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2
Assign an overflow route, usually the most expensive route, to the same Destination Code, but
for the Normal schedule.
Figure 107 Configuring the Normal schedule for overflow
3
Under Scheduled Services, Routing Service, <preferred route schedule>, choose auto for
Service Setting, and Y for Overflow.
4
Use a control telephone to activate the feature on the telephones on which you want preferred
routing to be active.
Note: You must also ensure that the route correctly absorbs or passes dialed digits so that the
number dialed for each line is the same from the user perspective.
When a user dials, and the telephone cannot capture the preferred line (First Route), the system
tries each successive defined route (Second Route, then Third Route). If none of these routes have
available lines, the call reverts to the Normal mode. When the call switches from the preferred
routing mode (First Route, Second Route, Third Route), to Normal mode, the telephone display
flashes an "expensive route" warning.
Note: Overflow routing directs calls using alternate line pools. A call can be affected by different
line filters when it is handled by overflow routing.
VoIP trunking uses a similar process for setting up fallback from the VoIP trunk to a PSTN line.
Refer to the IP Telephony Configuration Guide for details.
Configuring destination codes with wild cards
Programming Operations Guide
349
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