You can read in context here http://www.3cx.com/forums/categorie...general-1/international-call-forwarding-2461/. I don't know it this would be of any help to you. It is the closest 3CX can do at this time.If you have pre-determined numbers to call you can setup Digital Receptionist on line you will call in to 3CX, create extension numbers that are configured to "Forward All" to each external US number you specify, and setup the names in the DR Menu. So:
Call 3CX >> DR >> Select 1 for US Guy 1 >> Extension forwards to that number. You will have to create sub groups if you exceed the first menu option total (10). Remember that you will need at least one line in and another line out at same time, plus bandwidth to properly support, but will certainly work.
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