Can't get second dial tone
As thiel2 stated, the 9N short code will send the call to the ARS table for any number including 90 so it is not necessary to add a second system short code. By doing so you are creating your own problem. The system is waiting to see if you will dial a 0 after the 9 and that is why you are not getting the second dial tone.
If you want to do something with 90 like send it to a busy signal or out a different trunk you can do this with a short code in the ARS table. It does not have to be a system short code.
Pete
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