Chapter 8. IP Telephony Solutions

IP Telephony represents the convergence of two distinct and dominant communications technologies: circuit-switched telephony and packet-switched, IP-based data networks. The impact of this convergence has been staggering in terms of the proliferation and development of new protocols, products, and communications solutions.

In November 1996, the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) approved the first version of H.323 recommendation, titled “Packet-Based Multimedia Communications Systems.” In March 1999, the Internet community followed with the publication of RFC 2543, which specifies the Session Initiation Protocol (SIP), considered by some a competitor to H.323. ...

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