Panasonic's KX-TDA50G-R Control unit is initially configured with 4-Super Hybrid eXtension Ports and 4-Loop Start CO ports (POTS - Plain Old Telephone Service w/1-LCOT card), Built in caller ID capability (on the 1st 4 lines), Power Supply, RS-232 port, USB port, MOH port, Paging port and an SD card. The system is eXpandable to 12 COs and 24 eXtension ports. ed/hb
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