[asterisk-dev] Summary: SIP, NAT, security concerns, oh my!

Terry Wilson twilson at digium.com
Wed Nov 9 09:33:36 CST 2011

 > Method REGISTER? No known username in the From/To? => No answer.
> Method anything else? Not from a known IP+port? => No answer.

Of course, answering when we have a user and not answering when we don't makes it pretty easy to scan for usernames.

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