Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Loop Communications - Loop Communications provides hosted VoIP business phone systems to small businesses and mid-sized companies.
Mitel - Business Communications and Collaboration
ITG VoIP Plug & Play - A business telephone system ready to use in three easy steps: 1. Choose a call plan 2. Get all features 3. Choose a phone
Phonebooth - Phonebooth is one of the leading voip providers, providing phone systems & phone service for small businesses.
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.