Avaya BCM 4.0 Networking Konfigurationsanleitung PDF herunterladen (Seite 408)

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408 Chapter 44 VoIP trunk gateways

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Figure 131 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 253.

How fallback routing works

CDP network: User dials 2233 (remote system DN: 2233; remote identifier/destination digit: 2).

The system absorbs the 8, no other digits are absorbed and the system dials out 2233.

If the call falls back to PSTN line, the system still only absorbs the 8. If the PSTN line is on a

private network, the system dials out 2233. If the PSTN line is a public line, the system dials out

the public access number to the remote system in front of the 2233. Refer to Figure 132.

IP network

PSTN

Public or Private

PSTN line

BCM

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