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

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Other Options

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