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Twilio
Telephony
Cloud communications APIs for voice and SMS
Amazon Connect
Telephony
AWS cloud contact center
Asterisk
Telephony
Open-source PBX and telephony toolkit
Bandwidth
Telephony
Voice APIs on a US carrier network
FreeSWITCH
Telephony
Open-source telephony platform and media server
Plivo
Telephony
Voice and SMS APIs with SIP trunking