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Request a Quote TN753 Avaya TN753 DID Trunk Interface The TN753 DID trunk circuit pack has eight ports that used for immediate- or wink-start direct inward dialing (DID) trunks. Each port has tip and ring signal leads. The TN753 circuit pack supports A- and ยต-Law companding with vintage 17 or greater. This unit is also known as TN753B. Avaya TN753 DID Trunk Interface