Symptom
When using an Auto Attendant to dial out to an external line, you receive a busy signal/call drop.
Applies to
Admin Console
Auto Attendants
Resolution
For an Auto Attendant to forward calls out to an external number, the phone number receiving the inbound call must be assigned to a user or service first. An unassigned number will not support forwarding to an off‑net (external) destination. You need to involve a user/number in some way:
One method would be to assign a number to the Auto Attendant.
The second method is to assign the Auto Attendant’s 8x8 number to a user account, then configure that user’s call forwarding to the external number. Calls to the AA number are then forwarded out via that user’s forwarding rules.
Another method is to forward calls from the Auto Attendant to a user or ring group, and then configure that user/ring groups call forwarding rules to dial out to the external number.
The above approaches rely on a number being associated with either the Auto Attendant, with a user or extension that handles the external forwarding.
Note:
Essentially, when placing a call to the Auto Attendant to forward out to the external line from the Auto Attendant that is not assigned to a number, there is no phone number to associate with the call, and the carrier rejects it with a 403 FORBIDDEN.
Causes
Concurrent external calls has been reached
No user/service/number is assigned to the Auto Attendant