The TVS100 seems to b a 2 port, it has just one card with two jacks. I wired them to jacks 15 and 16 on T-R and D1-D2 USOC style. I went to system programming and set master 15 and 16 for the voice message ports. WHen I dial intercom 165 the display reads not in use, not configured or something like that, I forgot the exact message. What did I do wrong?