X.1 Introduction

33.2033G Security3GPPAccess security for IP-based servicesTS

This annex specifies the security required for the signalling procedures described in TS 23.228 [3] for WebRTC IMS Client access to IMS.

The provisions in the present annex are optional for implementation. The provisions in the present annex are optional for use.

For this release of the present specification, only the descriptions relating to the reference points in the IMS core, i.e. the interfaces between eP-CSCF, I-CSCF, S-CSCF, and HSS are normative. The descriptions of the reference points between WIC, WWSF, and eP-CSCF are of informative nature only. The latter are therefore to be considered as examples only, and implementations may be compliant with this specification and yet realise the reference points between WIC, WWSF, and eP-CSCF in a way different from the one described in the present annex.

The present annex is structured according to the three registration scenarios for WebRTC IMS Clients described in TS 23.228 [3].

This annex also describes solutions for TURN credential provisioning and authentication of WebRTC IMS clients when ICE/TURN is used as a mechanism to provide solution for traversing symmetric NAT and restrictive firewalls.