This Recommendation specifies the diversion supplementary services (SS-DIV), which comprise the services Call Forwarding Unconditional (SS-CFU), Call Forwarding Busy (SS-CFB), Call Forwarding No Reply (SS-CFNR) and Call Deflection (SS-CD), all of which are applicable to various basic services supported by H.323 endpoints.
ITU-T H.450.3-2011 history
2011ITU-T H.450.3-2011 (Pre-Published) Call diversion supplementary service for H.323
1998ITU-T H.450.3-1998 Call Diversion Supplementary Service for H.323 - Series H: Audiovisual and Multimedia Systems - Supplementary Service for Multimedia Study Group 16; 70 pp