Instruction manual

Page 1933 of 3156
Features and Services
Loop Start Supervisory Trunks
(Incoming Calls)
Contents
The following are the topics in this section:
Feature description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1933
Operating parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1934
Feature interactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1934
Feature packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1934
Feature implementation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1935
Task summary list . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1935
Feature operation . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1935
Feature description
This feature adds disconnect supervision for incoming calls from the Public
Switched Telephone Network (PSTN) or Central Office (CO), FEX, or
WATS loop-start trunks. This is in addition to the existing answer and
disconnect supervision available on outgoing trunks for the loop start
supervisory trunk feature provided on Group A of the Generic X11
Supplementary Features.
The disconnect supervision on incoming calls applies only to Polarity
Insensitive Packs (PIPs). It is the change in polarity (reverse battery), rather
than the absolute polarity, that must be detected.
A change in polarity from the PSTN side indicates that the calling party has
discontinued the call. The detection of this supervision signal allows a Call
Detail Recording (CDR) record to be produced and the trunk to be idled.