Documents related to 'public switched telephone network'
2002, RFC3398: Integrated Services Digital Network (ISDN) User Part (ISUP) to Session Initiation Protocol (SIP) Mapping
2003, RFC3578: Mapping of Integrated Services Digital Network (ISDN) User Part (ISUP) Overlap Signalling to the Session Initiation Protocol (SIP)
2005, RFC3976: Interworking SIP and Intelligent Network (IN) Applications