Thread: GPO/BT Call Progress Tones?
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Old 30th May 2019, 9:48 pm   #21
McMurdo
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Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
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Default Re: GPO/BT Call Progress Tones?
I've had several 'exchange equipment busy' tones recently dialled from landlines, either to a mobile or a BT VOIP line.
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