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80 Chapter 5 Configuring VoIP trunks

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Configuring PSTN fallback

By enabling PSTN fallback, you allow the system to check the availability of suitable bandwidth

for a VoIP call, then switch the call to a land line if the IP line is not available or cannot produce

the expected quality. The following figure shows how a fallback network would be set up between

two sites.

Figure 21 PSTN fallback diagram

Gateway Protocol None

SL-1

CSE

Select the gateway protocol that the trunk expects to use.

None: No special features

SL-1: MCDN protocol for gateways that provide MCDN over VoIP

service

CSE: Use this setting when using a CSE 1000 gateway.

Destination Digits <numeric>

(could be the same

as the destination

code for the route

to this system)

Set the leading digits which callers can dial to route calls through the

remote gateway. Ensure that there are no other remote gateways

currently using this combination of destination digits.

If multiple leading digits map to the same remote gateway, separate

them with a space. For example, 7 81 9555.

These numbers are passed to the remote system as part of the

dialed number.

Table 17 Remote gateway record (Continued)

Field Value Description

Business

Business Communications

IP network

PSTN

Manager B

Communications

Manager A

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 179 180

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Avaya IP Telephony Guía de configuración Pagina 80