3rdGenerationPartnershipProject;TechnicalSpecificationGroupServicesandSystemAspects;IPMultimediaSubsystem(IMS);.doc

3gpp ts 23.228 v11.3.0 (2011-12)technical specification3rd generation partnership project;technical specification group services and system aspects;ip multimedia subsystem (ims);stage 2(release 11)the present document has been developed within the 3rd generation partnership project (3gpp tm) and may be further elaborated for the purposes of 3gpp.the present document has not been subject to any approval process by the 3gpp organizational partners and shall not be implemented.this specification is provided for future development work within 3gpp only. the organizational partners accept no liability for any use of this specification.specifications and reports for implementation of the 3gpp tm system should be obtained via the 3gpp organizational partners publications offices.3gpp ts 23.228 v11.3.0 (2011-12)278release 11keywordslte, gsm, umts, multimedia, packetmode, ip3gpppostal address3gpp support office address650 route des lucioles - sophia antipolisvalbonne - francetel.: +33 4 92 94 42 00 fax: +33 4 93 65 47 16internetcopyright notificationno part may be reproduced except as authorized by written permission.the copyright and the foregoing restriction extend to reproduction in all media. 2011, 3gpp organizational partners (arib, atis, ccsa, etsi, tta, ttc).all rights reserved.umts is a trade mark of etsi registered for the benefit of its members3gpp is a trade mark of etsi registered for the benefit of its members and of the 3gpp organizational partnerslte is a trade mark of etsi currently being registered for the benefit of its members and of the 3gpp organizational partnersgsm and the gsm logo are registered and owned by the gsm associationcontentsforeword121scope132references133definitions, symbols and abbreviations163.1definitions163.2symbols183.3abbreviations194ip multimedia subsystem concepts204.0general204.1relationship to cs domain and the ip-connectivity access network214.2ims services concepts224.2.1home-network based servicessupport of camel or insupport of osadynamic services interactions handling.1service information exchanged between application servers.2handling by the application server.3deletion of services interaction information224.2.2support of numbers in non-international format in the ims234.2.3support of roaming users234.2.4ip multimedia subsystem service control interface (isc)244.2.4ahss to service platform interface274.2.4bscscf service control model284.2.4ci-cscf to as reference point (ma)294.2.5the qos requirements for an im cn subsystem session304.2.6qos requirements for im cn subsystem signalling314.2.7support of sip forking3sip forking3forking within and outside the im cn subsystem3support for forked requests334.3naming and addressing concepts334.3.1address management334.3.2void334.3.3identification of users3general3private user identities3public user identities3aglobally routable user agent uri (gruu)3a.1architecture requirements3bwildcarded public user identity3routing of sip signalling within the ip multimedia subsystem3ahandling of dialled number formats3btermination of session with the tel uri format public user identity3relationship of private and public user identities3relationship of public user identities, gruus, and ues384.3.4identification of network nodes394.3.5e.164 address to sip uri resolution in an im cn subsystem3enum/dns translation mechanism3handling of tel uris3handling of sip uris representing a telephone number404.3.6public service identities404.4signalling concepts404.5mobility related concepts414.6roles of session control functions424.6.0general424.6.1proxycscf424.6.2interrogatingcscf4general4void434.6.3servingcscf434.6.4breakout gateway control function454.6.5void464.7multimedia resource function464.7amedia resource broker474.8security concepts474.9charging concepts474.10ims group management concepts484.10.0general484.10.1ims group administration484.10.2group identifiers484.11relationship to 3gpp generic user profile (gup)484.12network address translation traversal in access network484.13identification of ims communication services484.13.1general484.13.2identification of ims communication services484.13.3identification of ims applications504.14border control concepts514.15ims in transit network scenarios524.15.1general concepts524.15.2ims transit network configurations524.15.3providing ims application services in transit network scenarios524.15aroaming architecture for voice over ims with local breakout534.16support of multimedia telephony544.16.1telephony application server544.16.2identification of multimedia telephony544.16.3session setup principles544.17support of short message service554.17.1ip short message gateway (ip-smgw)554.18support of number portability554.18.1number portability554.19support of preferred circuit carrier access and per call circuit carrier selection564.19.1preferred circuit carrier access and per call circuit carrier selection564.20support of ims service centralization and continuity564.21support of overlap signalling564.22support of explicit congestion notification (ecn)564.22.1general564.22.2cs geran/utran interworking at mgcf/im-mgw574.22.3interworking with non-ecn ip network and/or terminal at ibcf/trgw574.22.4interworking with non-3gpp ecn ip terminal at ibcf/trgw584.22.5ecn support at ims-alg/ims-agw584.22.6ecn support at mrfc/mrfp594.22.7cs geran/utran interworking at the msc server enhanced for ics/msc server enhanced for srvcc with sip/cs-mgw595ip multimedia subsystem procedures595.0general595.0asession-unrelated procedures595.1cscf related procedures605.1.0establishing ip-connectivity access network bearer for im cn subsystem related signalling605.1.1procedures related to proxycscf discovery60general60dhcp/dns procedure for pcscf discovery60void615.1.2procedures related to servingcscf assignment6assigning a servingcscf for a user6cancelling the servingcscf assignment6void625.1.3procedures related to interrogatingcscf625.1.4procedures related to proxycscf635.1.5subscription updating procedures6general6subscription updating information flow635.2application level registration procedures635.2.0general635.2.1requirements considered for registration635.2.1aimplicit registration645.2.1a.0general645.2.1a.1implicit registration for ue without isim or imc665.2.2registration flows6requirements to consider for registration6assumptions6registration information flow user not registered6re-registration information flow user currently registered6stored information.705.3application level de-registration procedures715.3.1mobile initiated de-registration715.3.2network initiated de-registration7general7network initiated application (sip) de-registration, registration timeout7network initiated application (sip) de-registration, administrative7.0general7.1network initiated de-registration by hss, administrative7.2network initiated de-registration by service platform745.4procedures for ip multi-media sessions765.4.0general765.4.1bearer interworking concepts765.4.2interworking with internet765.4.2aip version interworking765.4.3interworking with pstn775.4.4requirements for ip multi-media session control785.4.5session path information7session path information during registration and session initiation7pcscf in the session path7scscf in the session path795.4.6end-user preferences and terminal capabilities7general7objectives7end-user expectations7mechanism for bearer establishment80session progress indication to the originating ue825.4.7interaction between qos and session signalling8general8authorize qos resources8aresource reservation with policy and charging control8enabling of media flows8disabling of media flows8revoke authorization for ip-connectivity access network and ip resources8indication of ip-connectivity access network bearer release8authorization of ip-connectivity access network bearer modification8indication of ip-connectivity access network bearer modification845.4.8qos-assured preconditions855.4.9event and information distribution8general8subscription to event notifications875.4.10void885.4.11signalling transport interworking885.4.12configuration and routing principles for public service identities8general8psis on the originating side8psis on the terminating side8subdomain based psis8psi configuration in the hss8requests originated by the as hosting the psi895.4.13transcoding concepts905.4aoverview of session flow procedures905.4a.1end-to-end session flow procedures905.4a.2transit network session flow procedures935.5servingcscf/mgcf to servingcscf/mgcf procedures955.5.0general955.5.1(s-s#1) different network operators performing origination and termination955.5.2(s-s#2) single network operator performing origination and termination975.5.3(s-s#3) session origination with pstn termination in the same network as the scscf.1005.5.4(s-s#4) session origination with pstn termination in a different network from the scscf.1025.6origination procedures1045.6.0general1045.6.1(mo#1) mobile origination, roaming1045.6.2(mo#2) mobile origination, home1075.6.3(pstn-o) pstn origination1095.6.4(ni-o) non-ims origination procedure from an external sip client1105.6.5application server origination procedure1(as-o) origination at application server1void1scscf selection by icscf for as originating call procedures1145.7termination procedures1165.7.0general1165.7.1(mt#1) mobile termination, roaming1165.7.2(mt#2) mobile termination, home1195.7.2a(mt#3) mobile termination, cs domain roaming1215.7.3(pstn-t) pstn termination1215.7.4(ni-t) non-ims termination to an external sip client1235.7.5(as-t#1) psi based application server termination direct1255.7.6(as-t#2) psi based application server termination indirect1255.7.7(as-t#3) psi based application server termination dns routing1265.7.8(ast#4) termination at application server based on service logic1275.7aprocedures for the establishment of sessions without preconditions1285.7a.1general1285.7a.2procedures for the establishment of sessions without preconditions - no resource reservation required before session becomes active1305.7a.3void1325.8procedures related to routing information interrogation1325.8.0general1325.8.1user identity to hss resolution1325.8.2slf on register1335.8.3slf on ue invite1345.8.4slf