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First connect your Retell agent.

Test through a Retell phone number

Use this option when you need to test the agent through its deployed Retell phone route. Set RETELL_PHONE_NUMBER to the E.164 number returned for the selected agent by egma agent connection options, then add the connection:
This places a real phone call when you start a run. Phone simulations use your deployed phone route and its normal backend. They do not support test mock tools or retell_dynamic_variables. Use a web-call connection when you need those controls. For self-hosted Egma, add the required phone-provider secrets to the platform .env file before starting a phone run.