We have an intermittent fault on our telephone line- but otherwise it works well.
If we do a "quiet line test " when the line is "having problems" we can hear the background noises you would expect to hear if someone has left a phone "off the hook" i.e. conversations, footsteps, fax machine noises, one half of telephone conversations etc. But no message to "please hang up etc." ever occurs.
sounds like a crossed line you need to report a fault to 151
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