Specifications

3.12 Direct Inward Station Dialing (DISD)
The DISD feature allows an external party to call an intercom station directly without assistance by the
attendant. The system must receive the DISD call on a line that you have programmed to allow this
feature. You can program any line to be a DISD line for both the normal mode of operation and the night
transfer (of ringing) mode of operation.
You can program the number of rings that the system allows on a DISD line. If you set a large number of
rings, stations that have a line appearance for the DISD line have time to handle the call in a regular
manner before the system takes control of the call. If you wish to dedicate a line for DISD use, it is a good
practice to set it for one ring so that the system can quickly take control of the call. By setting the number
of rings to 0, you can disable the line for DISD use.
You can program the amount of time the system allows for a DISD caller to dial an extension number.
You can also program the DISD assist station that will answer calls not completed during the dial time
limit.
It is a good practice for you to connect a music source to the system to let callers know they have not been
disconnected during a camp-on situation when the DISD feature is controlling the call.
You should make a record in Chapter 4 of all programming decisions that you make—it will help you
keep track of what you have done and will help you troubleshoot any problem that might arise later.
NOTE: A lighted LED next to the programming button for the selection indicates the current
configuration. When a single button provides a toggle (on/off) action, the lighted LED
indicates the active feature.
The first step in any programming sequence is to enter the base level. Once in this mode, you can dial the
feature code for any desired configuration. Enter the base level with the following procedure:
press INTERCOM then dial ✳# 746✳. When you want to end the programming, press the SPEAKER
button to end the programming procedure and return the system to normal operation.
3.12.1 Dial Time Limit
Description: When a caller does not complete extension number dialing within the programmed dial
time limit, the system routes a DISD call to the assist station if you have programmed
one; otherwise, it drops the line.
To Program: 1. Dial 44. “DISD DIALTIME X ”
2. Press program button to select dial time limit: (LED On = Enabled)
—Dial 1 or press A1 = 6 seconds “DISD DIALTIME 6”
—Dial 2 or press A2 = 9 seconds “DISD DIALTIME 9”
—Dial 3 or press A3 = 12 seconds “DISD DIALTIME 12”
—Dial 4 or press A4 = 15 seconds “DISD DIALTIME 15”
—Dial 5 or press A5 = 20 seconds “DISD DIALTIME 20”
—Dial 6 or press A8 = 30 seconds “DISD DIALTIME 30”
—Dial 7 or press A9 = 40 seconds “DISD DIALTIME 40”
—Dial 8 or press A10 = 60 seconds “DISD DIALTIME 60”
—Dial 9 or press A11 = 90 seconds “DISD DIALTIME 90”
—Dial 0 or press A12 = 0 seconds. “DISD DIALTIME 0”
3. Press ✳ for configuration mode.
To change setting, repeat procedure and make different selection.
IMI66–132 DSU II Digital Telephone System
3 – 100 Programming The DSU II System