37011: WhatsApp Voice: Dialing out to PSTN or Teams is not allowed

From a WhatsApp inbound call, the customer cannot place an outbound call to PSTN or Teams numbers.

Dialing out to PSTN or Teams numbers from an inbound WhatsApp call is not allowed by Meta's policy.

Do not attempt to dial out to PSTN or Teams numbers from a WhatsApp inbound call.

• WhatsApp Business Calling: Current restrictions to user-initiated calling