摘要:Essential reading for anyone involved in the development and operation of voice or data networks, SIP: Understanding the Session Initiation Protocol is a ground-breaking book that quickly provides a thorough understanding of this revolutionary protocol for IP telephony. It shows how SIP offers a highly scalable and cost-effective way to offer new and exciting telecommunication feature sets, helping professionals design their "next generation" networks and develop new applications and software stacks. Discussions include SIP as a key component in the Internet multimedia conferencing architecture, request and response messages, devices in a typical network, types of servers, SIP headers, comparisons with existing signaling protocols including H.323, related protocols SDP (Session Description Protocol) and RTP (Real-time Transport Protocol), and the future direction of SIP. Detailed call flow diagrams illustrate how this technology works with other protocols such as H.323 and ISUP.
