If a called extension is busy, Idle Extension Hunting redirects the call to an idle member of the same extension group, if that group has been assigned as an idle extension hunting group through system programming (

Hunting Group Set [100]). Idle extensions are automatically searched for according to a preprogrammed hunting type (

Hunting Type [101]).

This feature is also known as Station Hunting.

Type

Description

Circular Hunting

An idle extension is searched for in a circular fashion one time according to the numerical order of the jacks.

Terminated Hunting

An idle extension is searched for in the numerical order of the jacks, until reaching the extension that is connected to the highest-numbered jack in the group.

•	Idle Extension Hunting applies to: Intercom calls and outside (CO) line calls directed to a single extension.
•	An extension can belong to only one extension group ( Extension Group [600]). One hunting type can be programmed for each extension group.
•	If all the searched extensions are busy, a busy tone will be heard.
•	A user can leave an idle extension hunting group temporarily by logging out of the group, and rejoin the group by logging back in ( 1.2.4 Log-in/Log-out).
•	FWD/DND Mode When searching for an idle extension within an idle extension hunting group, any extension that has set FWD, DND, or Log-out will be skipped ( 1.3.1 Call Forwarding (FWD)/Do Not Disturb (DND)). However, if the extension that receives the call first has set FWD or DND, Idle Extension Hunting will not function and the call will be forwarded to the preprogrammed destination (when FWD is set) or will not be received at all (when DND is set).
•	Message Waiting A message waiting indication will not be sent to an idle extension hunting destination. The MESSAGE button light or Message/Ringer Lamp turns on at the original destination only ( 1.17.1 Message Waiting).

Uniform Call Distribution (UCD) distributes incoming calls to an idle member of the same extension group, if that group has been assigned as a UCD group through system programming (

UCD Group [520]). Available extensions are searched for in a circular fashion in numerical order. The UCD feature is particularly helpful when a certain extension typically receives more calls than other extensions.

[Example of UCD Group]
The numbers found in circles below indicate calls and the order in which they arrived.

[Flowchart]

UCD Busy Mode

When all extensions in a UCD group are busy, a call will wait for a preprogrammed length of time (

UCD Busy Waiting Time [521]). If this timer expires, the PBX will handle the call in one of the following ways according to system programming (

UCD Busy Mode [523]):

a)	Disconnect: The call is disconnected immediately.
b)	Disconnect-OGM: The call is disconnected after a UCD outgoing message (OGM) plays (e.g., "We are still handling other calls. Please call back later.").
c)	Intercept-Normal: The call is directed to preprogrammed destinations ( Flexible Ringing—Day/Night/Lunch [408-410]).
d)	Intercept-DISA: The call is directed to the DISA feature ( 1.15.6 Direct Inward System Access (DISA)) and the caller hears a DISA OGM (e.g., "Thank you for calling Company A. Press 1 to speak to Sales. Press 2 to speak to Support.").

UCD Intercept Mode

When extensions in a UCD group are available but do not answer an outside (CO) line call within a preprogrammed length of time (

UCD Ring Time before Intercept [525]), the PBX will handle the call in one of the following ways according to system programming (

UCD Intercept Mode [524]):

a)	Disconnect: The call is disconnected. If a UCD OGM is not played, the call will not be disconnected until the caller goes on-hook.
b)	Intercept: The call is directed to preprogrammed destinations ( Flexible Ringing—Day/Night/Lunch [408-410]). The extensions that receive the redirected call ring for a preprogrammed time period ( UCD Ring Time after Intercept [526]). When the timer expires, the call is disconnected. If a UCD OGM is not played, the call will not be disconnected until the caller goes on-hook.

•	To use this feature, "UCD" must be selected as the distribution method for the desired outside (CO) line port ( CO Line Mode—Day/Night/Lunch [414-416]).
•	UCD OGM It is possible to select the UCD OGM sent to the caller when a call arrives at a UCD group and all extensions in the group are busy ( UCD Waiting Message [527]).
•	The Log-in or Log-out status can be set for each extension ( 1.2.4 Log-in/Log-out). The last member of a group cannot log out.
•	FWD/DND Mode When searching for an available extension, any extension that has set FWD—All Calls, FWD—Busy/No Answer, or DND will be skipped ( 1.3.1 Call Forwarding (FWD)/Do Not Disturb (DND)).
•	UCD Busy Waiting Time It is possible to assign the length of time ( UCD Busy Waiting Time [521]) the PBX holds an incoming outside (CO) line call via the UCD feature when all extensions in the UCD group are busy, and to assign the interval time between the repeated UCD OGMs ( UCD OGM Message Interval Time [522]).
•	Cyclic Tone Detection It is possible to select the number of times a cyclic tone must be detected while the UCD OGM is sent ( Cyclic Tone Detection [513]). Cyclic Tone Detection can be used to disconnect an outside (CO) line call via UCD.

A Direct Inward System Access (DISA) ring group is a specific extension group that receives DISA calls directed to the group. All extensions in the DISA ring group assigned as an Automated Attendant (AA) destination (

DISA Built-in AA [501]) ring simultaneously.

Delayed Ringing
Each extension can be programmed for Delayed Ringing (

Delayed Ringing—Day/Night/Lunch [411-413]), which allows extensions to be alerted to calls by flashing buttons only. Received calls can be answered even if they are not ringing.

Members of an idle extension hunting group, Direct Inward System Access (DISA) ring group, or Uniform Call Distribution (UCD) group can join (Log-in) or leave (Log-out) groups manually. Group members can log in at the beginning of a work shift when they are ready to answer calls, and log out at the end of the work shift.

•

The last member of a group cannot log out.

•

While logged out from a group, a member extension will not receive calls to that group via the DISA, UCD, or Idle Extension Hunting features.

•

Log-in/Log-out Button
A flexible CO button can be customised as a Log-in/Log-out button. It shows the current status as follows:

Light Pattern

Status

Red on

Logged out

Off

Logged in

•	1.1.1.2 Intercept Routing
•	1.12.4 Music on Hold
•	2.2.2 Group

•	To use this feature, "DISA" must be selected as the distribution method for the desired outside (CO) line port ( CO Line Mode—Day/Night/Lunch [414-416]), and DISA AA service must be assigned as the destination of incoming outside (CO) line calls via the DISA feature ( DISA Incoming Call Dial Mode [500]).
•	The Log-in or Log-out status can be set for each extension ( 1.2.4 Log-in/Log-out). The last member of a group cannot log out.

•	1.2.1 Idle Extension Hunting
•	1.2.2 Uniform Call Distribution (UCD)
•	1.2.3 Direct Inward System Access (DISA) Ring
•	1.18.2 Flexible Buttons