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Old 18th May 2019, 8:02 am   #3
AN53808
Diode
 
Join Date: Jun 2018
Location: Chippenham, Wiltshire, UK.
Posts: 4
Default Re: GPO/BT Call Progress Tones?

I think the alternative engaged tone you're referring to is "equipment busy tone" as I understand it. I believe this is when the call could not be routed/connected to the called party due to insufficient capacity - probably a shortage of trunk lines or similar.
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