Google Voice
Google Voice gives you one number for all your phones, voicemail organized in an email format, free US long distance calls, low rates on international calls, and many free calling features, including transcripts, call blocking, call...
RingCentral delivers high quality, reliability and value that's expected by enterprise businesses through RingCentral Office, an all-inclusive cloud phone system...
RingCentral delivers high quality, reliability and value that's expected by enterprise businesses through RingCentral Office, an allinclusive cloud phone system containing HD video meetings, unified voice, fax, text, and audio conferencing.
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Google Voice gives you one number for all your phones, voicemail organized in an email format, free US long distance calls, low rates on international calls, and many free calling features, including transcripts, call blocking, call...
Free Android iPhone Web
MIGHTYCALL is the virtual phone system that allows you the freedom and ability to manage your business from anywhere.
Commercial
Yate is a softswitch (concept of separating the network hardware from network software). It supports VoIP protocols: H.323, SIP, IAX1, IAX2, RTP. For the plain old telephony systems (PSTN) it supports ISDN BRI and PRI.
Free Open Source Linux
Phonebooth is a web-based phone system that routes your calls to any landline or mobile phone number you choose. Users receive a free local phone number to give out to...
Commercial Web
Truly Wireless is the most advanced, feature packed and reliable mobile business phone system available.
Commercial Mac OS X Windows Android iPhone Web
Advanced IP PBX and a Unified Communications platform based on Asterisk® - the worlds most popular open source PBX engine.
Commercial Linux
Thirdlane® Multi Tenant PBX Platform is a reliable, cost-effective Multi Tenant IP PBX and Unified Communications software platform with support for voice...
Commercial Linux