Nortel Modular ICS 6.0 Installer's Manual page 577

2. Verify all the digit strings that the switch should be
sending.
3. Check that you have defined the corresponding Received
number for every target line in your system.
4. Make sure that the published telephone numbers for your
network are correct.
Dialed number gets stuttered dial tone instead of
ringback
Possible problem
The remote caller has tried to reach a Norstar target line, but
has reached a trunk with DISA instead.
Alternatively, the Norstar system has mapped incoming digits
onto the DISA DN.
Solution
1. Verify all the digit strings that the switch should be
sending.
2. Check that you have defined a corresponding Received
number for every target line in your system.
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 / 577
Modular ICS 6.0 Installer Guide