that ALG receives, carry SDP request initiator's media resource information, and ALG can divide the media resource information (promptly relevant with ALG media resource information) that is used in the medium processing entity that connects SDP request purpose side.The SDP request that ALG transmits is forwarded to AS via S-CSCF.
The SDP request can be carried through the invitation INVITE of SIP.
Step 101:AS receives the SDP request, need to determine whether ALG grappling medium.
In this step; Whether AS is according to the home network of roaming information, SDP request or the INIVTE message originator of attaching information, SDP request or the INVITE purpose side of SDP request or INVITE initiator's user signing contract information, SDP request or INVITE initiator's roaming information, SDP request or INVITE purpose side one of grappling medium or combination in any, and whether decision-making transmits the media resource information relevant with ALG with grappling or not grappling medium.Such as:
If the CAMEL-Subscription-Information of SDP request or INIVTE message originator shows the suggestion grappling; The AS home network grappling medium whether of also further judging SDP request or INIVTE message originator then; If not grappling then further judge SDP request or whether the INVITE initiator roams, if roaming then determine grappling; If not roaming then further according to the attaching information of SDP request or INIVITE message purpose side, judges whether said purpose side is this carrier network user, if not then determining grappling; If then, judge whether said purpose side is roamed, if roaming then determine grappling further according to the attaching information of SDP request or INIVITE message purpose side; Other situation then determine not grappling.
In this step, when determining the grappling medium, also comprise: AS is carried in the SDP request that is transmitted to SDP request or INVITE purpose side the media resource information relevant with ALG of carrying in the SDP request that receives and transmission; When determining not grappling medium, AS asks the relevant media resource information of initiator with what carry in the SDP request that receives with SDP, is carried in the SDP request that is transmitted to SDP request or INVITE purpose side and also sends.
Step 102:AS sends and carries the sip message whether expression needs the medium grappling indication and the SDP response of ALG grappling medium.
In this step, sip message is transmitted to ALG via S-CSCF.
Whether be used to need to represent the medium grappling indication of ALG grappling medium that two kinds of implementations can be arranged: wherein a kind of mode is to adopt special sip message header field to identify and need to indicate whether ALG grappling medium; Another kind of mode is, medium grappling indication is included in the said SDP response that said sip message carries, and at this moment, grappling indication implementation method is: adopt special SDP attribute-bit need to indicate whether ALG grappling medium; Perhaps, adopt to select specific capable effective or invalid indication of medium, be specially: when the media resource information corresponding medium relevant with ALG capable effective (carrying), showing needs the grappling medium; Perhaps, when the media resource information corresponding medium relevant with SIP request initiator are capable when invalid, showing needs the grappling medium.
Step 103:ALG determines whether the grappling medium according to the sip message of receiving.Comprise: ALG sends the SDP response to SDP request or INVITE initiator; Need grappling if confirm as through the indication of the said medium grappling in the said sip message; Said SDP is to the media resource information of the medium processing entity that should carry the ALG distribution, otherwise the media resource information of the medium processing entity of ALG distribution is not carried in said SDP response.
In this step,, then be shown as when needing grappling in this sign if special sign is adopted in medium grappling indication; Perhaps; When if the medium line display is adopted in medium grappling indication; The media resource information corresponding medium relevant with ALG are capable when effective, or the media resource information corresponding medium relevant with SDP request or INVITE initiator are capable when invalid: ALG connects the media resource information of SDP request or INVITE initiator's medium processing entity in being used to of carrying in the SDP response that SDP request or INVITE initiator transmit that ALG distributes.So far, SDP request or INVITE initiator and ALG have consulted media resource, and ALG and SDP request or INVITE purpose side have consulted media resource; ALG control medium processing capacity entity is transmitted media data, realizing both sides' conversation, and has realized the function (promptly in media path) of grappling medium;
If special sign is adopted in medium grappling indication, then be shown as when not needing grappling in this sign; Perhaps; When if the medium line display is adopted in medium grappling indication; The media resource information corresponding medium relevant with ALG are capable when invalid, or the media resource information corresponding medium relevant with SDP request or INVITE initiator are capable when effective: ALG connects the media resource information of SDP request or INVITE initiator's medium processing entity in being used to of not carrying in the SDP response that SDP request or INVITE initiator transmit that ALG distributes.So far, SDP request or INVITE initiator ask with SDP or INVITE purpose side has consulted media resource, and ALG is not included in both sides' the conversation media path, i.e. grappling medium not.
