Request For Comments storage

	Author Info S. Donovan 2000, October The SIP INFO Method 2003, December Session Initiation Protocol (SIP) Basic Call Flow Examples 2003, December Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows 2005, April Session Timers in the Session Initiation Protocol (SIP) 2008, October Session Initiation Protocol Service Examples