L.0 General

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

The called IN number and original called IN number are optional parameters defined in ITU-T Recommendation Q.763 [4].

The SIP History-Info header field (including the mp-param parameter) is defined in IETF RFC 7044 [91], the cause-param URI parameter is defined in IETF RFC 4458 [113] and the cause-param value "380" is defined in IETF RFC 8119 [148].