Visible from the inventive method, through the existing signaling in the call establishment, AS has realized whether grappling medium of definite ALG, does not need extra signaling, has saved signaling consumption, thereby has shortened the call setup duration.
To the inventive method a kind of system that realizes the medium grappling is provided also, comprises ALG and AS at least, wherein,
ALG is used to transmit Session Description Protocol SDP request, and the media resource information that the media resource information received and ALG distribute is carried in the SDP request of said forwarding;
AS is used to receive the SDP request, and whether decision needs ALG grappling medium, and sends the sip message that carries the SDP response according to the result of decision.
If said AS decision needs ALG grappling medium; The corresponding medium of media resource information relevant with said ALG in the then said SDP response are capable effective, and the corresponding medium of media resource information relevant with SDP request initiator in the perhaps said SDP response are capable invalid.
One skilled in the art will appreciate that the information interaction between ALG and the AS transmits (among Fig. 2 for illustrating) through S-CSCF.
Below in conjunction with embodiment, the inventive method is described in detail.
Fig. 3 realizes the schematic flow sheet of first embodiment of medium grappling for the present invention; As shown in Figure 3, among first embodiment, UE-1 makes a call to callee UE-2 as the calling party; When UE-1 sets up the IMS session with UE-2; Session signaling is through ALG and AS, and information mutual between AS and the ALG is transmitted via S-CSCF, specifically may further comprise the steps:
Step 300:UE-1 sends Session Description Protocol SDP request (Offer): SDP1 to UE-2, is connected with the medium of UE-2 to set up, and such as through sending the invitation INVITE of session initiation protocol SIP, comprises the media resource information of UE-1 among the SDP1.
Step 301:SDP request or the INVITE that carries the SDP request are through ALG, and ALG divides the media resource that is used in the medium processing entity that connects the UE-2 end.
Step 302:ALG generates new SDP request: SDP2; In SDP2, promptly comprise the media resource information in the SDP request of receiving; The media resource information (representing with ALG1 among Fig. 3) that also comprises the medium processing entity that ALG distributes in the step 301 is transmitted the INVITE that carries SDP2 then.
Possibly also there are other processing entities between UE-1 and ALG; These processing entities forward after may revising the SDP request that receives; The ALG SDP request of receiving possibly be not SDP1 just like this; But amended SDP request still is used for setting up medium with UE-1 and is connected, so media resource information wherein still can be considered relevant with UE-1.
ALG comprises ALG1 in SDP2 can adopt; Such as, ALG1 comprises the voice medium resource information, and then relevant with UE-1 voice medium resource information is preceding; Otherwise the voice medium resource information of ALG1 in the back or, or the attribute of the voice medium resource information of ALG1 is " inactive ";
Step 303:SDP asks or carries the INVITE arrival S-CSCF of SDP request, and S-CSCF transmits the SDP request or carries the INVITE that SDP asks.
Step 304:SDP asks or carries the INVITE arrival AS of SDP request; Whether AS is according to the home network of roaming information, SDP request or the INIVTE message originator of attaching information, SDP request or the INVITE purpose side of SDP request or INVITE initiator's user signing contract information, SDP request or INVITE initiator's roaming information, SDP request or INVITE purpose side one of grappling medium or combination in any, and whether decision-making needs ALG grappling or not grappling medium.Such as:
If the CAMEL-Subscription-Information of SDP request or INIVTE message originator shows the suggestion grappling; The AS home network grappling medium whether of also further judging SDP request or INIVTE message originator then; If not grappling then further judge SDP request or whether the INVITE initiator roams, if roaming then determine grappling; If not roaming then further according to the attaching information of SDP request or INIVITE message purpose side, judges whether said purpose side is this carrier network user, if not then determining grappling; If then, judge whether said purpose side is roamed, if roaming then determine grappling further according to the attaching information of SDP request or INIVITE message purpose side; Other situation then determine not grappling.
