Unless you want to wait 10-15 seconds for every time you dial an extension, it is highly suggested to either not have any internal numbers beginning with the number 9, or change your access code.
Maybe you could prefix a number to all the internal '9' extensions?
But to fix the problem and wait for the interdigit timer, you go back onto all of your dial peers that have a destination pattern that have a 9 in them, and add a T to the end. Then on all of your CME extensions, you type 'number 9XXT', where the X is the rest of the extension.
This is bad dial-plan design, however.
-nick
