AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual page 85

Telephone Problems
Procedure
Using a single-line telephone, test the TTRs as follows:
Pickup the handset, dial
1.
tested.
If you hear a busy tone, the receiver is in use.
If you hear a reorder tone, you have misdialed or have reached
an invalid TTR.
If you hear a dial tone, continue this test.
Dial 123456789
2.
You should hear a dual-tone multifrequency (DTMF) signal as each
button is pressed. If the test is successful, you will hear a three-beep
confirmation tone within one to three seconds after you enter # .
3.
Hang up and repeat the test for each TTR.
4.
Replace the module containing the faulty TTR if this test fails.
NOTE:
If all TTRs fail this test, repeat the test using a telephone that is known to
be working. If the test completes successfully, replace the original
telephone.
Symptom
User cannot make outside calls on touch-tone telephone.
Procedure
Check the individual trunk for rotary-dial programming.
See the System Programming guide for details.
04 , and the 2-digit number of the TTR to be
0#
Fixing Telephone Problems 3-7