on as access to hss1355.9routing of mid-session signalling1355.10session release procedures1365.10.0general1365.10.1terminal initiated session release1365.10.2pstn initiated session release1385.10.3network initiated session release13removal of ipcan bearers used to transport ims sip signalling13network initiated session release - pcscf initiated13.0general13.1network initiated session release - pcscf initiated after removal of ip-connectivity access network bearer140.2void14network initiated session release - scscf initiated1415.11procedures to enable enhanced multimedia services1425.11.1session hold and resume procedures14general14mobile-to-mobile session hold and resume procedures14mobile-initiated hold and resume of a mobile-pstn session14pstn-initiated hold and resume of a mobile-pstn session1465.11.2procedures for anonymous session establishment14general14signalling requirements for anonymous session establishment14bearer path requirements for anonymous session establishment1485.11.3procedures for codec and media characteristics flow negotiations14general14codec and media characteristics flow negotiation during initial session establishment14codec or media characteristics flow change within the existing reservation15codec or media characteristics flow change requiring new resources and/or authorization15sample mm session flow - addition of another media1565.11.4procedures for providing or blocking identity15general15procedures for providing the authenticated identity of the originating party15procedures for blocking the identity of the originating party16procedures for providing the authenticated identity of the originating party (pstn origination)16procedures for providing the authenticated identity of the originating party (pstn termination)1625.11.5session redirection procedures16general16session redirection initiated by scscf to ims16session redirection to pstn termination (scscf #2 forwards invite)16asession redirection to pstn termination (redirect to originating ue#1)16session redirection initiated by scscf to general endpoint (redirect to originating ue#1)16session redirection initiated by pcscf16session redirection initiated by ue16session redirection initiated by originating ue#1 after bearer establishment (redirect to originating ue#1)1695.11.6session transfer procedures170general170refer operation170application to session transfer services17.0general17.1blind transfer and assured transfer17.2consultative transfer17.3three-way session1735.12mobile terminating call procedures to unregistered public user identities1745.12.0general1745.12.1mobile terminating call procedures to unregistered public user identity that has services related to unregistered state1745.12.2mobile terminating call procedures to unregistered public user identity that has no services related to unregistered state1765.13ims emergency sessions1765.14interactions involving the mrfc/mrfp1765.14.0general1765.14.1interactions between the ue and the mrfc1765.14.2service control based interactions between the mrfc and the as1775.14.3interactions for services using both the ut interface and mrfc capabilities1775.14.4transcoding services involving the mrfc/mrfp1775.15mobile terminating session procedure for unknown user1785.15.0general1785.15.1unknown user determined in the hss.1785.15.2unknown user determined in the slf1795.16ims messaging concepts and procedures1795.16.0general1795.16.1immediate messaging17general17procedures to enable immediate messaging180.0general180.1immediate messaging procedure to registered public user identity180.2immediate messaging procedure to unregistered public user identity18immediate messages with multiple recipients1825.16.2session-based messaging18general18architectural principles18procedures to enable session based messaging18.0general18.1session based messaging procedure to registered public user identity18.2session based messaging procedure using multiple ues18.3session based messaging procedure with an intermediate node18.4session based messaging release procedure18.5session based messaging release procedure with an intermediate node1895.17refreshing sessions1895.18void1905.19support for transit scenarios in ims1905.19.1general1905.19.2providing ims application services in transit network scenarios1915.20procedures for assigning, using, and processing gruus1925.20.1ue19obtaining a gruu during registration19using a gruu19using a gruu while requesting privacy1935.20.2servingcscf19allocating a gruu during registration19using a gruu1935.20.3interrogatingcscf1935.20.3ahss1945.20.4elements other than ue acting as a ua19using a gruu19assigning a gruu1945.21ims multimedia priority services procedures194annex a (informative):information flow template196annex b (informative):void198annex c:void199annex d:void200annex e (normative):ip-connectivity access network specific concepts when using gprs and/or eps to access ims201e.0general201e.1mobility related concepts201e.1.0general201e.1.1procedures for pcscf discovery201e.1.1.0general201e.1.1.1gprs/eps procedure for pcscf discovery202e.2qos related concepts203e.2.1application level signalling for ims203e.2.1.0ge