Thank you for the reply. I only rarely find references to what COS is applied in the documentation (for example, "if allowed by the COS of the calling station"), and even when it seems to say, it's often still vague.
As an example, for timers or forwarding restrictions or options, when you forward an inbound call through a public trunk, does the COS of the inbound trunk, the station, or the outbound trunk apply? Where in the documentation is that specified?
When planning a setup and determining which COSes to apply to what stations and trunks to meet the feature and restriction requests of the customer, how do experienced Mitel system managers confirm everything is applied as intended? Functions testing each possible feature on each station/trunk, with every possible scenario (access code dialed, ACD user logged in) is not practicable.
I think of this in relation to Microsoft Group Policy, which also multiple polices that can apply to one user or computer. It can be confusing with hierarchies and overrides, but there is a known, documented method by which a policy overrides others on Windows Server (or doesn't), and you can also run tools to have it calculate and show you which settings are applied to a given user or computer. Is there not anything like that for the Mitel 3300?