What setting exactly is the endpoint referring to is the question?? Its crazy how vague Zoom support is on everything.
Could be outbound caller id, could be external calling as a whole, could be outbound rules, could be outbound blocks, or it could even be international calling? Can you please actually detail what that endpoint refers to in the Web Panel?
Based on the API description, this endpoint refers to the outbound calling policy exception rule for COUNTRY REGION. It allows you to override an account-level enforced outbound calling policy rules. This means that if there are any exceptions for making calls in a particular region users/agents are not permitted due to the account’s policy rules, you can use this rule to allow those outbound calls to take place.