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8x8 Support

Auto Attendant: Fast Busy on Transfer to External Number


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.

Applies To

  • Admin Console
  • Auto Attendant
  • Transfer


Re-save settings in Configuration Manager, making sure a Main Line Number has been entered and selected.

  1. Log in to Admin Console
  2. Click Sites.
  3. Next to the desired site, click Edit (pencil icon).
  4. Scroll to Voice Service Settings and select the Main Line Number, if not yet selected.
  5. 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.

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