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Eric, the problem with the power feed may be that you have the wrong polarity, plugpacks come either cente positive or centre negative, you need the correct polarity, suck it and see isn't really the best way to find out. Are you sure that 19v is the correct voltage for the plugpack?
The company I work for is an authorised Avaya dealer, not my favourite system, we rarely touch them. FYI Avaya is Nortel, same company, I may be able to get you the necessary info to get it working. Can you let me know the model of the phone system.
If your It guy doesn't have the Avaya system management tool and some experience with programming that system, then your chances of getting it going are probably nil.
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