VoIP / SIP
- Switching to VoIP
Theodor Wallingford, 2005, O'Reilly & Associates
- Understanding the Session Initiation Protocol
Alan B. Johnston, 2009, Artech House Publishers
- SIP - Demystified
Gonzalo Camarillo, 2001, McGraw-Hill Companies, Inc
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IMS
- The 3G IP Multimedia Subsystem (IMS)
Gonzalo Camarillo and Miguel A. Garcia-Martin, 2006, Wiley
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