The Panasonic KXTDA0170X 8 digital hybrid extension card is required to let the legacy Panasonic KXT7700 series keyphones work on the Panasonic KX-TDA100, KX-TDA200 & KX-TDA600 as well as the Panasonic KX-TDE100 & KX-TDE200 telephone systems.
Panasonic KXTDA0170X Information
Manufacturer Part #
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