Nortel Networks SRG 50 NN43001-307 - Manual (Page 217)

List of terms 217
ZDP
Zone Digit Prefix. This is the number that the main office appends to a local
SRG PSTN call dialed from an SRG IP Phone in Normal Mode. This number
differentiates the call from a main office PSTN call dialed by the main office
telephones. The ZDP routes the call through VoIP trunk to the SRG.
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.