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Verticall 
Definity
Definity Circuit Packs
Definity TN2400
Avaya Definity TN2400 circuit packs are available through Verticall Communications. Avaya Definity TN2400 circuit packs replace NN778 circuit packs. For more information regarding Avaya Definity TN2400 circuit packs, contact us by calling 866.459.2255.