Among first embodiment, suppose that the judged result of AS is the needs grappling.Not grappling of hypothesis AS medium are then carried out follow-up step 305～306 in the present embodiment, if AS grappling medium, then carry out by the anchored mode of standard step 305～306, because of irrelevant with the present invention, repeats no more.
Need to prove; Between ALG and AS, possibly also there are other processing entities; These processing entities forward after may revising the SDP request that receives; The AS SDP request of receiving possibly be not SDP2 just like this, is connected but amended SDP request still is used for setting up medium with the medium processing entity of UE-1 and ALG control, so media resource information wherein still can be considered relevant with UE-1 or ALG.
Step 305:AS generates new SDP request: SDP3; In SDP3, comprise the relevant media resource information (representing with ALG1 among Fig. 3) of ALG; And do not comprise UE-1 relevant with media resource information that ALG1 comprises in the identical media resource information of medium type; Comprise the voice medium resource information such as ALG1, then do not comprise the relevant voice medium resource information of UE-1 among the SDP3.
Step 306:SDP asks or carries the INVITE arrival UE-2 of SDP request; UE-2 uses the media resource information reconciliation medium in the SDP request of receiving; And transmission sip message; Message is carried the SDP response, and (English is translated into: Answer): SDP4 is a 200OK message such as sip message, and SDP4 carries the media resource information of UE-2.
Step 307:SIP message arrives AS, and AS carries the grappling indication with indication ALG grappling medium when transmitting sip message, and in message body, comprise new SDP response: SDP5 comprises the media resource information among the SDP4 that receives in SDP5.
Particularly, need to indicate whether ALG grappling medium such as the header field that uses sip message, perhaps the grappling indication is included among the SDP5, uses " a=" property column need to indicate whether ALG grappling medium; Perhaps; The grappling indication is included among the SDP5; SDP5 comprises that as many medium of value volume and range of product are capable and order is identical with SDP2; Among the SDP5 with SDP2 in the capable media resource information that partly comprises among the SDP4 that receives of the corresponding medium of ALG1, promptly media resource information corresponding medium relevant with ALG are capable effective among the SDP5; Among the SDP5 with SDP2 in the relevant capable middle port of the corresponding medium of media resource information of UE-1 all be set to 0, promptly media resource information corresponding medium relevant with UE-1 are capable invalid among the SDP5.
Step 308:SIP message arrives S-CSCF, and S-CSCF transmits sip message.
Step 309:ALG receives sip message, and the medium grappling dial gauge that carries in the judgement sip message is shown and needs grappling; Perhaps; Judge the corresponding medium of media resource information relevant in the SDP response in the sip message capable effectively (or judgement is capable invalid with the corresponding medium of media resource information that UE-1 is correlated with), then divide the media resource (representing with ALG2 among Fig. 3) that is used in the medium processing entity that connects the UE-1 end with ALG.
Step 310:ALG comprises new SDP response: SDP6 in message body when transmitting sip message, being used for of comprising in SDP6 that ALG distributes in the step 309 connects the media resource information (Fig. 3 representes with ALG2) of the medium processing entity of UE-1 end.
So far, UE-1 and ALG have consulted media resource, and ALG and UE-2 have consulted media resource, and ALG control medium processing capacity entity is transmitted the conversation that media data is realized UE-1 and UE-2, and has realized the function (promptly in media path) of grappling medium.
Fig. 4 realizes the schematic flow sheet of second embodiment of medium grappling for the present invention; As shown in Figure 4, among second embodiment, UE-1 makes a call to callee UE-2 as the calling party; When UE-1 sets up the IMS session with UE-2; Session signaling is through ALG and AS, and information mutual between AS and the ALG is transmitted via S-CSCF, specifically may further comprise the steps:
Step 400～step 403, in full accord with the realization of step 300～step 303 among first embodiment repeats no more here.
