### Answer The "Call country not supported" error is related to geographic restrictions on your phone number. For Retell-purchased numbers: Retell supports calling to 15 countries. [(1) ]() Singapore may not be on that list for your number. Check your Allowed Outbound Countries setting: You can restrict which countries your phone numbers can call. [(2) ]() If you have an

allowed_outbound_country_list

configured on your phone number that doesn't include Singapore ("SG") , outbound calls to Singapore will be blocked. To fix this: 1. Navigate to Phone Numbers in your Retell dashboard 2. Click on the phone number you want to configure 3. Under Allowed Outbound Countries, add Singapore ("SG") to the list, or set it to allow all countries You can also configure this via the Update Phone Number API: [(3) ]()

bash
curl -X PATCH "<https://api.retellai.com/update-phone-number/+14155551234%22> \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "allowed_outbound_country_list": ["US", "CA", "SG"]
  }'

To remove all restrictions, set the list to

null

. [(2) ]() If using imported numbers: International calling depends on your telephony provider's settings. [(1) ]()

​ To learn more, see the sources I considered: [[1] Outbound Calls (Make Calls)](https://docs.retellai.com/deploy/outbound-call) [[2] Fraud Protection](https://docs.retellai.com/reliability/fraud-protection) [[3] Update Phone Number](https://docs.retellai.com/api-references/update-phone-number) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.