Does the UC300 support editing of the external dial plan - i've got a possible setup where the FXO lines are part of a Centrex system and require you to dial 2x 9's for an outside line (e.g. 9901234123456)?
Can you also map each FXO port separately to a different use (e.g. FXO1 - go to AA, FXO2 - go to ext 221, FXO3 - go to Fax machine)??
Currently centrex line dial plan is un-supported on the UC320. You could try putting all the lines in Key System mode and map all the lines to buttons. However the inter-digit timers are going to be a little out of whack. When you press 9, the UC320 is really thinking that you are pressing a number with area code started with 9 eg. 919-XXX-XXXX, so you have to punch in your numbers real quick.
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