Tandem Trunking / Unsupervised Conference - NEC DS1000 Product Description

Section 3: Features

Tandem Trunking / Unsupervised Conference

90 Section 3: Features
Option
Far End Disconnect
Minimum Single Ring
Detection Timer
Minimum Double Ring
Detection Off Timer
Maximum Double Ring
Detection Off Timer
Ringing Signal End
Detect Timer
P.F. Recovery Detect
Timer
Join two callers in
Conference, leave the call
and let their conversation
continue.
is not part of the conversation. The Conference continues until either outside party hangs up.
Tandem Trunking uses a Conference circuit. The following table shows the system's Conference
capacities:
Conference circuits
Maximum simultaneous users in Conference
(total of all Conferences system-wide)
Maximum simultaneous conferences
Maximum parties in any one Conference
(trunks and/or extensions)
Table 8: Trunk Timers
Use this timer to set the loop disconnect interval for trunk calls.
If the system detects a loop current interruption longer than this
interval it assumes the telco has disconnected the trunk. It then
returns the trunk to idle.
The system uses this timer to detect valid ringing signal from the
connected telco or PBX. Valid single ring must be longer than
this interval.
The system uses this timer to detect valid double ring from the con-
nected PBX. Valid double ring must be longer than this interval.
The system uses this timer to detect valid double ring from the
connected PBX. Valid double ring must be less than this interval.
If the ringing signal on a trunk call is interrupted for longer than
this interval, the system assumes ringing has stopped and termi-
nates the call.
When the ATRU PCB recovers from a power failure, it checks
the power failure trunk (trunk 1) for loop current for the P.F.
Recovery Detect interval. If loop current is detected, it assumes
the Power Failure Telephone is still connected and does not tear
down the call. If loop current is not detected, the ATRU PCB
switches the trunk out of the power failure mode.
Availability: All versions.
Tandem Trunking allows an extension user to join two outside
callers in a trunk-to-trunk conference. The extension user can
then drop out of the call, leaving the trunks in an Unsupervised
Conference. The extension user that established the Conference
Description
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Description
Capacity
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DS1000/2000 Product Description