Out Call Routing Configuration
About Call Routing and 911 Calls
If you use Call Routing for 911, make sure that the default 911
route is configured to the route that can accept 911 calling
capability. Failing to do so may cause 911 direct dialing
failure. You can leave 911 default not configured, in which case you need
to let all extension users know that they need to dial 9+911 to call 911. It
might be a good idea to have them sign a 911 dialing disclaimer which state
that they understand and accept the 9+911 configuration.
126 AltiWare OE System Administration Manual