Avaya Business Communications Manager 5.0 - Planning and Engineering User Manual Page 190

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190 VoIP trunk gateways
Nortel Business Communications Manager 5.0
Planning and Engineering
NN40170-200 01.03 Standard
August 2009
Copyright © 2009 Nortel Networks
case, system A is controlling remote access through remote access packages
and routing, transferring the outside call to a VoIP trunk, which is accessed by
an allowed dial sequence. The VoIP trunk connects directly to system B,
where the dialing sequence is recognized as directed to an internal DN. In this
scenario, all remote call features are available to the caller.
Figure 38 Calling into a remote node from a public location
Fallback to PSTN from VoIP trunks
Fallback is a feature that allows a call to progress when a VoIP trunk is
unavailable or is not providing adequate quality of service (QoS).
Refer to the information under Fallback to PSTN from VoIP trunks (page 190)
for details about setting up fallback for VoIP trunks.
By enabling Fallback to circuit-switched on the H323 Settings or SIP Settings
panels, you allow the system to check the availability of a VoIP trunk, then
switch the call to a PSTN line, if the VoIP trunk is not available. For the to work
on a suitable bandwidth, QoS monitor must be enabled and a transmit
threshold must be set. For QoS and transmit threshold settings refer to the
following table.
Use the dialing plan worksheet in the Programming Records to plan your
dialing requirements so you can pinpoint any dialing issues before you start
programming. If you are programming an existing system, you can look at
what numbers the users are familiar with dialing, and you can attempt to
accommodate this familiarity into your destination codes plan.
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