Dialfire - Cloud Calling at Jet Speed
Twilio - Brings voice and messaging to your web and mobile applications.
KOOKOO - All in one solution for calls, IVR, live chat, customer management & more.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
BulkSMS - SMS messaging service provider offering two-way SMS communication services.