That depends on which software version you put in.
IF you are at 6.1 or higher, then basically any phone that rings can get caller ID.
If it is lower, than only 1 phone can on that ringing line.
6.1 and up:
Go into prog for EACH PHONE that has a ringing line.
Go to Telco / Feature assign / Show each line - first prompt is Caller ID Set: make it YES.
Go to next ringing line - set to yes.
etc....
THEN go to next phone ext and repeat.
DS card will NOT show caller ID.