F.1 XCAP over Ut interface

34.229-13GPPInternet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Part 1: Protocol conformance specificationRelease 16TSUser Equipment (UE) conformance specification

The generic UE requirements for XCAP over Ut interface are specified in 3GPP TS 24.623 [ 105] clauses 4, 5.1, 5.2.1, 5.3.1 and 6.

The generic UE requirements for XCAP authentication over Ut interface are specified in 3GPP 24.623 [ 105] clause 5.2.1.1 and TS 33.220 clauses 4 and 4.3.1

[TS 24.623 clause 5.2.1.1]:

For systems where Generic Authentication Architecture is used, the UE shall support the authentication mechanisms specified in 3GPP TS 33.222 and 3GPP TS 24.109.

For systems where Generic Authentication Architecture is not used, the UE shall support RFC 2617 and RFC 2246 according to ETSI TS 183 038.

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[TS 33.220 clause 4]:

The 3GPP authentication infrastructure, including the 3GPP Authentication Centre (AuC), the USIM or the ISIM, and the 3GPP AKA protocol run between them, is a very valuable asset of 3GPP operators. It has been recognised that this infrastructure could be leveraged to enable application functions in the network and on the user side to establish shared keys. Therefore, 3GPP can provide the "bootstrapping of application security" to authenticate the subscriber by defining a Generic Bootstrapping Architecture (GBA) based on AKA protocol.

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[TS 33.220 clause 4.3.1]:

The reference point Ub is between the UE and the BSF. Reference point Ub provides mutual authentication between the UE and the BSF. It allows the UE to bootstrap the session keys based on 3GPP AKA infrastructure.

The HTTP Digest AKA protocol, which is specified in RFC 3310, is used on the reference point Ub. It is based on the 3GPP AKA TS 33.102 protocol. The interface to the USIM is as specified in TS 31.102 and to the ISIM is as specified in TS 31.103.