In article ,
polygonum wrote:
At the moment, I am hypothesising that the issue is on the line rather
than an actual phone.

What DIY testing is possible? Are there any diagnostic numbers available?

I'd first check the DC volts across the line. During the day when things
are fine - then when the fault is present.

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*WHERE DO FOREST RANGERS GO TO "GET AWAY FROM IT ALL?"

Dave Plowman London SW
To e-mail, change noise into sound.