NEC DS1000 Product Description page 124

Glossary
Do Not Disturb
Door Box
DSTU
Expansion Board
Extended Ringing
Extension Hunting
Extension Ringdown
External Paging
Exclusive Hold
116 Section 5: Glossary
Blocks incoming calls, Off-Hook Signaling, and Paging announcements
at an extension.
Reference: Do Not Disturb on page 45.
A unique station instrument, typically placed next to an entrance door,
that allows visitors at the door to communicate with selected internal
extensions. The Door Box works like a door bell with an integral speaker
and microphone.
Door Box on page 46.
Reference:
Digital Station Port.
16DSTU Digital Station PCB (P/Ns 80021 and 80021A) on
Reference:
page 12 and DS1000 Cabinet (P/N 80200) on page 15.
Expands the capabilities of the DS1000 system.
Reference: DS1000 Expansion Board (P/N 80221) on page 16.
Allows calls to ring specific extensions (such as warehouse telephones)
for an extended number of rings before the calls follow the system's nor-
mal rerouting procedures.
Extended Ringing on page 47.
Reference:
An internal system call routing facility that allows calls to route to a pre-
defined group of hunt group member extensions. There are three types of
extension hunting: Circular Hunting, Terminal Hunting, and Uniform
Call Distribution (UCD) Hunting.
Extension Hunting on page 47.
Reference:
See Ringdown Extension on page 123 in this glossary.
See Paging on page 122 in this glossary.
A type of Hold for outside (trunk) calls that allows only the extension
that initially placed the call on Hold to retrieve it from Hold. See also
Automatic Hold on page 112, Intercom Hold on page 119, and System
Hold on page 125 in this glossary.
Hold on page 54.
Reference:
DS1000/2000 Product Description