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1. Sauter, M. (2006) Communication Systems for the Mobile Information Society, John Wiley and Sons, Ltd, Chichester.
2. Rosenberg, J. and Schulzrinne, H. (2002) SIP: Session Initiation Protocol, RFC 3261. The Internet Society.
3. Berners-Lee, T. (2005) Uniform Resource Identifier (URI): generic syntax, RFC 3986. The Internet Society.
4. Handley, M., Jacobsen, V. and Perkins, C. (2006) SDP: Session Description Protocol, RFC 4566. The Internet Society, July.
5. Schulzrinne, H., Casner, S., Frederic, R. and Jacobsen, V. (2003) RTP: a transport protocol for real-time applications, RFC 3550. The Internet Society, July.
6. Schulzrinne, H. and Casner, S. (2003) RTP profile for audio and video conferences with minimal control. The Internet Society.