9 Compatibility Issues

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

9.1 Compatibility Issues for Nc Interface

A Release 8 (or later) (G)MSC-S implementing a SIP-I based Nc interface, according to 3GPP TS 23.231, is backward compatible with a Release 7 (or earlier) (G)MSC-S or (G)MSC by implementing the interworking procedures defined in 3GPP TS 29.235 [21].

9.2 Compatibility Issues for Mc Interface

A Release 8 (or later) (G)MSC-S implementing a SIP-I based Nc interface, according to 3GPP TS 23.231, shall be deployed with a Release 8 (or later) MGW implementing at least Version 4 of the 3GPP Mc Profile Name "Threegbicsn" defined in 3GPP TS 29.232 [8].