Telerivet supports connecting third-party VoIP providers or devices to send and receive voice calls in Christmas Island. 

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Other Options

The Telerivet Gateway app supports receiving notifications of incoming calls in Christmas Island, 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 Christmas Island, although incoming calls cannot be received via this method.