[Firehol-support] VOIP with SIP/RTP and firehol stateful firewall

Redeeman redeeman at metanurb.dk
Tue Feb 19 11:49:24 GMT 2008

On Tue, 2008-02-19 at 05:51 +0100, Andreas Unterkircher wrote:
> > I have been told from a person i know, that voip with sip/rtp wont work
> > properly with a stateful firewall on the router.
> It's a bit like FTP. You have one signaling channel (SIP) and then the 
> channel for your voice (RTP). As the RTP stream got established between 
> randomly selected ports, iptables may have problems with it, if you have 
> a very strict ruleset.
> But there for now ip_conntrack_sip exist (already in the mainstream 
> kernel). Afterwards you only need to allow SIP in your firewall.

Nice! do i need to do anything special to use this module?

> Cheers,
> Andreas
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