What are some alternatives?
NextPlane - NextPlane offers cloud-based, scalable unified communications federation service for the enterprise.
Voxer - Turn your phone into a Walkie Talkie. Don't waste time on phone calls and voicemails.
Investis - Investis helps companies to use digital channels to increase revenue, enhance employee engagement and influence corporate audiences.
SightCall - SightCall offers comprehensive real-time video APIs and Mobile SDKs that makes it simple to embed...
Unitely - Unitely provides visualization of communication flow enabling organizations to take corrective actions and create more efficient teams.
SnapComms - SnapComms provides internal communication solutions for organizations.