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Twilio - Brings voice and messaging to your web and mobile applications.
BroadSoft UC-One - UC-One is a suite of cloud communications offering business phone services, messaging, audio and video conferencing, and more.
Plivo - Plivo simplifies your customer engagement.
NextCall - 1 click to join upcoming Zoom calls (and other video calls)
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
CamCard - CamCard reads business cards and save instantly to phone Contacts.