11 Identities

23.2313GPPRelease 17SIP-I based circuit-switched core networkStage 2TS

11.1 Telephone numbering schemes

(G)MSC-Servers shall support the receipt of Tel-URI and SIP URI (user=phone) and the sending of Tel-URI. The sending of SIP URI (user=phone) may be supported as an option. Both global and local telephone numbering formats shall be supported as per IETF RFC 3966 [10].

11.2 (G)MSC Server Identity

Editor’s Note: The (G)MSC Server Identity is FFS.

11.3 Sub-addressing

When using a Tel URI or a SIP-URI, the "isub" parameter defined within IETF RFC 3966 [10] may be used to include the ISDN sub-address as may be required within the MSISDN. See 3GPP TS 23.003 [28]. When the "isub" parameter is present, the "isub-encoding" parameter defined within IETF RFC 4715 [29] shall be used to define the ISDN subaddress encoding type.

The procedures specified within ITU-T Q.1912.5 [9] Annex B.5 for profile C shall be applied for Sub-addressing.