Step 404:SDP asks or carries the INVITE arrival AS of SDP request; AS is according to whether one of grappling medium or the combination of the roaming information of attaching information, SDP request or the INVITE purpose side of SDP request or INVITE initiator's user signing contract information, SDP request or INVITE initiator's roaming information, SDP request or INVITE purpose side, SDP request (INVITE) initiator's home network, and whether decision-making needs ALG grappling or not grappling medium.Such as:
If SDP request (INVITE) initiator's CAMEL-Subscription-Information shows the suggestion grappling; The AS home network grappling medium whether of also further judging SDP request (INVITE) initiator then; If not grappling then further judge SDP request or whether the INVITE initiator roams, if roaming then determine grappling; If not roaming then further according to the attaching information of SDP request or INIVITE message purpose side, judges whether said purpose side is this carrier network user, if not then determining grappling; If then, judge whether said purpose side is roamed, if roaming then determine grappling further according to the attaching information of SDP request or INIVITE message purpose side; Other situation then determine not grappling.
Among second embodiment, the judged result of supposing AS is not for needing grappling.Not grappling of hypothesis AS medium are then carried out follow-up step 305～306 in the present embodiment, if AS grappling medium, then carry out by the anchored mode of standard step 305～306, because of irrelevant with the present invention, repeats no more.
Need to prove; Between ALG and AS, possibly also there are other processing entities; These processing entities forward after may revising the SDP request that receives; The AS SDP request of receiving possibly be not SDP2 just like this, is connected but amended SDP request still is used for setting up medium with the medium processing entity of UE-1 and ALG control, so media resource information wherein still can be considered relevant with UE-1 or ALG.
Step 405:AS generates new SDP request: SDP3, in SDP3, only comprises the relevant media resource information of UE-1.
Step 406:SDP asks or carries the INVITE arrival UE-2 of SDP request; UE-2 uses the media resource information reconciliation medium in the SDP request of receiving; And transmission sip message; Message is carried the SDP response: SDP4 is a 200OK message such as sip message, and SDP4 carries the media resource information of UE-2.
Step 407:SIP message arrives AS, and AS carries the grappling indication with not grappling of indication ALG medium when transmitting sip message, and in message body, comprise new SDP response: SDP5 comprises the media resource information among the SDP4 that receives in SDP5.
Concrete, need to indicate whether ALG grappling medium such as the header field that uses sip message, perhaps the grappling indication is included among the SDP5, uses " a=" property column need to indicate whether ALG grappling medium; Perhaps; The grappling indication is included among the SDP5; SDP5 comprises that as many medium of value volume and range of product are capable and order is identical with SDP2; Among the SDP5 with SDP2 in the relevant capable media resource information that partly comprises among the SDP4 that receives of the corresponding medium of media resource information of UE-1; Be that corresponding medium of media resource information relevant with UE-1 among the SDP5 are capable effective, among the SDP5 with SDP2 in the capable middle port of the corresponding medium of ALG1 all be set to 0, promptly media resource information corresponding medium relevant with ALG are capable invalid among the SDP5.
Step 408:SIP message arrives S-CSCF, S-CSCF forwarded call sip message.
Step 409:ALG receives sip message, and the medium grappling dial gauge that carries in the judgement sip message is shown and does not need grappling; Perhaps; Judge the corresponding medium of media resource information relevant in the SDP response in the sip message capable invalid (or it is capable effective to judge the media resource information corresponding medium relevant with UE-1), connect being used to of then distributing in the release steps 401 that SDP asks or the media resource of the medium processing entity of INVITE purpose side with ALG.
Step 410:ALG comprises new SDP response: SDP6 in message body when transmitting sip message, in SDP6, comprise the efficient media resource information received in the step 408 (port numbers is that 0 media representation is invalid).
So far, UE-1 and UE-2 have consulted media resource, and ALG is not included in the conversation media path of UE-1 and UE-2, i.e. grappling medium not.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method that realizes the medium grappling is characterized in that, this method comprises:
After ALG ALG receives Session Description Protocol SDP request; In the SDP request that needs are transmitted, carry the media resource information in the SDP request that said ALG receives; And the media resource information of the medium processing entity of said ALG distribution, and transmit this SDP request;
Application server AS is received the SDP request, need to determine whether said ALG grappling medium, and transmission carries the session initiation protocol sip message whether expression needs the medium grappling indication and the SDP response of ALG grappling medium;
ALG determines whether the grappling medium according to the said sip message of receiving.
