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

[Callum Guy]

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 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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