- Expansion 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.