ITU Q.1912.5:2004
ITU Q.1912.5:2004 Interworking Between Session Initiation Protocol (sip) And Bearer Independent Call Control Protocol Or Isdn User Part Defines the signalling interworking between the Bearer Independent Call Control (BICC) or ISDN User Part (ISUP) protocols and SIP in order to support services that can be commonly supported by BICC or