[Serusers] Checking spoofed From headers

[samuel]

check_from() ?
2006/4/10, sip <sip at arcdiv.com>:
> Is there a way anyone can readily think of to check to see if someone using
> our open proxy is calling through with a From header that attempts to fool the
> recipient into thinking the call is validly from one of our users?
>
> Scenario is this...
>
> While looking at the logs this morning, I noticed someone was calling a
> SIPPhone user through our proxy with a From: address that LOOKED like it was a
> user of ours, but using a username that doesn't actually exist.
>
> I'm wondering if there's anyway to check if someone is calling through us with
> a From: address that looks like one of our users, but isn't.
>
> N.
>
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