
Chapter 4 VoIP Trunk Configuration 67
IP Telephony Configuration Guide
Figure 33 VoIP schedule
7 Change Use Route to the route you configured for your VoIP line.
Configuring digits
For PSTN fallback to work, you must ensure that the digits the user dials will be the same
regardless of whether the call is going over the VoIP trunk or the PSTN. In many cases, this
involves configuring the system to add (inserting) or remove (absorbing) digits. For information of
inserting and absorbing digits, see the Business Communications Manager 2.5 Programming
Operations Guide.
For example: a caller dials 7 to access the VoIP line, 55 to select the remote gateway, and then 224
to dial a DN on the remote Business Communications Manager. The dialing plan must be set up so
that calls are treated the same way by the VoIP and PSTN routes. In the example above, dialing
755224 must access the same DN even if the call is routed across the PSTN and not through VoIP.
Activating the VoIP schedule
Before activating the VoIP schedule, calls using the destination code are routed over the PSTN.
This is because the system is set to use the ‘Normal’ schedule, which routes the call over the
PSTN.
Once the VoIP schedule is activated, calls are routed over the VoIP trunk.
The VoIP line must be activated from the control set for the schedule. For information about
control sets, see the Business Communications Manager 2.5 Programming Operations Guide.
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