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Caller ID or Caller Number Delivery is a *paid* service that *may* be available 
from the local phone company.  One can *subscribe* to this service and get a 
ZyXEL modem to display the time, name and phone number of the calling party.

To enable Caller ID detection by the ZyXEL, type in "ATS40.2=1" in a terminal
program.  This procedure was paraphrased from pages 12-5 and 12-6 of the ZyXEL
User's Manual (Revision 2.1).  [pages 12-3 and 12-4 in the on-line version]  
It should enable Caller ID detection.

Should the above procedure be unsuccessful, then a hardware modification might
be necessary. (c.f. T.26A)