OOPS! The cable you asked about is the one that connects the line and extension cards to an expansion block like, for instance, a 66-block. You can google this part no. and buy one for about $45-$50. You could possibly find some small black connectors that would fit these pins in a computer store. They are similar to the connectors used in a PC computer for the power switch, reset button, sound header and USB header.

Also you might go back to wherever this system came from and see if the cable is still there. If the cable is already punched down to a 66-block, then take that too. If the cable was cut off outside the system box, then the connectors are still inside the system. They are small blue plastic rectangles with two wires going to each one. Just hook them up to a 25 pair cable or punch them down to a 66-block. It helps here if you know the telco color code: bogbrs wrbyv

Vaya con Dios amigos!
Butch