Avaya BCM 4.0 Networking Guida di Configurazione Scaricare il pdf (Pagina 280)

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280 Chapter 24 Dialing plans

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When a user dials, and the telephone cannot capture the preferred line (First Route), the system

tries each successive defined route (Second Route, then Third Route). If none of these routes have

available lines, the call reverts to the Normal mode. When the call switches from the preferred

routing mode (First Route, Second Route, Third Route) to Normal mode, the telephone display

flashes an “expensive route” warning. VoIP trunking uses a similar process for setting up fallback

from the VoIP trunk to a PSTN line.

Setting up VoIP trunks for fallback

Fallback is a feature that allows a call to progress when a VoIP trunk is unavailable or is not

providing adequate quality of service (QoS).

Refer to “Setting up VoIP trunks for fallback” on page 429 for details about setting up fallback for

VoIP trunks.

By enabling PSTN fallback on the Local Gateway IP Interface panels for H.323 trunks, you allow

the call to switch to a PSTN line if the VoIP trunk is not available or cannot produce the expected

quality. To access the Local Gateway IP Interface panel, select Configuration > Resources >

Telephony Resources > IP Trunks.

You use scheduling and destination codes to allow the call to switch from H.323 line pools to a

PSTN line without requiring intervention by the user.

Use the dialing plan worksheet in the Programming Records to plan your dialing requirements so

you can pinpoint any dialing issues before you start programming. If you are programming an

existing system, you can look at what numbers the users are familiar with dialing, and you can

attempt to accommodate this familiarity into your destination codes plan.

Figure 89 shows how a fallback network would be set up between two sites.

Note: Overflow routing directs calls using alternate line pools. A call

can be affected by different line filters when it is handled by overflow

routing.

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Avaya BCM 4.0 Networking Guida di Configurazione Pagina 280

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