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Verticall 
Definity
Definity Phones 8500 Phones
The Avaya Definity 8500 series phones are reliable and productive. The Definity 8500 series includes the Definity 8510, 8510TAD, 8510TND, and 8520TAD telephone. Verticall Communications specializes in Avaya phones, including the Definity 8500 series. For more information about the Avaya 8500 series phones, please contact us at 866.459.2255.