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120 Chapter 6 Setting up VoIP trunks for outgoing calls

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How fallback routing works

CDP network: User dials 82233 (remote system DN: 2233; remote identifier/destination digit: 2).

The system absorbs the 8 and 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 38 and Figure

39.

Figure 38 Setting up routes and fallback for call to remote system (CDP dialing code)

VoIP routing

Fallback to PSTN routing

Public network

Note: For this example, the destination code to call inside the other system is 82

Both systems have destination code 9 set up as the local PSTN access code.

Create route to VoIP pool:

Route: XXA (VoIP pool)

No external #

DN type: Private

Create route to PSTN pool:

Route: XXB (PSTN line pool)

External #: <public#to remote>

DN type: Public

Assign VOIP sched

under destination code:

First route: XXA

Absorb length: 1

Assign Normal sched under

destination code:

Use route: XXB

Absorb length:1

System grabs VoIP pool

and dials out: 2233

System grabs PSTN line pool

and dials out:

<public#to remote>2233

Call to person within remote BCM system.

User dials DN, which includes the destination code

Example: 82233

System dialout to remote system

Destination code 82 schedules

If fallback occurs

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Avaya IP Telephony Guía de configuración Pagina 120