[VoIP] SIP/firewall problem - the saga

[Chad Perkins]

> > > My asterisk box is NATted behind an IP-COP linux firewall.  I have
> > > port 5060 forwarded to my asterisk box, but the RTP ports are just
> > > opened up -- not forwarded anywhere.
> > 
> > I'm confused as to how the RTP knows where to go if not forwarded. 
> > Is Asterisk on an "Orange" DMZ port?  Atleast IP-Cop should have
> > some logs that help with this
> > sort of thing.  Too many COTS firewall/routers have zipo.  :(
> 
> Yes, it is.  My desktop PCs are in the Green Zone, and my servers are
> in the DMZ (orange interface).
> 
> Biggest thing, though, is that I double checked my port forwarding,
> and see that I have ports 10000-20000 UDP forwarded to the Asterisk
> box. So, I stand corrected.  

That makes sense.

> And this will show a certain amount of network ignorance on my part,
> but, is RTP UDP? Or is it its own animal?

Yes, check out http://en.wikipedia.org/wiki/Real-time_Transport_Protocol
short and sweet (cough, cough)...

Chad