[OpenSER-Users] OpenSER as NAT traversal proxy HELP!

[Joris Dobbelsteen]

Klaus Darilion wrote:
> Hi Joris!
> 
> Testing with XLite I meant to find out if the problem is a problem of 
> the ANT or of the client (zyxel) as Xlite does NAT traversal very well.
> 
> If Zyxel does not support NAT traversal and also voipbuster fails to 
> traverse your special NAT, then you yre right and need your own NAT 
> traversal solution e.g. as you tried with openser (multihomed)  and 
> rtpproxy in (bridge mode). You could also try 
> http://sourceforge.net/projects/siproxd/

I did, and with both I had several problems I have no knowledge of 
understanding what is going wrong and how to solve it.
With siproxd I got to the point that everything should have worked, at 
least in my opinion. I could see all the traffic flowing and it seemed 
to be OK and with correct IPs and correct ports. Either incoming or 
outgoing audio remained to be a problem, so after two and a half day I 
gave up and reconfigured the ZyXEL (plus other parts on the network) 
into the ISP intended configuration. This at least solved the VoIP 
issues I had.
Its not what I had intended though, but its a "production" system and it 
just needs to work. I had other people complaining, because VoIP was 
down mostly for 2 weeks while I was away.
It used to work before with plain NAT (most of the time) but something 
seems to have changed in the meanwhile (my ISP also had a few days 
outage on their VoIP service, so its well possible that they made big 
changes/replaced equipment to get them resolved). I only had problems 
with jitter at that time and I had resolved these.

Maybe I'll try again at some later date. In any case, OpenSER + rtpproxy 
don't seem to be really nice for the setup I thought about. NAT seems 
mostly an afterthought and I seriously miss control over the UTP ports 
to be used. I like to lock down my firewall as tight as possible, but 
this just not an option with this software. Its better with siproxd, 
where you actually can configure the UTP ports to use.
Nevertheless, its quite nice to see OpenSER a bit and I got an light 
impression of what it is capable of. The design allows you to do 
everything you could think of. The only other disadvantage is its 
unpolished support for postgresql, especially for someone who values 
ACID properties and MySQL lacks/violates those mostly. Still I should 
complement all the people who have designed and implemented this software.

Also thanks for those who tried to help me with my issues. Its at least 
encouraging for taking another attempt to get it to work at some later date.

Regards,

- Joris

[snip]