According to the compatibility matrix the T1-186 code version 3.5 is not compatible with TCS 3.6 which includes the Arc code 4.2.32-1. I just noticed this is the configuration I am running with no apparent ill effects. This may go back to the discussion of what version of code to run on the Arc, but is anyone else running this configuration? Does it seem appear stable to you as well? What benefit is there to replacing the old T1 card with the newer PRI/T1 card? I'n not really keen on dumping the quads yet because they are working, and at times they seem to be more compatible with the worthless modems of the world than my DSP's. Mark Thornton San Marcos Internet, Inc. 512-393-5300 - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.