2. method according to claim 1 is characterized in that, said AS need to determine whether ALG grappling medium to comprise:
Said AS is according to one of following or combination in any, and whether decision-making needs ALG grappling medium:
Whether the roaming information of the attaching information of SDP request initiator's user signing contract information, SDP request initiator's roaming information, SDP request purpose side, SDP request purpose side, SDP request initiator's home network the grappling medium.
3. method according to claim 2 is characterized in that, whether said decision-making needs ALG grappling medium specifically to comprise:
Said AS is according to SDP request initiator's user signing contract information, judges CAMEL-Subscription-Information and shows and need grappling, then determines grappling;
If SDP request initiator's CAMEL-Subscription-Information shows the suggestion grappling, the AS home network grappling medium whether of also further judging SDP request initiator then, if not grappling then judge further whether SDP request initiator roams, if roaming then determine grappling;
If not roaming then further according to the attaching information of SDP request purpose side, judges whether said purpose side is this carrier network user, if not then determining grappling;
If then, judge whether said purpose side is roamed, if roaming then determine grappling further according to the attaching information of SDP request purpose side;
Other situation then determine not grappling.
4. method according to claim 1 is characterized in that, after said AS determines whether to need said ALG grappling medium, send said sip message before, also comprise:
When determining the grappling medium, said AS is carried at the media resource information relevant with ALG of carrying in the SDP request that receives in the SDP request of forwarding;
When determining not grappling medium, said AS asks the relevant media resource information of initiator with what carry in the SDP request that receives with SDP, is carried in the SDP request of forwarding.
5. method according to claim 1 is characterized in that, said ALG determines whether that according to the sip message of receiving the grappling medium comprise:
Said ALG sends the SDP response to SDP request initiator; Need grappling if confirm as through the indication of the said medium grappling in the said sip message; The media resource information of the medium processing entity of ALG distribution is carried in said SDP response, otherwise the media resource information of the medium processing entity of ALG distribution is not carried in said SDP response.
6. method according to claim 1 is characterized in that, whether said being used to need representes the medium grappling indication implementation method of ALG grappling medium to be:
The special sip message header field of said medium grappling indication employing identifies and need to indicate whether ALG grappling medium; Perhaps,
Said medium grappling indication is included in the said SDP response that said sip message carries.
7. method according to claim 6 is characterized in that, when said medium grappling indication was included in the said SDP response that said sip message carries, said grappling indication implementation method was:
Adopt special SDP attribute-bit need to indicate whether ALG grappling medium; Perhaps,
Adopt and select specific capable effective or invalid indication of medium.
8. method according to claim 7 is characterized in that, said medium grappling indication is adopted when selecting capable effective or invalid indication of specific medium, and said grappling indication implementation method is:
When the media resource information corresponding medium relevant with ALG are capable when effective, showing needs the grappling medium; Perhaps, when the media resource information corresponding medium relevant with SDP request initiator are capable when invalid, showing needs the grappling medium.
9. a system that realizes the medium grappling is characterized in that, comprises ALG and AS at least, wherein,
ALG is used to transmit Session Description Protocol SDP request, and the media resource information that the media resource information received and ALG distribute is carried in the SDP request of said forwarding;
AS is used to receive the SDP request, and whether decision needs ALG grappling medium, and sends the sip message that carries the SDP response according to the result of decision.
10. system according to claim 9; It is characterized in that; If said AS decision needs ALG grappling medium; The corresponding medium of media resource information relevant with said ALG in the then said SDP response are capable effective, and the corresponding medium of media resource information relevant with SDP request initiator in the perhaps said SDP response are capable invalid.
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| CN201010236068.1A CN102340490B (en) | 2010-07-23 | 2010-07-23 | A kind of method and system realizing anchor of media |
| PCT/CN2011/075608 WO2012010019A1 (en) | 2010-07-23 | 2011-06-10 | Method and system for realizing media anchoring |
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| CN201010236068.1A CN102340490B (en) | 2010-07-23 | 2010-07-23 | A kind of method and system realizing anchor of media |
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| CN102340490B (en) | 2015-10-21 |
| WO2012010019A1 (en) | 2012-01-26 |
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