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...l is passed to extensions.conf into the correct context (specified earlier in your sip.conf) then the dial match will start with this extension. This item is optional, and if left out will use the "user" parameter for matching (I think...) So, a few examples: register => 3992@dumbserver.blah.com This registers user 3992 with dumbserver.blah.com, with no password, and inbound calls from dumbserver.blah.com on extension 3992 will go to extensions.conf and try to match 3992 as the "dialed extension". The SIP system on dumbserver.blah.com doesn't care that you'...