In the Vonage dashboard, create a SIP trunk and configure termination.
Add origination rules pointing at Retell's SIP endpoint.
Create credentials for outbound authentication.
In Retell, go to Phone Numbers → + → Connect via SIP trunking.
Enter the number, termination URI, credentials and transport.
Assign an agent and test.
Inbound support line on Vonage → Retell agent answers and resolves routine questions → warm transfer to a human when it can't













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