User`s guide

Dialogic
®
System Release 6.0 PCI for Windows
®
Release Update, Rev 62 — January 30, 2008 170
Dialogic Corporation
For features specific to ISDN technology, see:
• Dialogic
®
Global Call ISDN Technology Guide
Note: The online bookshelf has not been updated for this feature, so the Dialogic
®
Global Call
ISDN Technology Guide does not currently indicate that NCAS is supported for QSIG on
DM3 Boards.
1.48 Loop Current Reversal Detection on Dialogic
®
DMV160LP Boards
The Service Update adds support for loop current reversal detection on the Dialogic
®
DMV160LP Media Board.
1.48.1 Feature Description
Certain service providers furnish polarity reversal to subscribers to signal that the called
(far end) party has answered a call (polarity reversal on seizure). Upon detection of
polarity reversal, the call should transition to the CONNECTED state.
With Dialogic
®
Springware Boards, the Voice API dx_setevtmsk( ) function can be used
to enable detection of loop current on, loop current off, and loop current reversal call
status transition events (DM_LCOFF, DM_LCON, DM_LCREV). However, detection of
these events using dx_setevtmsk( ) was not supported for DMV160LP Boards.
With this new feature, the Global Call API gc_SetConfigData( ) function can now be used
to provide similar functionality for DMV160LP Boards. The unsolicited
GCEV_EXTENSION event is used to notify the application when any of the new call
status transitions occur:
CC_CST_LCON
loop current on detected
CC_CST_LCOFF
loop current off detected
CC_CST_LCREV
loop current reversal detected
A typical sequence of events is: