Avaya B5800 User Manual download pdf (Page 294)

to those calls.

7. Click OK.

8. Select File > Save Configuration.

PSTN trunk fallback

In branch scenarios where centralized call control and trunking (see Centralized call control on

page 289) has been configured for certain calls, loss of the Avaya Aura

Session Manager line

connection will impact making those calls. For instance, in our example where all branch

national and international calls are routed via the headquarters site, loss of the Avaya Aura

Session Manager line will leave the branch users only able to make local calls.

Since loss of the Avaya Aura

Session Manager line should only be an infrequent and

temporary condition, some restriction during that state may be acceptable. However the

following options can be used to allow continued branch operation:

• If the headquarters site has multiple Avaya Aura

Session Managers for redundancy, each

branch can also be configured with multiple Avaya Aura

Session Manager lines. See

Avaya Aura Session Manager line redundancy on page 150 for more information.

• As in our example business, centralized call control has not been applied to all branch

local calls. Therefore local calls are still available without any additional configuration for

the loss of the Avaya Aura

Session Manager line connection.

• Since loss of the Avaya Aura

Session Manager line should be infrequent and temporary,

the loss of some services may be tolerable until the Avaya Aura

Session Manager line

issue is resolved. However, even if that is the case, it may be recommended to configure

Branch PSTN call routing examples

294 Implementing the Avaya B5800 Branch Gateway for an Avaya Aura

Configuration October 2012

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Avaya B5800 User Manual Page 294