Nortel BCM 3.7, Manual

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520 PRI networking using Call-by-Call services
N0008589 3.3
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 Business Communications Manager 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 numbering plan.
Incoming Tie calls are routed to telephones based on the digits received by the network, which in
this case will be 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 will be 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 will deliver digits 4167632221. The Business Communications Manager will
route the call using the last four digits, 2221.
Refer to the following table for a description of the settings required for this type of routing
service.
Table 114 PRI call-by-call services routing information
Parameter Home System Settings
Hardware
DTM PRI
Protocol NI-2
Trunk/Line Data
Line 245 Target line
Private/Public Received # 2221
Line Access
DN 2221 L245:Ring only
Line pool access Line pool PRI-A
Routing Services Private Network Public network
New York: Public network
Route 001 002
External # No number No number
Use Pool PRI-A Pool PRI-A
Service type Tie Public
ServiceID 1 N/A
DN type Private N/A
Destination Code 6 9
Normal route 001 002
Absorb 0 ALL