DG>Spare set in case of a break, or second line.
Used for but not meant for?
  >I think in the days of party
  >telephones they were connected, and had a different function.
Which was.
DG>If you don't have any audible hum or noise, it's probably ok.  The
  >crosstalk problem is if you're using yellow/black for a different
  >line, and conversation from one line "bleeds over" onto the other.
No, the line seems to be pretty clean.
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