Avaya BCM 4.0 Networking Guide de configuration télécharger pdf (Page 44)

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44 Chapter 2 System telephony networking overview

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Tandem calling to a remote PSTN

A system connected to a private network that uses dedicated circuits or VoIP circuits can allow a

user to dial directly to many other users, on different nodes, using a coordinating dialing plan.

Using a private network saves on toll charges, and local charges, as fewer PSTN accesses are

required for internal and external calling. Several nodes located on one site initiate their external

local calls to a centralized BCM having a T1 termination to the PSTN. This type of configuration

avoids multiple PSTN terminations at other local nodes.

The same tandeming concepts can be applied to inbound calls. DID numbers dialed from the

PSTN can be processed and tandem routed out of the centralized system to the localized remote

nodes. See other details on Tandem routing “Creating tandem private networks” on page 50.

Figure 3 Tandem dialing through a BCM to/from a private network

In the above example, there are three types of callers.

Each type of caller has a specific method of accessing the other two systems.

Callers using BCM

These callers can:

• call directly to a specific telephone

• select an outgoing line to access a private network

• select an outgoing line to access features that are available on the private network

• select an outgoing central office line to access the public network

• use all of the BCM features

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Avaya BCM 4.0 Networking Guide de configuration Page 44

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