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Re: Odd phone call...
All telephone lines will drop the call when either the caller or reciever puts their phone down - it can usually take a few of minutes depending on where the call came from (different telephone operators have different exchanges with different thresholds set although they all use the same signalling system).
You would need to wait for this to happen before trying 1471 and hope that the originating caller passed on their CLI.
As mentioned, unplugging the phone does not actually disconnect the line.
Only other possibility is that you have a faulty phone that won't release the line every time..... unlikely if all has been fine up till now.
HTH
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