Where the te and irg each contain an uicc with an

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Where the TE and IRG each contain an UICC with an ISIM, the ISIM should be used in following order of preference TE, IRG. UPSF Home NGN I-CSCF Visited NGN P-CSCF Generic IP Transport ISIM NGN-UE MM IP networks S-CSCF 1 2 5 3 3 4/5 4/5 UA GE GE Figure L.1 Figure L.1 redraws figure 1 of the main body of the present document replacing the 3GPP specific transport domain by Generic IP transport domain. The following observations support figure L.1. 1) The IMS is independent of the transport network 2) Generic Entities (GE) equivalent to the 3GPP transport entities will be present in the Generic IP transport domain. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 58 Release 12
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3) In the NGN architecture the AuC/HSS functionality is performed by the UPSF. 4) The Security Associations (SA) (referring to the corresponding arrows in Figure L.1) are retained: a) SA-1, SA-3, SA-4 and SA-5 are endorsed by this annex b) SA-2 is endorsed by this Annex with the extension to ensure transport across NAT/Firewall boundaries. There exist other interfaces and reference points in IMS, which have not been addressed above. Those interfaces and reference points reside within the IMS, either within the same security domain or between different security domains (See figure L.2). The protection of all such interfaces and reference points (which may include other subsystems) apart from the Gm reference point are protected as specified in TS 33.210 [5]. UPSF Home Network NGN-UE I-CSCF S-CSCF Zb Zb Zb Zb Zb Zb Generic IP transport Netw. P-CSCF NGN-UE Visited Net. Figure L.2 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 59 Release 12
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Annex M (normative): Enhancements to the access security for IP based services to enable NAT traversal for signaling messages M.0 General NOTE: Annex M.x (x= 1, 2, …) in this annex corresponds to clause x in the body of this specification. M.1 Scope It is assumed for the purposes of this annex that a NAT device may be located between the UE and the P-CSCF. Only NATs outside the borders of an IMS network are considered, i.e. NATs are assumed to be located at the subscriber's site or in the access network. If there are multiple NATs in either of these locations, it is assumed that their effect sums up in such a way that they can be treated as a single NAT so that the mechanisms described below are still valid. In this annex enhancements to sections 4 through 8 of this specification are specified that allow a UE and a P-CSCF to detect whether they are located behind a NAT device, to inform each other about their NAT traversal capabilities, and, if there is a NAT present, to securely communicate. If there is no NAT device present, the procedures of sections 6, 7 and 8 apply. Examples of subscribers who are, in general, located behind a NAT device include subscribers accessing IMS via a DSL line.
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