You can dial the outgoing trunk either through TAC or through access code. TAC would require the parameter on the trunk form "dial access" to be "y" .
However, you can also use Facility test to make the call provided you have the option to do that in COR. The procedure is simple You need to dial the facility test code followed by the trunk physical port no.(01a1106)where a=1, b=2.. At this step you'll get the network dialtone & you can continue with dialing the no. Note: The no. dialed thru facility test call would override all restriction & would not be reflected in the CDR....#-)
Hope this help.