I think I know the answer, but want to be sure. My home STSe SLT's no longer ring, I'm not positive where the ring voltage comes from but assume from my 4 port SLIB card, but would like to verify that. I've changed slots, no help and the built in SLT ports work fine, that's why I'm fairly confident I'm correct in assuming the ring voltage comes from the 4 port card. Thanks


Retired phone dude