### Answer
It seems you are encountering an error with your outbound calls using Vonage after successfully importing your number. This specific error message, "Recipient does not exist in the specified domain," typically indicates an issue with the recipient's number format or the configuration in the Vonage system.
Here are a few steps you can take to troubleshoot and resolve this issue:
1.
Verify the Phone Number Format: Ensure that the phone number format you are using for the outbound calls is correct and supported by Vonage. This includes checking for correct country codes and number formatting.
2.
Check Number Registration: Confirm that the number you are trying to call is registered and active within Vonage's network or is accessible through their service.
3.
Review API Usage: Double-check the API call you are making for any possible errors in parameters or syntax. Ensure that all required fields are correctly filled. You might want to refer to the official documentation for creating phone calls to verify that your API usage aligns with the expected parameters [(1)](
) .
4.
Consult Vonage Support: Since the error message relates to a specific domain issue within Vonage, reaching out to Vonage support might provide more direct assistance and clarification on why the recipient number is not recognized.
For further reading on handling outbound calls and managing phone numbers with Vonage on Vapi, you can check out the relevant documentation sections on creating phone callsand importing phone numbers [(2)](
) .