Create an incoming call route for each emergency phone
Incoming Number: *
Incoming CLI: {the telephone number that the emergency phone is calling from}
Tag: {Description of the Emergency phone's location}
Destination: A new hunt group called Emergency Phones
Add the users that will be answering the emergency phones to the group "Emergency Phones", make it Collective Call Waiting
Give each User a Group button for the group
When an emergency phone calls in, no matter what DID it is dialing, it will match the incoming call route with its CLI, go to the group called Emergency Phones. The Users will ring, the Group button will flash, the display will show the Tag with the location on the top line, and the incoming caller ID>Emergency Phones on the 2nd line