I'm assuming you are not speaking of the actual handset mobility. If so, records are likely to appear the same as the rest of the calls from the location and will be hard to identify via the CDR- phone will likely register w/ new IP and use CSS, partitions, gateways, etc associated with that second location.
 
If you are speaking of user/extension mobility via login, you may try keying on the loginID fields.
 
If you are referring to call-flow mobility features like 'Follow-Me', etc, you may be able to use some redirect, onbehalf codes, etc as referenced here:
 
http://www.ciscosystems.net/en/US/docs/voice_ip_comm/cucm/service/8_0_1/cdrdef/cdradminguide.pdf

Ah ok. Well other than location tracking I can't see it having much impact regarding content change in that regard. But then again, no idea what the software may be doing with the data. Do you mind if I ask what you are using? (Not lucky enough for it to be free by any chance would it?) lol

Good idea, and best of luck with IVT :-)