James,
  Interesting idea about catching it in the dialplan/default context.  If
scanning persists then I might just add this.

Thanks,
David

On Sun, Mar 4, 2012 at 10:13 AM, James Babiak <ja...@routed.com> wrote:

> **
>
> 4) Configure your box with a script/program, or utilize the Asterisk
> dialplan, to function as a VoIP IDS/IPS system. This is what I do. If a
> call comes into the default context and goes to an invalid extension, it
> will immediately blacklist the host from being able to attempt to connect
> in the future. So unless the call comes in under one of the DIDs I own, or
> a pre-configured destination (ie: james@, conf@, etc.), the caller will
> be blacklisted.
>
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