ISDN Demonstrator User’s Manual
40-400-00011, Rev. B
17
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 Number.
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 initialization, 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 subsequent SETUP messages sent to that
line may then address all, some, or only one device using the TEI.
If the communications device does not store a TEI, then the Simulator’s
EKTS setting should be disabled.
STEP 1
Run the Windows based configuration software.
STEP 2
Select the EKTS setting.
STEP 3
Change the setting.
STEP 4
Select
SAVE
to save the setting.
