Iwatsu ENTERPROSE-CS Owner's Manual page 130

Busy Number Callback
Allows you to instruct the ECS to periodically call you to try calling a
previously dialed outside number again. To have the ECS dial the number
simply pick up the receiver.
When you dial an outside number and there is no answer or a busy signal:
 Do not hang up.
 Press the Feature key FEAT then dial
Callback key TRNK C/B if assigned as a Multipurpose Key and the
lamp will be solid red.
 Wait for a confirmation tone.
 Hang up.
To change the Callback time interval:
 Dial the desired interval time in minutes
To Cancel:
 Press the Speaker key SPKR
 Wait for the dial tone
 Press the Feature key FEAT then dial
Number Callback key TRNK C/B if assigned as a Multipurpose key

then dial and the lamp will be off.
 Wait for a confirmation tone.
 Press the Speaker key SPKR.
Busy Outside Line Queuing
Allows you to instruct the ECS that you wish to be notified when the outside
lines are no longer busy. When an outside line becomes available, your phone
will ring. Picking up the receiver will give you outside dial tone. If you
previously dialed the outside number, that number will automatically be dialed
when the receiver is picked up.
When attempting to make an outside call and all lines are busy:
 Do not hang up.
 Press the Feature key FEAT then dial
 Dial the phone number, or, press the Busy Outside Line Queue key
TRNK QU if assigned as a Multipurpose key, you will hear tones and
the lamp will be solid red.
 Dial the phone number.
IWATSU TELEPHONE USER GUIDE - 112

, or, press the Busy Number

before you hang up.

, or, press the Busy

and you will hear tones.