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This is a KX-TD187 T1 Card for the Panasonic KX-TD1232 Digital Hybrid System 

Panasonic KXTD187 T1 Expansion Card for KX-TD1232 only. Designed to interface with any mix of up to 24 voice channels (64 kilobit time slots) of digital T1 trunk. Note: The KXTD187 cannot be connected directly to the Telephone Company's Central Office lines without the use of a Channel Service Unit (CSU). The CSU is a device that supplies conditioning for the T1 line and requires FCC part 68 functions of surge protection and keep alive. The CSU must be purchased independently. There are several manufacturers and models of CSU available that support the required National ISDN/T1 1(NI-1) which we have successfully tested. WeSellPanasonic.com carries the ADTRAN CSU ACE. The KXTD187 T1 card cannot be installed on the KXTD816.