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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
Mitel - Business Communications and Collaboration
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
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
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.