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In simple situations, you can just add 911
to the Dial Patterns that will use this Route
on the default outbound route and specify the caller ID for the outbound trunk or route.
You will need:
911
dial pattern added/permitted/matched on the default outbound routeEmergency
flag on the default outbound routeWhen you have multiple locations, you will need:
911
dial pattern added/permitted/matched on the outbound route