also you can see that the difference between using 03 and 04 in the TRAF for the CAT (in NADAP) is because for example 03 does not allow 909 acess, but 04 does, so decide what you want for the user, should they dial 909 as well as 900? if yes, select Common Category for your extension with TRAF 3/4/5/6 = 0404, if no 909, then TRAF 3/4/5/6= 0303.
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