DTMF Tool Successfully Called but IVR Option Is Not Triggered During Outbound Call

Our assistant is configured with the DTMF tool to send keypad inputs (e.g., “1) during outbound calls for navigating IVR menus. The assistant is using the GPT-4o model, and the tool is linked correctly via toolIds.

During a live outbound call (not a sandbox or preview session), when the IVR prompts with “Press 1 to continue, the assistant logs show that it successfully calls the DTMF tool with {"digits": 1} and the result is "Success.". However, the IVR does not react — it behaves as if no key was pressed.
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