Hi 아난, If you're facing call forwarding issues where calls drop immediately, it may be related to configuration or provider issues. To address this: 1. Verify Forward Initiation: - Check if the call was marked as

assistant-forwarded-call

. If so, forwarding was initiated successfully by Vapi. 2. Review Configuration: - Check if

phone-call-control

is mentioned in

serverMessages

in your assistant configuration. If present, remove it unless using custom call control. - Ensure

phoneCallProviderBypassEnabled

is set to

false

for standard Vapi forwarding. 3. Check Telephony Provider Logs: - Use

phoneCallProviderId

from the Vapi call object to search in your provider's dashboard (e.g., Twilio, Vonage, Telnyx) for transfer errors. 4. Destination Verification: - Ensure the destination number includes the country code and is reachable. - Double-check if the destination has any call blocking enabled. For more detailed troubleshooting, you can refer to [Debug call forwarding drops](https://docs.vapi.ai/phone-calling/transfer-calls/debug-forwarding-drops) in the documentation.