RFC3666 Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows
RFC3666 Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows A. Johnston, S. Donovan, R. Sparks, C. Cunningham, K. Summers [ December 2003 ] ( TXT = 200478 bytes)(Also BCP76)
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