for presentation

2.  Caller ID (caller identification, CID),
also called
 calling line identification (CLID),
 calling number delivery (CND),
 calling number identification (CNID)
or
 calling line identification
presentation (CLIP)

4. Caller ID is a telephone feature that
displays a caller’s phone number on
the recipient's phone device before
the call is answered. The phone
number, location and associated
billing or subscriber name is shown
on the handset’s display or a separate
caller ID box attached to the phone.

5. Number Only:
 Single Data Message Format (SDMF) is used,
where the displayed information includes only
the caller’s telephone number and the date and
time of the call.
Number Plus Name:
 Multiple Data Message Format (MDMF) is
transmitted, and the directory name is added to
the displayed information.

6.  If you have Call Waiting, Caller ID doesn’t display
information for any calls that come through when
you’re on the telephone unless you have Call
Waiting ID on your line and compatible equipment.
 If your caller is using a privacy feature, the Caller ID
display may read “Private Number” instead of the
caller’s name/ number.
 Some calls may show “Out-of-Area” instead of the
caller’s name/number because the calling
information was not received.