
Chapter 5 Configuring VoIP trunks 91
IP Telephony Configuration Guide
Gatekeeper call scenarios
This section explains what must be set up, and how a call would be processed for the two types of
gatekeeper configurations. Figure 35 shows a network with three Business Communications
Managers and a gatekeeper.
Figure 35 Business Communications Manager systems with a gatekeeper
This example explains how a call from DN 321 in Ottawa would be made to DN 421 in Santa
Clara. It assumes that call signaling is set to Gatekeeper Resolved and no pre-granted ARQ has
been issued:
1 Business Communications Manager Ottawa sends an AdmissionRequest (ARQ) to the
gatekeeper for DN 421.
2 The gatekeeper resolves DN 421 to 10.10.10.19 and returns this IP in an AdmissionConfirm to
the Business Communications Manager Ottawa.
3 Business Communications Manager Ottawa sends the call Setup message for DN 421 to the
gateway at 10.10.10.19, and the call is established.
gatekeeper
IP:10.10.10.17
Business Communications Manager Ottawa
IP:10:10:10:18
Business Communications Manager Santa Clara
IP:10:10:10:19
Business Communications Manager Calgary
IP:10:10:10:20
IP network
DN 521
DN 421
DN 321
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