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![Cover for Alan Johnston · SIP: Understanding the Session Initiation Protocol, Fourth Edition (Hardcover Book) [Unabridged edition] (2015)](https://imusic.b-cdn.net/images/item/original/639/9781608078639.jpg?alan-johnston-2015-sip-understanding-the-session-initiation-protocol-fourth-edition-hardcover-book&class=scaled&v=1454961878)