AT&T MERLIN LEGEND Installation & Maintenance Manual page 229

Installation
You should hear a dial tone for a working line/trunk, a reorder
tone for a DID trunk or an invalid line/trunk number, or a busy
tone if the Iine/trunk is in use.
Note: Dialing ∗03 on a single-line telephone works only if the
line/trunk accepts touch-tone dialing. After you dial ∗ 03 on a
single-line telephone, you may have to wait for a "click" before
dialing the line/trunk number.
2. Repeat for all outgoing lines/trunks.
3. Dial an incoming line/trunk on the system.
4. Have someone answer the call at another telephone; verify
that you have good two-way communication.
Repeat steps 3 and 4 for all incoming lines/trunks.
5.
6. Hang up to exit the test mode.
Test the DID Trunks
Follow these steps to test the DID trunks:
Pick up the handset at the test terminal. Dial ∗03 and then
1.
dial a DID number.
You should hear ringback at the calling telephone and should
hear ringing and see the green LED turn on at the called
telephone.
Note: Dialing ∗03 on a single-line telephone works only if the
line/trunk accepts touch-tone dialing. After you dial ∗03 on a
single-line telephone, you may have to wait for a "click" before
dialing the line/trunk number.
2. someone pick up the handset on the called telephone;
Have
verify that you have good two-way communication.
3. At the calling telephone, put the call on hold. Have the person
at the called telephone keep the call active by either placing it
on hold or laying the handset down.
System Acceptance Test 3-121