Bøker av Alan Johnston

Henry Hunter Calvert was a British consul in Alexandria from 1857 to 1882, at which date he and many others fled from the riots in the city. The consulate was sacked, destroying Calvert's collections, but an annotated list of the Greek amphora stamps had been sent to the British Museum, published here for the first time.

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.