[Asterisk-Dev] Re: SIP SECURITY WARNING: v1-0 (cvs today) sip context in general section ignored goes to default instead - allowing unauthorized sip devices to place calls in default context

[Rich Adamson]

> > What do you do to protect the truly stupid, lazy, or the wonderful
> > combination of both?
> 
> You set up the default configuration files to accept all incoming
> requests into a context that, regardless of the attempted extension,
> answers by reading a voice message that explains that you need to
> follow the instructions in sip.conf and extensions.conf, telling you
> how to create a safe installation that will actually handle calls.
> 
> In sip.conf, there could be a comment, in the [general] section,
> explaining that the active "context=initial" setting is what gives
> this behavior, and naming a couple of other preconfigured contexts
> you can name instead to enable more functionality.

Or, just something very simple like John Todd's sample:
 context = bogon-calls   ; Send SIP callers that we don't know about here
  
and the same for iax.