References
Chapter 2
Internet Engineering Task Force, SIP: Session Initiation Protocol, http://www.ietf.org/rfc/rfc3261.txt ( 2002).
Internet Engineering Task Force, RTP: A Transport Protocol for Real-Time Applications, http://www.ietf.org/rfc/rfc3550.txt ( 2003).
Internet Engineering Task Force, SDP: Session Description Protocol, http://www.ietf.org/rfc/rfc4566.txt ( 2006).
Internet Engineering Task Force, RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals, http://www.ietf.org/rfc/rfc4733.txt ( 2006).
International Telecommunication Union, Packet-based multimedia communications systems, http://www.itu.int/rec/T-REC-H.323 ( 2006).
International Telecommunication Union, ISDN user-network interface layer 3 specification for basic call ...

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