There is no standards-based method to deliver caller ID on an E&M Tie line. There is a provision for *DNIS*ANI* (or maybe it's *ANI*DNIS* - it's been many years since I've last used this), but I don't think IPO will support it. Is it CenturyLink's CO at the other end of the Tie line delivering regular calls? If so, easiest is to convert to PRI.
The last E&M TIE Line in IPO I did was on a 406 7 years ago and IPO did not support Caller ID at that time. I doubt it has changed since then but can't be sure.
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