First, what type of system?
Are you talking about Verified Account Codes for changing Class of Service and Class of Restriction for the set on a per call basis? IE, the set is normally restriced from making particular types of calls, but by entering a verified account code, you can override those restrictions.
Or are these account codes provided by your Long Distance provider to either prevent LD abuse or provide a monthly billing breakdown of LD? These type of account codes are dialed by the user AFTER the call gets out of the phone system and really have nothing to do with the phone system.
If it is the first, then no, there is no way to force a specific extension to use a specific verified account code. Unless of course, you only build one verified accound code. But as M1tel has said, anyone on the system can use that verified account code for any restricted set.
If you are needing accound codes for your LD provider, then yes, you can do it. It would be pretty complicated, especially if you don't understand ARS in the Mitel. But you would basically build an ARS route specific to the user by way of COR and COR groups and have that route insert the specific account code per LD call from that set. If you really wanted, I suppose you could build individual routes for more than one set, but depending on your system type, there is a limit of how many COR and COR groups you can employ.
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What if I don't want to put a signature on my posts?