• AudioCodes
  voice over IP, voice over ATM and voice over Cable infrastructure
  VoIP Chips, VoIP Media Gateways, VoIP Media Servers, VoIP Session Border Controllers, VoIP Security Gateways & VoIP Value Added Applications developed by AudioCodes, leaders in the VoIP market for VoIP equipment and VoIP technology
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• Phil Windley
  Understanding VoIP
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• SIP Tutorial
  
  Internet Telephony
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• SIP: Session Initiation Protocol
  
  Session Initiation Protocol
  internet signaling sip telephony
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• SIPfoundry sipXmediaLib
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• The Jeff Pulver Blog
  
  Notes, comments and observations
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• VoIP Bookmarks
  SIP and RTP stacks, user agents and STUN server/client, an oveerview and little comparison
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• vovida.org
  in VoIP with voip
• Welcome to e164.org
  
  E164.org lists regular PSTN telephone numbers and maps them to VoIP (Voice over IP) addresses such as those provided by Free World Dialup, Broadband Phone Providers like Vonage, or even people who run their own Asterisk system
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