| Type | Business Phone |
|---|---|
| MPN | TN556B |
| Brand | Avaya |
Check the listing for details. Refurbished Avaya Definity TN556B V3 ISDN-BRI 4-Wire Interface. Condition: Seller refurbished. Listed at 49.00 USD. Each port has TXT, TXR, PXT and PXR signal leads and up to 8 ports can be used for adjunct switch application interface (ASAI) links. Compatible with Definity R7 or later models.
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