Hi Guys,

I was wondering if the ITT K403A Music on hold card is a plug & play card for the 501 KSU or do you need a separate card slot rack in order for it to work? I can't recall if this is the one if you plug it in a empty slot on the KSU and it blows up.

Also since the extra card racks so hard to find, what would option to get this card to work or just give up on MOH?

Thanks Brian