20
40-400-00001, Rev. A
Terminal Display Text
Many ISDN-BRI telephones, terminal adapters, and computer applications support a
display feature that accepts and shows formatted ASCII text delivered by the
network. The text may indicate an invoked feature or explain an error. Usually the
text indicates the name and Directory Number of the called or calling party. If the
Terminal uses Call Appearances, the Call Appearance identifier is also displayed for
the current call.
Some devices specify a switch provision indicating that the Display feature be
enabled or disabled. To change the setting,
STEP 1
Run the Windows based configuration software.
STEP 2
Select the Terminal Display Text setting.
STEP 3
Change the setting.
STEP 4
Select SAVE to save the setting.
STEP 5
Remove all communications devices from the Simulator and press the
DOWNLOAD button. An automatic RESTART is issued as part of the
DOWNLOAD.
When set to ON, the Simulator sends formatted display text to every device, which
includes the Call Appearance, Called (or Calling) Party Name, and Directory Num-
ber.
When the Simulator is configured for National ISDN-1, this text is sent in a
Display
Text Information Element following a Locking Shift 5 (National Codeset) Information
Element. For AT&T devices, the text is sent in multiple
Display Field Information
Elements which follow a
Locking Shift 6 (Network Codeset) Information Element.
If one or more devices do not support display text but others do, enable the Terminal
Display Text. The device(s) that cannot support these Information Elements simply
ignore them.
Note: The Simulator does not send display text if Caller Identification is
disabled.
Electronic Key Telephone Service (EKTS)
EKTS is not new and most people are familiar with the office telephones that employ
it. With a telephone and switch that support EKTS, multiple Directory Numbers may
share the same physical line.
The main protocol difference between standard ISDN devices, or Basic Mode
Terminals, and EKTS Mode Terminals is that the former are addressed using the
Called Party Number Information Element, while the latter support the Endpoint ID
Information Element. The Called Party Number is simply the Directory Number
associated with the physical telephone line when service was established. When an
incoming SETUP Message is received, all telephones connected to that line alert
the user. The user must then decide which device to use when accepting the call.
Using EKTS services, one or more telephones may be addressed individually.
ISDN-BRI terminals send a Service Profile ID (SPID) to the switch during initializa-
tion, and the switch returns an
Endpoint ID (TEI) Information Element unique to that
terminal. The EKTS terminal stores the TEI in its non-volatile memory. All subse-