Avaya Nortel Communication Server 1000 Reference page 389

Operation
Figure 108: Ground start call connection sequence - incoming call from CO/FX/WATS
Polarity-sensitive/-insensitive packs feature
The CS 1000 software provides the polarity-sensitive/polarity-insensitive (PSP and PIP) packs
feature for the accurate recording of outgoing call duration for loop start and ground start
operation.
On trunks equipped with far-end answer supervision, the PSP class of service is enabled in
software and causes call-duration recording in CDR records to begin only upon receipt of
answer supervision from the far-end.
For trunks not equipped with answer supervision, the PIP class of service is enabled and call-
duration recording begins immediately upon near-end trunk seizure. The PSP and PIP classes
of service are enabled in the Trunk Administration program LD 14.
Circuit Card Reference July 2011 389