Product Description:

One per system required for connection of DTMF standard telephones. Direct Inward System Access lines, and voice mail devices. Also provides-busy tone detection for Auto Busy Redial The K4RCU3 mounts in the base KSU.

Compatible with DK16, DK16e, DK40, DK40i.

Manufacturer's part#, K4RCU3A
Other variations, K4RCU3, K4RCU

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