AT&T System 25 - Manual (Page 174)

SYSTEM
TEST
TESTS
MUSIC-ON-HOLD
Verify that music is provided to outside callers placed on hold. (Inside callers
do not receive Music-on-Hold [MOH].)
1.
2.
3.
4.
5.
At any working voice terminal, go off-hook. Dial the CO trunk access
code and the system’s listed directory number, or if DID, dial any
station.
At the called
At the called
The
station, answer the incoming call.
station, press HOLD.
line button’s green LED should flash.
Verify that music is heard at the calling voice terminal.
At the calling voice terminal, go on-hook.
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