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If
all/any CO.Jn. Lines are/is busy, this feature informs
the user as soon as the CO.Jn. (Trunk Line) gets
free. If a user gets a busy tone after attempting
to seize any CO.Jn. Line, wait for a few seconds
for the dial tone to return or flash to get system
dial tone & then operate as follows.
Dial
 and
Hang up.
Wait
for the extension to ring, Lift handset &
hear telephone line dial tone and dial the desired
external number. If extension doesn’t respond
in three rings, the auto call-back on CO gets
cancelled.
To cancel
this feature operate as follows, Lift handset,
hear system dial tone,
Dial
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