X.1 Scope

24.2293GPPIP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Release 18Stage 3TS

This annex describes support for SBA for IMS nodes.

IMS nodes can use the SBA interfaces described in the present Annex as an alternative to the Diameter Rx and Cx and Sh reference points based on configuration. To support co-existence of IMS nodes supporting SBA services and IMS nodes not supporting SBA services SBI, enabled IMS nodes can support both SBI and non-SBI interfaces.

While the main body of the present document only describes usage of Diameter Rx and Cx and Sh reference points, the usage of the equivalent SBA services is a valid option.

NOTE 1: This version of the specification does not specify the details for usage of SBIs by P-CSCF, S-CSCF, I-CSCF and AS in the main body of the specification.

NOTE 2: This annex is intended to be used in conjunction with 5GC, see Annex U and Annex W.