Sinch.

Swedish cloud communications platform for messaging, voice and video APIs

Facts

Asterisk
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↗
CM.com
Dutch conversational commerce and communication platform with SMS, voice and payments
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Infobip
Croatian omnichannel communication platform with SMS, voice and chat APIs
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Kamailio
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↗
Bird (MessageBird)
Dutch CPaaS platform for SMS, voice, email and chat communication APIs
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NFON
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pascom
German business phone system with unified communications and team messaging
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↗
sipgate
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↗