To Anebi in sipX 3.10 set the SBC to the OSBC's Public address and set the sipX gateways to the Termination ipaddre of the SIP Trunk (ST).
Who are you using for SIP Trunking? You will have to create 2 Gateways one for local calling within your Area code and 1 for long distance both pointing you your ST For local you will have ot put your areacode in the prefix "Dial Plan" This will add the areacode to your 7 digits local number because your ST provider does not understand "local" only DID(10). This is true wheater you your sipX is setting behind OSBC or is setting in a DMZ. usuall public with netmask /29.
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