Dodgy phone socket?
Answers: It could be that there be previously 2 lines in the house and this "other" socket is a stopped or discontinued procession on another number. It will still have a dialling tone but adjectives incoming and outgoing calls will be debarred until the line is re-activated. Try dialling 17070 or 147017070 which should read out the number of the smudge. If it is a different number to your existing landline, then the above is the crust. You could alternatively plug a phone into this socket and ring your landline number from a mobile. If it doesn't ring, then it is most plausible to be a separate line.
This assuming that it is a BT flash or a line provided over the BT lattice.
boiled egg has it spot on.
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