Avaya Business Communications Manager 5.0 - Planning and Engineering User Manual download pdf (Page 163)

Private networking–PRI call-by-call services 163

Nortel Business Communications Manager 5.0

Planning and Engineering

NN40170-200 01.03 Standard

August 2009

PRI call-by-call services

If Call-by-Call services were not used, each BCM system might have to be

equipped with the following trunks:

• 12 T1 DID lines needed to handle peak incoming call traffic

• eight T1 E&M lines needed to handle inter-office calls

• eight lines needed to handle outgoing public calls

The total required is thus 28 lines. If the BCM systems were using T1 trunks,

then two T1 spans would be required at each office. Note that the total of 28

lines represents the worst case value for line usage. In reality, the total number

of lines in use at any one time is generally less than 28. For example, during

periods of peak incoming call traffic, the demand for outgoing lines is low.

Benefits of call-by-call services

With PRI Call-by-Call services, it is not necessary to configure a fixed

allocation of trunks. Each of the 23 lines on the PRI can be used for DID,

private TIE, or outgoing public calls. This consolidation means that it may be

possible for each office to use a single PRI span, rather than two T1 spans.

With PRI Call-by-Call services, the only limitation is that there are no more

than 23 calls in progress at any one time.

The dialing plan at each BCM site is configured to determine the call type

based on the digits dialed by the user. If a user in Toronto wishes to dial a

colleague in New York, they dial the four-digit private DN (such as 6221). The

dialing plan recognizes this as a private network DN, and routes the call using

TIE service with a private dialing plan.

Incoming TIE calls are routed to telephones based on the digits received by

the network, which in this case is the four-digit private DN.

If a user in either location wishes to dial an external number, they dial 9,

followed by the number (such as 9-555-1212). The dialing plan recognizes this

as a public DN, and routes the call using Public service.

Incoming DID calls are routed to telephones, based on the trailing portion of

the digits received by the network. For example, if a public network user dials

an employee in the Toronto office, the network delivers digits 4167632221.

The BCM routes the call using the last four digits, 2221, to the BCM.

Refer to the following table for a description of the settings required for this

type of routing service.

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Avaya Business Communications Manager 5.0 - Planning and Engineering User Manual Page 163