Change Dial out number ( 9) on Cisco UC 520 phone system

We have a Cisco uc520 phone system. The users use 9 before dialing out. We had some people that made a mistake and dialed out to 9 1 1 by mistake. Is there any way to change that to  7 or something else? Can that be done via CCA?

Also, we have a sip trunk ( XO T1)  and was wondering if we get simply get rid of the 9 all together. Our internal extensions are 3 digits and start with 200.  
Thank you,
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netcompAsked:
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José MéndezCommented:
I am not sure you can do that from CCA, as the dialplan tab will only provide 3 fields to input emergency numbers but won´t actually let you modify the behavior. You may easily transform 911 to something else by entering global config mode like this:

gw#conf t
gw(config)#num-exp 911  1234567

The second line expands to the 7 digit number on the right when 911 is matched. Let me know if that helps. You can always remove this instruction like this:

gw(config)# no num-exp 911  1234567
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netcompAuthor Commented:
Actually,
I don't want to change anything about calling 911, but want to change the number that is used to dial out. We now have to dial 9 before calling an external number. Can we change that to 7. Thank you,
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José MéndezCommented:
Have you tried from CCA, going to the dialplan tab and changing the Access Code from 9 to 7?
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netcompAuthor Commented:
No, I have not . I have to go onsite for that. I was asked if it was possible and I was not sure if it was possible or not? If not through CCA, would be doable from command line?
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José MéndezCommented:
yes but that would require analyzing the running dial plan and modify several dial peers probably.
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