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Trunk Queuing - directs the communications server to help you
complete your call when you are trying to reach an outside number
and all trunks (outside lines) in your company's system are busy.
Trunk Callback Queuing lets you hang up and have the
communications server call you back when a trunk becomes free.
After you answer, the communications server dials the number.
Trunk Standby Queuing lets you stay on the line until a trunk
becomes free. The communications server then dials the number.
(See "Trunk Queuing" on page 3–39.)
2-10 ROLMphone 120/240/400 Series User Guide