428 APPENDIX E: CALLER ID
from the top line appears on the bottom line. After an additional five
seconds, if the Caller ID information from the top line exceeds the
capacity of both display lines, the numeric portion is removed and only
the name portion appears in the display.
Specific Caller ID Situations
The Caller ID information that appears in the telephone display panel can
be different in some specific call situations.
Analog Telephones Analog telephones can be connected to the NBX system using these
interfaces:
■NBX single port Analog Terminal Adapter
■A port on an NBX Analog Terminal Card
■Citel Analog Interface Card
Analog Terminal Adapter and Analog Terminal Card Ports
If you have an analog telephone connected to the NBX system using a
single port Analog Terminal Adapter or to a port on an Analog Terminal
Card, the behavior of Caller ID on the analog telephone (or on Caller ID
boxes connected in-line with the analog telephone) depends on whether
the Caller ID device/telephone supports 2-line Caller ID display.
■Most analog telephones with built-in Caller ID and most Caller ID
boxes do not support 2-line display of Caller ID information. For this
type of device, only the Caller ID of the original caller appears.
■If the analog telephone or Caller ID box supports 2-line display of
Caller ID information, the information appears in the same way as it
does on an NBX telephone.
If the Caller ID information exceeds the capacity of the Caller ID display
(some can display 16 characters and others can display 24 characters) the
Caller ID information is typically truncated at the width of the display.
Citel Analog Interface Card
If you have analog telephones connected to the NBX system using the
Citel analog interface card, the behavior of Caller ID on the analog
telephones is the same as the behavior of analog telephones connected
to a single port Analog Terminal Adapter or a port on an Analog Terminal
Card. See “Analog Terminal Adapter and Analog Terminal Card Ports” on
page 428.