Specifications

Features
143
Transfer Security
(Recall)
This feature is designed to prevent the dropping of mishandled calls. If an extension, during
transfer, hangs up before completing dialing, or if the transfer is not allowed, the call that
was placed on hold by the original extension flashing, automatically calls back to that
extension. This also applies to conference calls.
Trunk Answer
From Any Station
(TAFAS)
Allows the user to answer incoming calls appearing at common alerting devices (night
bells). The user can answer calls for a single tenant or for all tenants in the system. The
answering extension can then invoke any feature associated with the incoming call that is
normally available at that extension. TAFAS can also be used to answer certain calls which
ring at the console during the day.
Trunk Circuit
Descriptor
Options
Trunk circuit descriptors specify the programmable hardware parameters of each trunk
circuit in the system. Each trunk in the system must have a trunk circuit descriptor number
with an associated set of selected options.
Trunk Dial Tone
Detection
After accessing a trunk the system tries to detect dial tone on it. If dial tone is detected
before time-out, the system begins sending digits. If no dial tone is detected after the
time-out period and limited wait is specified, the system automatically begins sending digits.
Trunk Groups Trunk groups are defined and used in the ARS forms in CDE to control extension access to
trunks, to define trunk options, and to apply features to trunk groups.
Trunk Operation -
Direct Inward Dial
(DID)
DID trunks allow incoming trunk calls to reach extensions without Attendant intervention or
assistance. The length of the incoming number, the number of digits to be absorbed, and a
prefix digit, if required, can also be specified through CDE programming. Calls arriving at
the system on DID type trunks are assumed to be outside calls. Callers therefore receive
different call progress tones. Call handling differs from Tie and DISA trunk type calls, which
are assumed to be internal calls.
Trunk Operation -
Direct Inward
System Access
(DISA)
Allows an external caller to access the system by dialing the directory number of a special
DISA trunk and then dialing a security code. After the code is dialed the system returns Dial
Tone to the caller, who may then access any features in the DISA trunk’s COS which do not
require a Switch Hook Flash. Optionally, the external caller can be required to enter a
special account code rather than the standard DISA Access Code. See Account Codes -
Verified (Special DISA), DISA trunks can be supported on many different hardware types.
See Trunk Support - T1, Trunk Support - DID, Trunk Support - E & M. A trunk can be
programmed as DISA at all times, or during night service only.
Trunk Operation -
Non-Dial-in CO
CO trunks usually carry calls between the local central office and the PBX. Calls arriving on
CO trunks are assumed to be outside callers. Callers therefore receive different call
progress tones. Call handling differs from Tie and DISA trunk type calls, which are assumed
to be internal calls. CO trunks are assigned an origination point for DAY, NIGHT1, and
NIGHT2 service. They can optionally be assigned as a dedicated line on a Superset or Mitel
IP telephone. The NIGHT1 or NIGHT2 service for CO trunks can be changed directly from
the Attendant Console.
Trunk Operation -
Tie
Tie trunks allow incoming trunk calls to reach extensions directly, without attendant
intervention or assistance. The number of digits expected from the trunk is unknown. Digit
absorption and adding prefix digits can be done. Calls coming into the system on Tie type
trunks are assumed to be callers from inside the company, similar to DISA trunk type calls.
The callers therefore receive the same call progress tones that internal callers hear and may
have access to many extension features.
Table 6: Features supported by SX-200 ICP (continued)
Feature Description
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