Avaya BCM50 Konfigurationsanleitung PDF herunterladen (Seite 245)

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Chapter 24 Dialing plans 245

Networking Configuration Guide

Figure 73 PSTN fallback diagram

In a network configured for PSTN fallback, there are two connections between a BCM and a

remote system.

• One connection is a VoIP trunk connection through the IP network.

• The fallback line is a PSTN line, which can be the public lines or a dedicated T1, BRI, PRI or

analog line, to the far-end system.

When a user dials the destination code, the system checks first to see if the connection between the

two systems can support an appropriate level of QoS. If it can, the call proceeds as normal over the

VoIP trunk. If the minimum acceptable level of QoS is not met, the call is routed over the second

route, through the PSTN line.

For PSTN fallback to work, you must ensure that the digits the user dials will be the same

regardless of whether the call is going over the VoIP trunk or the PSTN. In many cases, this

involves configuring the system to add and/or absorb digits.

IP network

PSTN

BCM50 A

Public or Private

PSTN line

BCM50 B

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