• 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
  border communications controller gateway h.248 media mgcp over sbc security server session sip telephony unified voice voip
  with atm cable infrastructure voice voip
• Phil Windley
  Understanding VoIP
  with understanding voip
• SIP Tutorial
  
  Internet Telephony
  3gpp application initiation internet iptel messenger over protocol proxy server session simple sip sipping telephony voice voip
  with sip tutorial voip by 2 users
• SIP: Session Initiation Protocol
  
  Session Initiation Protocol
  internet signaling sip telephony
  with initiation protocol session sip voip by 2 users
• SIPfoundry sipXmediaLib
  with sipfoundry sipxmedialib voip
• 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
  agent asterisk client free gpl initation lgpl open protocol proxy rtc rtp ser session sip source stack stacks user vocal vovida
  with agents rtp server sip stacks stun user voip
• vovida.org
  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
  asterisk configuration dial dns e164 enum examples free help iax number over pots pstn sip verification verified voice voip
  with voip by 2 users

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