AVOXI - AVOXI to deliver amazing call quality & an exceptional customer service experience.
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.
SIP3.IO TAPIR - VoIP troubleshooting, customer experience, and network performance management
CallHippo - Easy to use Phone System with World-Class Support
Global Call Forwarding - Global Call Forwarding offers local and international toll free numbers which can be forwarded to any phone, anywhere in the world.
KrispCall - Virtual cloud phone system for business