[OpenSIPS-Users] Block lookups for WebRTC DNS .invalid

[Bogdan-Andrei Iancu]

Hi,

There was a similar email couple of days ago - the idea is to do 
fix_nated_contact() for all the traffic (replies and requests) coming 
from the WS(S) end point (as such endpoints are not able to provide a 
routable contact)

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS Summit 2019
   https://www.opensips.org/events/Summit-2019Amsterdam/

On 06/12/2019 12:08 PM, Callum Guy wrote:
> Hi All,
>
> I am in the process of configuring a WebRTC/SIP proxy and wanted to 
> know if there was any way to prevent OpenSIPs from attempting to 
> resolve the .invalid domains present in the Via headers:
>
> INVITE sip:abc at us.net <mailto:sip%3Aabc at us.net> SIP/2.0
> Via: SIP/2.0/WSS b7evbq9f9q22.invalid;branch=z9hG4bK5495466
>
> Although all is working I'm seeing the following log message.
>
> CRITICAL:core:mk_proxy: could not resolve hostname: "b7evbq9f9q22.invalid"
>
> Certainly it seems that this is compliant with the RFC defined 
> behaviour (https://tools.ietf.org/html/rfc7118#appendix-B.1) however I 
> am hoping there is a simple way to block lookups to this domain to 
> save resources etc.
>
> On a side note I am typically reviewing SIP on our network using 
> sngrep, when relaying these messages over UDP sngrep is failing to 
> read the packets (presumably due to the extremely large SDP failing 
> reassembly). While I'm writing I wondered if anyone has seen this 
> before and could offer advice - the target endpoint (FreeSWITCH) has 
> no issues reading it. One workaround could be to use TCP (tested and 
> works) however I was curious if there was another solution?
>
> Thanks,
>
> Callum
>
>
>
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