
72 Chapter 4 VoIP Trunk Configuration
P0937663 02.0
• Private IP address: 10.10.5.1
• Public IP address: 47.62.84.1
• Phones 321-331
• From this system, dial 9 to get onto PSTN
On Business Communications Manager Ottawa
This procedure details actions that the installer performs to set up the Business Communications
Manager Ottawa.
1 The installer obtains keycodes for eight VoIP lines, and inputs the keycodes into the system.
Each Business Communications Manager has 10 phones, VoIP lines are available for eight
phones, but if all 10 phones try to place or receive VoIP calls at the same time, two of the calls
will be rerouted to the PSTN. The installer sets up 221 as the Control set for each line, so that
the VoIP schedule can be manually activated. This setup is necessary for PSTN fallback.
2 The installer sets the published IP address.
Because the public IP network is connected to the LAN 2 connection, the installer sets the
published IP address to LAN 2. This is the address that devices on the Packet Data Network
(PDN) will use to locate the system.
3 The installer configures the media for the system, using the following settings:
• The first preferred codec is set to G.729. The installer chooses this setting due to the
unique requirements of this installation.
• Silence Compression is turned on.
• Jitter Buffer is set to medium.
4 The installer puts 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 does not work with fallback. Instead, the line pool will be accessed
using destination digits after the installer sets up PSTN fallback.
5 For each telephone on the system (DNs 221 to 231), the installer gives the DN 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: 47.62.84.1 This is the published IP address of the Santa Clara Business
Communications Manager.
• QoS Monitor: Enabled This must be enabled for PSTN fallback to function.
• Transmit Threshold: 3.0 This is a Mean Opinion Score (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: 44 This means that callers dial ‘44’ to call phones on the Santa Clara
Business Communications Manager after dialing the destination digit.
7 The installer sets up a schedule called VoIP with these settings:
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