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Old 18th May 2019, 8:41 am   #4
Herald1360
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Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 13,709
Default Re: GPO/BT Call Progress Tones?

I believe the "uneven" sounding engaged tone is "equipment busy" rather than "called party engaged".

I've heard "The number you have called, is unavailable" announcements.

I've also heard on occasion some pretty "rough" approximations to the various tones.
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