Panasonic KX-DT590-W Expansion ModuleExpansion Module Direct Station Selection (DSS) Works with Panasonic KX DT543 & KX DT546 phones 48 Extensions Per Expansion Module Busy Station Signalling Maximum of 4 DSS console per phone. The Panasonic KX DT590 B is a DSS that works with Panasonic KX DT543 and KX DT546 phones. Maximum of 4 DSS console per phone.
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