User > Telephony > Supervisor Settings check the box for "Outgoing Call Bar"
However it is poor form to block a phone from making emergency calls.
Assuming that you are dialing 9 for outbound calls, and 911 is your emergency number, DON'T check the box, on the User > Short Codes add 9N / N / Dial / 51:911 Only (a new ARS table that you will create), and then create 51:911 only with
11;
911
Dial Emergency
Outgoing Line Group
911
911
Dial Emergency
Outgoing Line Group
11N
<telephone number blank>
Barred
<Outgoing Line Group>
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