7.5 IMS Supplementary Services

29.1633GPPInterworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networksTS

The following clauses describe the MGCF behaviour related to supplementary services as defined in ITU-T Recommendations Q.730 to ITU-T Q.737 [42] when interworking with an IMS which uses a Multimedia Telephony Application Server (MTAS) providing supplementary services according to 3GPP TS 24.173 [88]. The support of the related procedures is optional.