DS EN 300256:2006
DS EN 300256:2006 Private Integrated Services Network (Pisn) - Specification, Functional Models And Information Flows - Call Diversion Supplementary Service Defines the call diversion Supplementary Services: - Call Forwarding Unconditional (SS-CFU); - Call Forwarding Busy (SS-CFB); - Call Forwarding No Reply (SS-CFNR); - Call Deflection (SS-CD).