Note the ts 24229 8 defines a trust domain that

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NOTE: The TS 24.229 [8] defines a trust domain that consists of the P-CSCF, the I-CSCF, the S-CSCF, the BGCF, the MGCF, the MRFC and all the AS:s that are not provided by 3rd party service providers. There are nodes in the edge of the trust domain that are allowed to provide with an asserted identity header. The nodes in the trust domain will trust SIP messages with asserted identity headers. The asserted identity information is useful as long as the interfaces in an operator’s network can be trusted. If a UE manages to bypass the P-CSCF it presents at least the following problems: 1) The P-CSCF is not able to generate any charging information. 2) Malicious UE could masquerade as some other user (e.g. it could potentially send INVITE or BYE messages). The following recommendations for preventing attacks based on such misbehavior are given: - Access to S-CSCF entities shall be restricted to the core network entities that are required for IMS operation, only. It shall be ensured that no UE is able to directly send IP packets to IMS-entities other than the required ones, ie. assigned P-CSCF, or HTTP servers. - Impersonation of IMS core network entities at IP level (IP spoofing), especially impersonation of P-CSCFs by UEs shall be prevented. - It is desirable to have a general protection mechanism against UEs spoofing (source) IP addresses in any access network providing access to IMS services. If the traffic is between two non-IMS CSCFs, it is recommended to use TLS mechanisms as specified in RFC 3261 [6]. This will mitigate the problems caused by misbehaviour of the UE. TLS certificate management as outlined in TS 33.310 [24] can be used between two non-IMS CSCFs. If neither intra-CSCF traffic nor CSCF-SEG traffic can be trusted and if this traffic is not protected by the NDS/IP, TS 33.210 [5] mechanisms, then physical protection measures or IP traffic filtering should be applied. This is anyhow not in the scope of 3GPP specification. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 56 Release 12
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Annex K: Void 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 57 Release 12
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Annex L (Normative): Application to fixed broadband access L.1 Introduction This Annex specifies how the material in the main body and other normative Annexes of the present document apply to the TISPAN NGN (ETSI ES 282 001 [26] ). NOTE 1: NGN specific abbreviations and terminology can be found in ETSI ES 282 001 [26]. NOTE 2 : In the context of this Annex the term NGN-UE denotes the UE as defined in ETSI ES 282 001 [26] L.2 Application of clause 4 In 3GPP IMS, the ISIM is mandated to be present on UICC which is usually inserted within the MT component of the UE. In NGN-UEs, the ISIM shall be provided on the UICC, which shall be inserted within either : 1) The TE; or 2) The IMS Residential Gateway (IRG). NOTE: The exact definition of IRG can be found in ETSI TS 187 003 [57].
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