AT&T System 25 - Manual (Page 162)

SYSTEM TESTS
TEST INCOMING DID TRUNKS
You can test DID trunks by establishing a connection on each DID trunk and
then busying it out so that all DID trunks can be tested.
1.
2.
3.
4.
5.
6.
7.
At a working voice terminal, go off-hook, dial the CO trunk access
code, and then dial a DID number.
You should hear ringback at the calling terminal and ringing
at the called terminal.
At the called terminal, go off-hook and verify transmission.
At both terminals, lay the handsets down so that the call remains
active. If using a multiline terminal, put the call on hold and place
another call (step 1).
Place a second call from another terminal to another DID number in
the system and verify transmission.
Now, place as many calls as there are DID numbers in the system
(alternating terminals and numbers). Verify transmission in each
c a s e .
At all voice terminals used for this test, go on-hook.
If there are not enough dial-up CO trunks, work with the CO to check
all trunks or have someone call from the outside to check each DID
trunk.
TEST INCOMING TIE TRUNKS
1. At the other tie trunk site, go off-hook and access a tie trunk. To test
a dial repeating tie trunk, dial a System 25 voice terminal. (No
dialing is required to test an automatic incoming tie trunk.)
You should hear ringback at the distant terminal and ringing
a t
2. At the test
3. At the test
the called terminal (with incoming tie trunk appearance).
terminal, go off-hook and verify transmission.
and distant terminals, go on-hook.
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