VoIP.ms - VoIP.ms is a VoIP origination and termination tool.
Mitel - Business Communications and Collaboration
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
NUACOM - All-in-One VoIP Business Phone System with 100+ features and integrations that will boost your sales and improve customer services. Discover the power of VoIP for seamless and cost-effective communication & Boost productivity and drive revenue.
Phonebooth - Phonebooth is one of the leading voip providers, providing phone systems & phone service for small businesses.
Loop Communications - Loop Communications provides hosted VoIP business phone systems to small businesses and mid-sized companies.