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For Avaya DEFINITY users, communicating with crystal clarity couldn't be easier. Just connect a SoundStation Premier 550D directly into a DEFINITY ECS digital wall jack. You don't need an analog port, analog adapter, or complicated connections to take advantage of natural, two-way conversations with Polycom's breakthrough Acoustic Clarity Technology.With sensitive high-performance speakers, SoundStation Premier 550D delivers crisp, clear sound that's twice as loud as Polycom's SoundStation. It's also twice as quiet. The SoundStation Premier 550D's automatic microphone switching technology means that only the microphone nearest the person talking is on, limiting extraneous noise from around the room. And, SoundStation Premier 550D allows you to add two additional microphones for greater room coverage.