Internet Telephony/H323/SIP (Session Initiation Protocol) Resources

• VoIP Troubleshooter (VoIP Troubleshooter is a free online resource for network managers, providing background information and online diagnostic tools. )
• SIP (Session Initiation Protocol) Forum
• The SIP Center
• Voice over IP Calculator (Provides free online resources for engineers involved in the deployment of Voice over IP and other network convergence technologies. Our sites includes free online bandwidth calculators, technical papers, a forum and a VoIP directory. )
• White paper from Ganymede Software, Inc. covering Voice over IP. Requires Adobe Acrobat
• VON (Voice Over the Net)
• Virtual Voice Home Page

Internet Telephony Providers 

• VOXBone (Provides international virtual numbers and VoIP origination services worldwide.)
• Advanced VoIP Billing System
• ICC Public Communication Systems
• Vonage Digital Voice
• 1Internet Phone
• ISPhone (Voice over Internet Protocol (VoIP) services for ISPs, ITSPs, CLECs, CASP and other service providers and businesses from ISPhone)
• SipTelecom  (Free iPN Internet Phone Number allow people to call each other by a click on a link.)
• Cosmobridge
• Nuera Communications, Inc.
• CosmoCom, Inc.
• CallWare Technologies, Inc.
• Intervoice, Inc.
• ADIR VOIP Technologies
• EasyLink
• First Visual Communications 

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