When attempting to transfer to an external number from inside the Auto Attendant, you get an immediate busy signal, known as a "fast busy." Inbound calls can still be received and are not affected.
Virtual Office Configuration Manager
Re-save settings in Configuration Manager, making sure a Main Line Number has been entered and selected.
- Log in to Virtual Office Configuration Manager.
- Click Sites.
- Next to the desired site, click More Options (three dots).
- Select Edit.
- Scroll to Voice Service Settings and select a Main Line Number, if not yet selected. If a Main Line Number is already selected, go to Step 6.
- Click Save.
The source of this issue is that the Main Number for the account has not been properly set. This can stem from various issues: no company number has been selected; the previous company number was a line item that was cancelled; or the DID was changed or phone numbers on the account were moved around.