Dialed Disa Number Gets Ringback Instead Of Stuttered Dial Tone - Nortel Modular ICS 6.0 Installer's Manual

2. If the E&M trunks are connected to another Norstar
system, make sure that connections have been made as
indicated in Installation on page 209.
3. Use the following table to check for correct voltage on the
E&M/DISA leads:
Voltages on E&M leads
Leads
V
T-R
V
T1-R1
V
E-SG
V
M-SB
Dialed DISA number gets ringback instead of
stuttered dial tone
The remote caller has dialed a DISA number, but has instead
reached a target line, or has been routed to the prime telephone
for the auto-answer trunk. The Norstar system has mapped the
incoming digits from a switch onto a target line, or has been
unable to map the digits anywhere.
Solution
1. Verify that the switch is sending the correct number of
digits for the Received number length defined in your
system.
2. Verify all the digit strings that the switch should be
sending.
3. Check that you have defined the correct DISA DN for your
system.
4. Make sure that the published telephone numbers for your
network are correct.
P0992638 03
Problems for network or remote users / 581
Voltage: active
125 mV AC on steady dial tone
125 mV AC on steady dial tone
0 V DC to -5 V DC
0 V DC to + 2 V DC
Voltage: inactive
0 V AC
0 V AC
-48 V DC
-48 V DC
Modular ICS 6.0 Installer Guide