Nortel Networks NN43001-563 User Manual download pdf (Page 21)

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Introduction 21

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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 Trunk 3.01 (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 Trunk 3.01 (and later) architecture

IP Trunk 3.01 (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 Trunk 3.01 (and later) processing. IP

Trunk 3.01 (and later) tandems the Mer idian 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 Trunk 3.01 (and later) can interwork

with the Gatekeeper to identify the destination node before routing directly

to that destination.

Two types of calls can be routed through interworking with the Gatekeeper:

directly-routed calls and Gatekeeper-routed calls.

Nortel Communication Server 1000

IP Trunk Fundamentals

NN43001-563 02.01 Standard

Release 5.5 21 December 2007

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