Quote:
Originally Posted by merlinmaxwell
It looks to be the same frequency as your dial tone, is it. Does it go away on a silent line?
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No, it sounds a similar frequency to 50Hz mains hum, whereas the PABX uses the modern (350+440?) dial tone.
It certainly doesn't go away once the dial tone times out (after 20 seconds), though the dial tone is pretty much inaudible anyway over the buzz, so I can't hear when it has stopped.