Avaya B5800 User Manual download pdf (Page 291)

Appendix C: Branch PSTN call routing

examples

Each B5800 Branch Gateway system can support its own external PSTN trunks. When deployed in an

Avaya Aura

network, you have considerable flexibility over where outgoing PSTN calls should emerge

from the network and similarly where incoming calls should be routed.

The following examples demonstrate some of the options available:

•

Centralized call control on page 291 — External calls at a branch site can be rerouted to be dialed

out at another site. This can be done for reasons of call cost and call control. For example, the central

site may have a bulk call tariff for national and international calls that would benefit all branches.

•

Branch PSTN Override on page 294 — Having configured the branch to send outgoing external

calls to the Avaya Aura

Session Manager for onward routing, there may be cases where a specific

number should still be routed via the branches own PSTN trunks.

•

PSTN trunk fallback on page 296 — The B5800 Branch Gateway can be configured to allow some

calls that would normally use the Avaya Aura

Session Manager line to be routed via the PSTN when

the Avaya Aura

Session Manager line is not available.

The various methods used in these examples can be combined to match the customer's needs. However

the main aim should be as follows:

• To keep the branch configuration as generic as possible, i.e. to use the same PSTN call control in

all branch configurations. This simplifies maintenance of multiple branches.

• To centralize as much of the PSTN call control in the Avaya Aura

Session Manager as possible.

Again this simplifies maintenance and control.

Centralized call control

External calls at a branch site can be rerouted to be dialed out at another site, typically the

headquarters site. This can be done for reasons of call cost and control and to reduce the

external PSTN capacity required at the individual branch sites.

For example, we can route all national and international calls to the headquarters site to benefit

from a bulk cost reduction available for calls from that site. The Avaya Aura

Session Manager

there routes the calls out via PSTN services at that site. Note, however, that the Avaya Aura

Session Manager could alternately use the trunks at a branch for some calls. For example, if

the national call is to an area code that is local to a particular branch, the call could be routed

to that branch for dialing on its PSTN trunks.

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Avaya B5800 User Manual Page 291