
74 Chapter 4 VoIP Trunk Configuration
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pool, because the access code would not work with fallback. Instead, the line pool will be
accessed using destination digits after the installer sets up PSTN fallback.
5 For each set on the system (DNs 321 to 331), the installer gives the set access to line pool O.
6 The installer sets up a remote gateway for the Santa Clara Business Communications Manager,
using the following settings:
• Destination IP: 47.62.54.1 This is the published IP address of the Ottawa Business
Communications Manager.
• QoS Monitor: Enabled This must be enabled for PSTN fallback to function.
• Transmit Threshold: 3.0 This is a MOS value that ensures that the VoIP lines are used as
long as the system can provide moderate quality.
• Receive Threshold: 3.0 This is a MOS value that ensures that the VoIP lines are used as
long as the system can provide moderate quality.
• Destination Digits: 55 This means that callers dial 55 to call phones on the Ottawa
Business Communications Manager after dialing the destination digit.
7 The installer sets up a schedule called VoIP with these settings:
• Service: Manual
• Overflow: Y
8 The installer defines a new route called Route 003, and sets it to use
PRI-A.
9 The installer defines a new route called Route 100, and sets it to use line pool O. This is the
line pool that contains the VoIP lines.
10 The installer creates a destination code of 7.
• Under the Normal schedule, the installer assigns Route 003, which uses PRI-A.
• Under the VoIP schedule the installer assigns Route 100, which uses the VoIP lines in line
pool O.
11 The installer configures the call digits. They must be configured so that calls will still be
processed correctly if routed over PSTN. For information about configuring dialing plans, see
the Business Communications Manager 2.5 Programming Operations Guide.
12 The installer dials Feature 873 and selects the VoIP schedule. VoIP is now activated. At this
point, the system is configured to make outgoing calls, but it is not set up to receive incoming
calls.
13 The installer programs target line 241 with the received digits 321, then assigns this target line
to DN 321. This means that calls received containing the digits 321 are delivered to DN 321.
The installer repeats this procedure for each telephone using different received digits and
target lines.
Making calls
From a set on Business Communications Manager Ottawa, a caller dialling a set on Business
Communications Manager Santa Clara must dial the destination code, the destination digits for the
Business Communications Manager Santa Clara remote gateway and the DN of the set. For
example, dialing 744322 would connect as follows:
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