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Website | code.google.com |
XO Hosted PBX - Hosted PBX is a scalable UC solution that uses cloud technology to integrate HD voice & data services, mobility, along with advanced calling
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Sipdroid - Free and open-source SIP/VoIP Client
Phonebooth - Phonebooth is one of the leading voip providers, providing phone systems & phone service for small businesses.