Panasonic KX-NS0180 2-Port Analog Trunk - 2-Port SLT Card SLC2 - LCOT22 Port Analog Trunk/2 Port SLT Card (SLC2/LCOT2)2 analog trunk ports with Caller ID (FSK/FSK with Call Waiting, Caller ID) with 1 power failure transfer port2 extension ports with Caller ID (FSK) for single line telephon..