1. Press
2. Press
Result:
The test is canceled.
The Display Panel
Display Information
A display panel is at the top of the digital desk set. When a call is not in progress, the panel shows the date and time of day. When a
call is being placed or received, information about the call is displayed, as shown on the diagram below (details on each part of the
display follow):
Letter designating which CA is carrying the call.
A.
On outgoing calls, the number you enter; on incoming calls, information on the origin of the call.
B.
A
Call Identifier
that defines the type of call.
C.
Elapsed time of the call.
D.
Display Panel Contrast Adjustment
To the right of the display panel is a wheel for adjusting the contrast of the display. Turn the wheel upward to darken the contrast; turn
the wheel downward to lighten it. Experiment with the contrast adjustment to get the best display for your lighting conditions.
Call Appearance Designations
For all calls, a green light indicates which Call Appearance (CA) button carries the call. On the display panel, the CA carrying a call is
also identified by a letter:
On the Model 7506 desk set, the nine CAs are designated by the letters
a
through
j
.
On the Model 7507 desk set, the thirty CAs are designated by the lowercase letters
a
through
z
and the uppercase letters
A
through
D
.
Directory Number
When you place a call, the display shows the digits as you enter them. When you receive a call, information on the origin of the call is
displayed. For calls received from an on-campus phone, that phone's number is shown unless the caller has disabled such
identification, in which case PRIVATE NUMBER is displayed (see "
Number privacy
"). Calls received from off-campus phones are
shown as INCOMING CALLS. Additionally, number privacy works when calling off-campus numbers on phones that have caller ID.
Call Timing
Once an incoming or outgoing call is answered, the elapsed time of the call in hours, minutes, and seconds is shown in the lower-right
portion of the panel.
Call Identifier Codes
When you place or receive a call, Call Identifier codes are shown in the upper-right portion of the display panel. The table below lists,
alphabetically, the most frequently encountered codes and their meanings.
5ESS Digital (ISDN) Telephone User Guide | IS&T
https://ist.mit.edu/services/telephony/isdnguide
14 of 16
12/20/11 3:12 PM
