Matthew, Is there any particular card you would recommend for use with libss7? We would just be using it for a pair of A-links. Oddly, we have a pair of links that are one 56k and one T1. We've used a channel bank and other equipment to get the 56k into the 1st channel on a T1 to use with T1 cards. Any suggestions? Any problem with using a 56k on channel 1 of a T1? Thanks, Michael