
Do Not Disturb (DND)
You can dial a feature code (#01 by default) from your industry standard telephone and put the
telephone into a do not disturb (DND) condition. While in this condition, an outside call forwards to
another station or to the attendant according to the call forwarding feature. An intercom call will not
ring the DND station and the system sends a fast busy signal to the caller to distinguish the DND
from a standard busy line.
Flash Time
The flash time is the timed length of the signal delivered when a user presses the hookflash (or TAP)
button. The installer can program both the minimum and maximum times that define the IST flash.
Hold Confirmation
Hold confirmation allows the industry-standard telephone users to have positive tone feedback while
on hold.
Off-hook Treated as Busy
When an industry-standard telephone user takes the telephone’s handset off hook, the IST station
appears busy to the system. This feature prevents the system from ringing an IST station while the
station is idle and off hook making it unable to sound audible ringing.
Message Wait Retrieval Access Code
This feature allows IST station users to respond to a message waiting condition without using the
central message desk. They do this by dialing a special intercom feature code that lets them respond
directly to a waiting message.
Ring Frequency
The system installer can set a ring frequency of 25 Hz for international applications or set a ring
frequency of 21 Hz for domestic applications. He or she must choose a setting that matches the
frequency of the installed ring generator.
Ring Patterns
Installer can program the ringing pattern for either IST ring mode one or IST ring mode two. Mode
one causes a two-second ring phase while mode two causes a shorter one second ring phase.
Ringing on Busy
When an industry–standard telephone is busy on a call and another call comes to that telephone, the
system sounds three quick tone bursts to the telephone’s handset receiver. You must program the
ringing on busy feature.
Understanding the Features – 107
General Description GCA40–242
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