### Answer
The "Phone number already exists" error when adding a Zadarma number via SIP trunk typically means the number has been associated with another workspace and needs to be released. [(1) ](
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Unfortunately, I cannot unblock phone numbers directly—this requires action from the Retell AI team.
What you should do:
1.
Provide your org ID and proof of ownership for the phone numbers (such as a screenshot from your Zadarma account showing you own them) .
2.
Reach out to Retell AI support directly:
- Visit [Contact Sales](
)
- Visit [
)
Since you've already emailed and haven't received a response, you may want to try reaching out again with your org ID and proof of ownership clearly included, or try a different support channel.