I went to the Polycom website in June and printed out the specifications for SoundStation Premier 500D/550D. It clearly states that it's compatible with any Definity voice port that supports the 6400, 7400 or 8400 series phones (except the CallMaster series).
If what Tele234 states is true, then the specifications paper that I have is very misleading, in that it really doesn't work with an Avaya Definity System.
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