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Old 10th Jun 2021, 5:44 pm   #4
Dave Moll
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Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 5,455
Default Re: "Duck" telephone

Quote:
Originally Posted by merlinmaxwell View Post
It looks to be the same frequency as your dial tone, is it. Does it go away on a silent line?
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.
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Last edited by Dave Moll; 10th Jun 2021 at 5:52 pm.
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