It is not necessary to put the * in front of the dialed US toll free number. Since SIPBroker's default (if you don't dial a prefix) is to route the call via ENUM, calls are terminated via one of the three partners on ENUM who have registered to handle toll free calls.
Don't believe me? I just tested it by dialing into SIPBroker's Anaheim, CA, access number and dialing 1-800-555-8355-#. In a few seconds I was greeted by TellMe's welcome message.
By not dialing * first, you will not bump into Sipura/Linksys' "Use RTP Encryption" feature code (*18).
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