Nortel Networks NN43001-563 - page 21

Introduction 21
•handles the call based on the return message from the Gatekeeper
IP Trunk 3.01 (and later) accesses additional devices through the
Gatekeeper. It is no longer necessary to individually provision the entire
mesh at each IP Trunk 3.01 (and later) node. Instead, the calls go to the
Gatekeeper, which provides the IP Trunk3.01 (and later) application with
the correct destination for the call. See Figure 1 "IP Trunk 3.01 (and later)
architecture" (page 21).
Figure 1
IP Trunk3.01 (and later) architecture
IP Trunk3.01 (and later) uses the Meridian 1/CS 1000M core switch as the
primary driver, which sends ISDN messages through the ISDN Signaling
Link (ISL) to the IP trunk card for IP Trunk3.01 (and later) processing. IP
Trunk3.01 (and later) tandems the Meridian 1/CS 1000M core switch to the
IP network, providing point-to-multipoint connection.
Alternatively,depending on the provisioning and the requested destination,
if a call cannot be resolved locally, IP Trunk3.01 (and later) can interwork
with the Gatekeeper to identify the destination node before routing directly
to that destination.
Twotypes of calls can be routed through interworking with the Gatekeeper:
directly-routed calls and Gatekeeper-routed calls.
Nortel Communication Server 1000
IP TrunkFundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
Copyright© 2007, Nor tel Networks
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