Found a potential issue in MiVB 7.2 SP1 PR1, I've managed to replicate it at 2 completely different customers, looking for someone else to confirm. If I have a speed call to an external number, and the line for that speed call is set to override toll control, dialing the speed call from a restricted SIP set is still blocked by COR. Works fine for MiNET sets. I've got a ticket open with Mitel tech support, still waiting for them to confirm it.
So, for example, I have SIP set on x2599, and a 5330e on x2598, both with a COR of 1, which is restricted to only internal and 911. I program a speed call (say 2999) to an external number (say 613-592-2122), set "overrides toll control" for "Yes". If I dial 2999 from the 5330e, the call goes out. If I call it from the SIP station, I get reorder tone, and if I look at the SIP messaging, I get a 401 - Forbidden.