Have a weird problem that started yesterday. We have three VG248's running version 1.2(1) with a mix of fax and modems attached. These are part of our CM 4.1(3)sr6 installation, as is a 2811 router with two PRI's attached, one for local telco the other to our LD carrier. Starting yesterday, we started experiencing issues with calls made from VG248 attached devices to toll-free numbers (866, 888). Calls to local and non toll-free numbers work fine. This problem not localized to one VG248; we've seen it on two of them so far. Just to add to the confusion, some of the ports are still able to reach the toll-free numbers while others are getting the classic "Your call cannot be completed as dialed" message. ISDN Q931 Debugs on the gateway routers look almost identical between the successful and unsuccessful calls. Only difference is a "Q931: TX -> CONNECT_ACK" seen on the successful connection. Calls from 7940's & 7960's to the toll-free numbers work fine every time. We've swapped modems, tested with analog handsets and used different DN's on the analog ports without making a difference. These VG248's have been in service over 2 years without a hitch. I've asked our telco folks to talk with the carrier, but am wondering if anyone else has seen such weirdness before.