The easiest way to stop this sort of thing is usually to ensure that your number plan is not ambiguous - e.g. if you dial 9 to route externally, allow CCM to send the 9 out with the number.
On your gateway, only one dial-peer pointing out to the SP would match the leading 9, and you would then strip that out with a translation pattern (as it's not a POTS peer this won't happen automagically).
Your inbound-to-CCM peer should then match non 9 numbers.
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