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Twilio - Brings voice and messaging to your web and mobile applications.
Telegram API - We offer two kinds of APIs for developers. The Bot API allows you to easily create programs that use Telegram messages for…
Bandwidth - Bandwidth offers SIP trunking, Emergency communications, and Voice & Messaging APIs.
TDLib - Build your own Telegram
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Google Duo - Google's answer to Facetime, high-quality video calling on iOS and Android.