Avaya BCM50 Konfigurationsanleitung PDF herunterladen (Seite 374)

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374 Chapter 43 VoIP trunk gateways

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On any IP gateway for which you want to allow fallback based on network quality, you need to

ensure that QoS monitor is enabled.

Describing a fallback network

Figure 114 shows how a fallback network would be set up between two sites.

Figure 114 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 other 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 enabled). 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.

In many cases, this involves configuring the system to add and/or absorb digits.

For detailed information about inserting and absorbing digits, see “Dialing plans” on page 217.

Warning: QoS monitor must be turned on at both endpoints. To enable the QoS Monitor

select Configuration > Resources > Telephony Resources > IP Trunks > Routing

Table panel.

IP network

PSTN

BCM50 B

BCM50 A

Public or Private

PSTN line

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