On Sun, 09 Sep 2012 12:03:16 -0400, Metspitzer
wrote:


For the second line, I have a base block next to the equipment. I
could just take a 6' phone cord and jump between the second line and
the new phone jack line 2. This would make the entire house then be
on the second phone line back feed through the room jack.

Would this work?


That is the common practice - back feed from the MTA to the other
phones.

Just be sure that you disconnect the other phone company feed at the
NID.