Jack - the first thing i would try is to change your dialing plan from 9 to 9any - i have seen this fix the problem many times but not always
- i have seen this problem on many sytems from 4.1 to 6.1 s/w
- Nortel is aware of the problem and do not have a solution and the only sure fix i know of is to change them to pri's

Another thing you can try is using external csu's - i know some vendors who do not seem to have this problem when they have integrated T1's (18 channels of voice and 6 channels of data) with an external csu but i have yet to prove this.

I am also awaiting a reply from DrNortel who writes a column in the mart magizine.

You are not alone with this trouble -