I guess I never tried it until today, but:

"Does anyone know if the UX5000 forced trunk disconnect code even works on the SV8100?" On the UX5000, I used to be able to use #9xx*3 (where xx is co line number) to drop a locked line or force a call to drop. I suspect my error today is that I tried this on a PRI channel and not a copper CO line. Maybe this only works on analog lines. I don't have access to a 8100 or 9100 with analog trunks to test at the moment. Not a big deal, just asking...

Yes it does work but you need to define it in the numbering plan
I think it only works on analog lines (have only ever had to use it on analog lines)
it also needs Class of service Defined

Thank you for the reply!