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MGCP inbound calls

Hi, i'm running ccm 4.2 version with unity 4.0(5) as AA and Voice mail system; i have a cisco 2821 gateway with T1 CAS running mgcp. Outbound calls works fine, but with inbound calls users first receive an error message from unity (just as when you dial an unexisting extension)saying that this is not a valid station and then they receive the correct auto attendant message. I think i have a misconfiguration on the callmanager side: ony every port in the fields num digits and expextecd digits i have "10". The provider is sending me 10 digits, but if it prefix me the pilot number (809)xxxxxxx and use it as caller id dn and prefix dn on every port on the gateway its work well, i can not configure this way, because beside the pilot number i'll have DID running n the same T1.