Nortel 1000 Fundamentals page 62

62 System description
Figure 17
ITG configuration
ISDN signaling between the Meridian 1 and IP Trunk 3.01 (and later)
supports the delivery of Calling Line Identification (CLID) and feature
messaging. ISL DCH signaling provides the necessary signaling connection
over which data, including CLID and feature-specific messaging, can be
passed.
On Large Systems, the DCH interface to the Meridian 1/CS 1000M uses the
MCDN or QSIG GF protocols and their variants to transmit call and feature
control messages to the DCHIP card. Small Systems use only MCDN
Copyright © 2007, Nortel Networks
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Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007