Mitel - Business Communications and Collaboration
Callmama - Get cheap international calling, international virtual number, Call Mama Gives an added advantage to send message and make calls to non-user of Callmama App.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
CallHippo - Easy to use Phone System with World-Class Support
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
KrispCall - Virtual cloud phone system for business