Which debug command is to used to monitor ISDN spid error? In Cisco CIT book, it said using debug isdn q931, but in Cisco Network Design (CCIE Books), it said using debug isdn q921. I want to know in a CIT exam, which is right? ___________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]