使用RingCentral发送传真时出现[OutboundFaxes]权限错误

Let's get this sorted out. That CMN-408 error is straightforward—your target extension (****88004) doesn't have the mandatory OutboundFaxes permission needed to send faxes via the RingCentral API. Here's exactly what you need to do:

1. Log into the RingCentral Admin Portal
   Use an account admin or a user with permissions to modify extension settings to access your RingCentral admin dashboard.

2. Find the problematic extension
   Head to the Users section, then locate and select extension ****88004 from the list.

3. Enable the OutboundFaxes permission
   On the extension's page, go to the Permissions & Roles tab. Look for the Fax category (or search for "Outbound Faxes" to speed things up). Check the box next to Outbound Faxes and save your changes.

4. Wait a few minutes for changes to take effect
   RingCentral’s system needs a bit of time to propagate permission updates—give it 5-10 minutes before you retry.

5. Re-test your Postman call
   Go back to Postman and send your POST request to https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/****88004/fax again. The error should be gone if everything was set up correctly.

Quick note for service apps #

If you’re using a service application (not a user-specific app):

• Double-check that your app’s registered scopes include OutboundFaxes (you can confirm this in the RingCentral Developer Portal under your app’s settings).
• Ensure the extension you’re acting on has both the permission enabled in the admin portal and has consented to the app’s required scopes.

Content of the question originates from Stack Exchange, asked by Manadip