Symptom
When using a Call Queue to dial out to an external line, you receive a busy signal/call drop.
Applies to
Admin Console
Call Queues
Resolution
For a Call Queue 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 Call Queue.
Another method is to forward calls from the Call Queue to a user or Auto Attendant and then configure that user/Auto Attendant’s call forwarding rules to dial out to the external number.
The above approaches rely on a number being associated with either the Call Queue, with a user or extension that handles the external forwarding.
Note:
Essentially, when placing a call to the Call Queue to eventually dial out to the external line from the Call Queue 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 Call Queue