I have a PRI 24ch. Was running 4.1.(17) upgradeds to 4.2.(20). Everything seems to be working well and the next day I get a trouble call. Can't dial out on all 24 trunks. I checked all against the original config prior 2 upgrade. Incoming calls working OK. Get a fast busy tone when dialing the complete 10digit string plus 9 code.
Working with ATT now. They say they see T1 and channels OK. Going to have someone trap some calls to assist.
Any ideas!!