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Messagebird Voice Calling API - Followers

The MessageBird Voice Calling service offers VoIP features for handling phone calls from/to a voice capable number that is purchased via MessageBird. The API uses HTTP verbs and a RESTful endpoint structure with an access key that is used as the API Authorization. Request and response payloads are formatted as JSON using UTF-8 encoding and URL encoded values. MessageBird is a software telecom service for SMS, Chat and Voice API's that connect you to 7 billion phones globally.