Search results for ""author alan johnston""

Henry Hunter Calvert died at his family house at Çannakale in 1880 a few months after escaping from the rioting in Alexandria where he was British consul. The consulate was sacked and his collections destroyed. He had however sent an annotated list of his Greek amphora stamps to the British Museum, presumably to Charles Newton, with whom he and his brother Frank had frequent correspondence. This list was forgotten until the present writer ‘found’ it in a box-file in the Department of Greek and Roman Antiquities (its title at the time). Henry Hunter Calvert’s Collection of Amphora Stamps and that of Sidney Smith Saunders publicly presents that material.

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Now in its fourth edition, the ground-breaking Artech House bestseller SIP: Understanding the Session Initiation Protocol offers you the most comprehensive and current understanding of this revolutionary protocol for call signaling and IP Telephony. The fourth edition incorporates changes in SIP from the last five years with new chapters on internet threats and attacks, WebRTC and SIP, and substantial updates throughout. This cutting-edge book shows how SIP provides a highly-scalable and cost-effective way to offer new and exciting telecommunication feature sets, helping practitioners design "next generation" network and develop new applications and software stacks. Other key 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.

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