Who is the carrier for this client? I have lots of CC terminals, postage machines, faxes, etc. working off SL ports through a PRI. However, I never had issues until some clients started signing up for AT&T's BVOIP PRI. Now these devices won't work. You hear what appears to be the handshake, but it never connects. I usually route a DID to my internal modem card, but can't conect on these circuits.
