
Chapter 5 Configuring VoIP trunks 81
IP Telephony Configuration Guide
3 The installer configures the media for the system, using the following settings:
• The first preferred codec is set to G.729.
• Silence Compression is turned on.
• Jitter Buffer is set to medium.
4 The installer puts the first eight VoIP lines into line pool O.
Any line pool can be used as long as all of the lines in the pool are VoIP. The installer does not
set an access code for the line 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 3321 to 3331), 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: 2
7 The installer sets up the VoIP schedule with these settings:
• Service: Manual
• Overflow: Y
8 The installer ensures a route has been created to the line pool that accesses the local PSTN
line, including the external # dialout.
9 The installer defines a new route called Route 003, and sets it to use PRI-A. This is the line
pool that contains the PRI fallback lines.
10 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.
Note: In this case, because the systems are on a CDP network, and the 2 is included in the
DN, this number will be absorbed before dialout.
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