You know, you raise a good point. On 9100's the STANDARD IP and resource license will do 3rd party SIP. We do a significant number of 3rd party SIP devices. (remote paging, WIFI phones, whatever) I guess I was thinking about UX5000's and SV8100's. We would have installations at times, where the advanced IP license(s) (required to run the SIP devices) gets "taken" by an MLT and the then remaining license is a standard license that doesn't operate the 3rd party SIP device. I'd have to call NTAC they'd release the license assignment, I'd remove all the MLT's, bring up the SIP devices first. I'd use "DIM" a lot to identify which device had been assigned which license. That's one reason, but I'm not sure it matters on the 9100's any longer. hmmm