If you have a lets say a router and a PBX built in like the ones shortel and allworx sell. Do you need landlines. What is it with VOIP when is it when you dont need to have land lines to call out? Can your internet connection turn into your line to you dont need services like from att, etc?
I want to know the technical and fundamental aspect please
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The shorter answer is Yes, you can do away with landlines IF you have enough bandwidth for all your users. Typically you will need 128Kbps (up/downstream) per voice call. Most SIP connections (SIP (http://en.wikipedia.org/wiki/Session_Initiation_Protocol) is the VOIP standard)
Look into the Asterisk open source PBX system. http://en.wikipedia.org/wiki/Asterisk_PBX
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