Abbreviated dial works by having the user dial the code (42, for instance) and then lifting the handset. Or, they can lift the handset, press the AbbrDial softkey (if it is in the template), and then dial the code.
As for your specific question, I'm not sure I understand what you are asking. So I'd say this: Configure it on a phone and try it out. You'll have to train your users anyway so it's worth getting it down.
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