Panasonic HYBRID IP-PBX KX-TDA50 - Manual (Page 63)

2.3 Information about the CO Line Cards
Installation Manual 63
2.3.2 CID4 Card (KX-TDA5193)
Function
4-port Caller ID signal type FSK/FSK (with Call Waiting Caller ID [Visual Caller ID])/DTMF. To be mounted
on the LCOT4 card.
Accessories and User-supplied Items
Accessories (included): none
User-supplied (not included): none
Note
If you need to remove the CID4 card:
CID4 Card
LCOT4 Card