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Verticall 
Definity
Definity Circuit Packs
Definity TN464D
Avaya Definity TN464D circuit packs are available through Verticall Communications. Avaya Definity TN464D circuit packs provide twenty four channels for DS1, T1, and ISDN interface. The TN464D supports DS1 rate and E1 Rate. For more information regarding Avaya Definity TN464D circuit packs, contact us by calling 866.459.2255.