Add Phone Number

Set inbound_workflow_id to bind incoming calls on this number to a specific agent — IntraCord will register the inbound webhook with the provider and the response will include a provider_sync block reporting the result. Omit it to add the number for outbound use only.

The (provider, account_id, address) tuple must be globally unique across all IntraCord organizations, since inbound dispatch keys on it. Attempting to add a number that another organization already owns returns 409.