1. Go to the TMS URL: https://tms.euphoria.co.za/ 
  2. Choose the correct account
  3. Click on the PBX Manager menu item.
  4. Click on the PBX Settings sub-menu item.
  5. In the very first dropdown box, select the number you would like as your Default External Caller ID.
  6. Uncheck the box that says Allow Personal Caller ID.
  7. Now click the Apply button. This change will take effect immediately.