
60 Chapter 4 VoIP Trunk Configuration
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2 In the Configuration menu, select Add a new entry. The Remote Gateway window appears
Figure 24 Remote gateway dialog
3 In the Name field, type a name for the remote system.
4 In the Destination IP field, enter the IP address of the system.
5 In the Destination Digits field, set the leading digits which callers can dial to route calls
through the remote gateway. Ensure that there are no other remote gateways currently using
this combination of destination digits. If multiple leading digits map to the same remote
gateway, separate them with a space. For example, 7 81 9555.
6 Set the QoS monitor option. If you intend on using fallback to a PSTN line, set the QoS
monitor to enabled. Otherwise, set it to disabled. For information on enabled QoS, see
“Turning on QoS monitor” on page 68.
7 Click Save.
Configuring PSTN fallback
By enabling PSTN fallback, you allow the system to check the availability of suitable bandwidth
for a VoIP call. If the bandwidth is adequate, it connects the call across the VoIP line. If the
bandwidth is not adequate, it routes the call across the PSTN.
In a network configured for PSTN fallback, there are two connections between a Business
Communications Manager and a remote system. One connection is a VoIP trunk, the other is a T1,
BRI, PRI or analog line. When a user dials the destination code, the system checks first to see if
the connection between the two systems can support an appropriate level of QoS. If it can, the call
proceeds as normal. If the minimum acceptable level of QoS is not met, the call is routed over a
different route, commonly a PSTN.
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