Ok, it has always been my understanding that to support ISDN my T1 lines would need to be BRI or PRI and not CT1. Another ISP in the area thinks it will be supporting ISDN over CT1 on its Lucent(?) equipment. Currently, my CT1 is set for AMI/SF. Is it possible to support ISDN on the TC1000 using CT1? I cannot currently get anything other than AMI on the CT1 at this time. I just reread that paragraph and the number of acronyms would choke a horse. Wayne Barber Coastal Telco Services - 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.