296 DBS 576 (USA), Revised 6/11/98 576-13-700
Appendix A. ARS and TRS Operation Section 700 - Operation
TRS Programming/Operation Overview
The purpose of TRS is to restrict outside call origination based on the number dialed and the originator.
As shown in Figure A-4 TRS Operation (Non-ARS) at the end of this appendix, up to 50 TRS Classes settings
are assigned. When a call is originated, several general settings for the or iginator are always considered:
•Digit Restriction - This is the maximum number of digits that can be dialed.
•Incoming Dialing Restriction - If this is enabled, an outside call cannot be originated during an
incoming call.
•Outgoing SSD Dialing Restriction - This determines if S SD dia ling is allowed or not.
•Star (*) and Pound (#) Dialing Restriction - This determines i f the * and # digits can be outdialed.
When a call is origin ated, the system determ ines the TRS class fo r the originator from e ither the Trunk Class
Assignments or the Extension Class Assignments. It then determines the originator TRS level for the trunk
group selected.
When the call is dialed, the sys tem collects the digits and compares the leading digits to the leading digits table
entry. The system will look for the longest available exact match. A * may be entered as a wild card for any
digit position.
If an exact match is found, the system will look to see if there is a Prefix ID. If so, it will jump to the analyze
digits table. If not, the system will compare the entered TRS Restriction value to the call originator’s assigned
TRS level. If the originator’s TRS level is not greater than the Restriction TRS level, the call is denied.
Otherwise, the call is allo w e d to p ro c ee d.