Telerivet supports connecting third-party VoIP providers or devices to send and receive voice calls in Heard and McDonald Is..
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Other Options
The Telerivet Gateway app supports receiving notifications of incoming calls in Heard and McDonald Is., although IVR is not supported for calls received via this method.
Telerivet can also send outgoing voice calls using Twilio with using a verified caller ID in Heard and McDonald Is., although incoming calls cannot be received via this method.