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Chapter 2 System telephony networking overview
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PRI networking using Call-by-Call services
The example shown in Figure 5 highlights the use of PRI Call-by-Call services. It shows two
offices of a company, one in New York and one in Toronto. Each office is equipped with a BCM
system and a PRI line. Each office has to handle incoming and outgoing calls to the public
network. In addition, employees at each office often have to call colleagues in the other office.
Refer to “Private networking: PRI Call-by-Call services” on page 383 for more information.
Figure 5 PRI networking using Call-by-Call Services
New York office
Toronto office
Network # 2221
Received # 2221
Internal # 2221
DID # 763-2221
Network # 6221
Received # 6221
Internal # 6221
DID # 562-6221
BCM
PRI
Central
Office
BCM
TIE Connection
PRI
Central
Office
Public Network
To reduce long distance costs, and to allow for a coordinated dialing plan between the offices,
private lines are used to handle inter-office traffic.
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
PRI SL-1/Q.Sig/DPNSS and VoIP trunk networking
PRI SL-1 trunks and VoIP trunks can be used to create private networks between BCM systems or
between BCM systems and larger call servers such as Meridian 1, Succession 1000/M, DMS100/
250 and CSE.
ETSI-QSIG and DPNSS private networking is configured very similarly, although network
features may be supported slightly differently due to local line and network requirements.
BCM 4.0 Networking Configuration Guide