Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
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
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.
Eir SIP Voice - eir SIP Voice is revolutionizing the core communications tool of business that carries both calls and data over just one connection.
CounterPath Softphone Client Suite - CounterPath enables users to make VoIP audio and video calls, send instant messages and manage their presence in an easy-to-use software.