Req 32 an ims service provider shall ensure that the

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- REQ 3.2: An IMS service provider shall ensure that the private IMS identity provided in the authorization information from REQ 3.2 belongs to an IMS subscription in the pool of IMS subscriptions uniquely assigned to the WWSF. - REQ 3.3: The eP-CSCF shall verify that the WIC establishing the signalling connection with the eP-CSCF comes from a trusted domain. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 138 Release 12
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X.4.2 Solution 3. 1 for Scenario 3 X.4.2.1 General In this the present registration scenario it is assumed that the ”WWSF is provided with a pool of subscriptions with IMS and can assign individual Public User Identities within this pool.” (quoted from TS 23.228). This assignment is temporary and the same IMPU (and IMPI) may be re-assigned to a different user at a later time once they are free and available for re-use. The user’s web identity may be authenticated by the WWSF or the WAF. (Whether it is the WWSF or the WAF depends on the deployment.), but the WWSF may decide not to authenticate the user. Unauthenticated users are anonymous to the authentication service WWSF and WAF, but may still be authorized for IMS service. NOTE 1: The difference to the registration scenario addressed in clause X.3 is that, in the present registration scenario, the IMS subscriber is the WWSF, not the user. There is no linkage between the user’s web identity that may be authenticated by an authentication service the WWSF or the WAF and the assigned IMS identities. NOTE 2: Considerations on Lawful Interception, e.g. when the user is anonymous to the third party, are outside the scope of the present document. Editor’s Note: The consistent use of the terms third party authentication service, authentication service, WWSF, WAF, authorization server, etc. is ffs . X.4.2.2 Requirements All requirements for solution 3. 1 are covered in clause X.4.1. X.4.2.3 Procedures The procedure provided in this clause is split into a normative part and non-normative part: the description for the interfaces between eP-CSCF, I-/S-CSCF and HSS is normative while the description for the interfaces W1, W2 and W4 is only by way of example. NOTE 3: This split into a normative part and a non-normative part is due to 3GPP’s decision not to standardise the interfaces W1, W2 and W4 in the present release. For the non-normative part, the procedure allows for various realisations that are out of scope of 3GPP for the present release. All realisations have in common that the WAF issues authorization tokens that are provided to the WIC via the WWSF. The WIC presents this authorization token to the eP-CSCF during the IMS registration. The validation of the authorization token by the eP-CSCF is specific to the particular realisation. The authorization token allows the eP-CSCF to retrieve the IMS subscriber identity, the WAF and WWSF identities, validity period, and possible other authorization parameters.
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