Internet Communications Using SIP : Delivering VoIP and Multimedia Services With Session Initiation Protocol {2Nd Ed.}

[15] Nimcat/Avaya Networks P2P Enterprise nimX Phone System. http://

nimcatnetworks.com.

[16] PEERIO Server-free Telephony System. http://peerio.com.

[17] “Use Cases for Peer-to-Peer SIP” by D. A. Bryan et al. Internet Draft, IETF

and William and Mary University, Williamsburg, VA, November 2005.

[18] “ZRTP: Extensions to RTP for Diffie-Hellman Key Agreement for SRTP”

by P. Zimmermann and A. Johnston. IETF Internet Draft, work in progress,

February 2006.

[19] “SIP Thor: Scalable SIP solutions for millions of subscribers.” AG Projects,

2006. http://ag-projects.com.
      [20] “An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol” by S.
      Baset and H. Schulzrinne. Columbia University, September 2004.
      [21] “SIP Beyond VoIP” by H. Sinnreich, A. Johnston and R. Sparks. VON
      Publishing, 2005.

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