NEC Ds2000 Software Instructions Manual

System Timers, Trunks
DS1000/2000 Software ManualChapter 1: Features373
Flash DisconnectNot used. 2496mS
Force Idle (Trunk Guard 
Time)Use this timer to set the guard time for trunks. When 
the system disconnects a trunk (e.g., after a user hang 
up), the system keeps the line idle until this timer 
expires. The Trunk Guard Time helps prevent call col-
lisions.
If you set this interval too short, call collisions may 
occur. If too long, there will be unnecessary delays 
before you can use the trunk for...

System Timers, Trunks
374Chapter 1: FeaturesDS1000/2000 Software Manual
Manual DTMF Tone OnThis timer sets the duration of DTMF digits for trunk 
calls manually dialed by an extension user. This is 
required because the system buffers the digits the user 
dials.
Set this timer for compatibility with the connected 
telco or PBX/Centrex. If you set this interval too 
short, the telco or PBX/Centrex may not be able to 
properly detect the DTMF digit. If too long, outbound 
dialing is unnecessarily slowed...

System Timers, Trunks
DS1000/2000 Software ManualChapter 1: Features375
Setting for International 
Rotary DiskSet this option for compatibility with the type of 
rotary dial (500 type) telephone used. Be sure to 
always set this option to 0.0
(US standard)
Far End DisconnectUse this timer to set the loop disconnect interval for 
trunk calls. If the system detects a loop current inter-
ruption longer than this interval it assumes the telco 
has disconnected the trunk. It then returns the trunk 
trunk to...

System Timers, Trunks
376Chapter 1: FeaturesDS1000/2000 Software Manual
Rules for Detecting Normal CO (Single) Ring
1. The ring signal must be longer than the Minimum Ring Detection Timer (normally 104 mS).
2. The ring signal must also be longer than the Minimum Single Ring Detection Timer (normally 
504 mS).
3. The interval between ring bursts must not be longer than the Ringing Signal End Detection 
Timer (normally 6016 mS).
Rules for Detecting Special (Double) Ring
(This option is normally not...

System Timers, Trunks
DS1000/2000 Software ManualChapter 1: Features377
with unique incoming ring.)
1. The ring signal must be longer than the Minimum Ring Detection Timer (normally 104 mS).
2. The ring signal must be shorter than the Minimum Single Ring Detection Timer (normally 504 mS).
3. The off interval between the two double rings must be greater than the Minimum Double Ring 
Detection Off Timer (normally 104 mS) but less than the Maximum Double Ring Detection 
Off Timer (normally 304 mS). 
4. The...

System Timers, Trunks
378Chapter 1: FeaturesDS1000/2000 Software Manual
Conditions
None
Default Setting
Refer to the chart above.
Programming List
Refer to the chart above.
Other Related Features
Refer to the following for related feature information:
Program 0402 - Trunk Timers (page 459)
Feature Operation
None 

Tandem Trunking / Unsupervised Conference
DS1000/2000 Software ManualChapter 1: Features379
Tandem Trunking / Unsupervised Conference
Description
Tandem Trunking allows an extension user to join two outside callers in a trunk-to-trunk confer-
ence. The extension user can then drop out of the call, leaving the trunks in an Unsupervised Con-
ference. The extension user that established the Conference is not part of the conversation. The 
Conference continues until either outside party hangs up.
Tandem...

Tandem Trunking / Unsupervised Conference
380Chapter 1: FeaturesDS1000/2000 Software Manual
Programming Guide
Programming List
Program 0402 - Far End Disconnect (page 464)
Set the Far End Disconnect time for compatibility with the local telco.
Program 1003 - Tandem Trunk (page 510)
Enabled (Y) or disable (N) the trunk’s ability to be included in an Unsupervised Conference. 
Only one of the trunks in the tandem call must have this option enabled.
Other Related Features
The following features also allow...

Tandem Trunking / Unsupervised Conference
DS1000/2000 Software ManualChapter 1: Features381
Feature Operation
To set up a tandem call (Unsupervised Conference):
1. Establish trunk call.
2. Press 
CONF.
Your caller hears Music On Hold (if installed) while they wait for you to set up the 
Conference.
3. Place or answer trunk call
OR
Retrieve trunk call from Park Orbit.
4. Press CONF to set up the Conference.
If you cannot add additional parties to your Conference, you have exceeded the sys-
tem’s...

Tandem Trunking / Unsupervised Conference
382Chapter 1: FeaturesDS1000/2000 Software Manual
installed) while waiting on Hold. Press CONF to reinstate the Conference.
To set up Tandem Trunking at a Single Line Telephone:
1. Establish trunk call (e.g., lift handset, dial 9, and dial outside number).
2. Hookflash and dial another trunk call.
3. Hookflash and dial #10 to set up Conference.
4. Hang up.
If the outside parties disconnect, the trunks you selected do not have Tandem Trunking 
capability.