We have seen one encrypt the Contact username in 200 OKs.
> -----Original Message-----
> From: Henning Schulzrinne [mailto:[EMAIL PROTECTED]]
> Sent: Friday, December 20, 2002 3:48 PM
> To: [EMAIL PROTECTED]
> Subject: [Sip-implementors] HTTP transparent proxy or
> HTTP-inspecting firewall blocking SIP?
>
>
> We have found a firewall or transparent proxy that seems to
> selectively
> block SIP 200 responses on TCP connections. All other SIP
> requests and
> responses go through, but the 200 gets blocked. One far-fetched
> suspicion is that the proxy or firewall checks for HTTP responses and
> then gets confused by the similar-looking 200 OK response
> (but ignores
> the other non-2xx responses since those would be useless for caching).
>
> Does anybody know of such a beast?
>
> Henning
> Schulzrinne
>
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