How do you avoid mistaken 911 calls when 9 is used to get an outside line.

[Bryana012]

We use 9 for dialing an outside line and are getting too many accidental dialings of 911.  How have you mitigated this issue?

[Chris Deren]

Duplicate post: https://supportforums.cisco.com/discussion/12713096/how-do-you-avoid-mistaken-911-calls-when-9-used-get-outside-line#comment-10954681