If I understand what Honey is asking is how to know the place (CellID) where one subscriber is related to?
With MGTRP command, it just converts MSISDN to IMSI.
I think for the related Cell ID you can do like this:
one MSC:
CTRAI:msisdn=…;
test system;
copy the value after MTV- on printout,
PRINT VAR MTV(space)(paste):327;
(32 for CID, 328 for LAC)
Convert to decimal the hexa value at the end (ex: 4EDC), this is your CID.
Hope it can help.
NJ