[Users] x-lite and nat_uac_test(16)

[Alexander 'Leo' Bergolth]

Hi!

On 05/18/2007 05:12 PM, Andreas Granig wrote:
> Alexander Bergolth wrote:
>> I've noticed that (at least on my boxes) x-lite uses a different
>> source-port for the sip-connection than the one that is announced in the
>> Via-header. (See the example below.)
> 
> Are you sure there isn't any NAT or ALG in between?

I've done the packet dump on both ends, on a box running x-lite (with
the windows-firewall disabled) and on the proxy-host. Both show the same
source/destination ip-adresses and ports, so I assume there cannot be
any kind of ALG.

However, there is some packet filter (not doing NAT) between the box and
the proxy, maybe x-lite does some firewall-detection on startup and uses
the wrong port-number in the via header intentionally to enforce the use
of an rtp-proxy?

I'll do some tests on a box that isn't protected by a packet filter on
Monday.

> By default, x-lite binds to local port 5060, but you've some
> non-standard ports in there. So my guess is either a non-standard
> port setting in x-lite and NAT, or a faulty ALG on the NAT device.

I don't have any special settings in X-Lite, ICE is disabled, "Use local
IP address" is enabled.

I've noticed that your version of x-lite uses UDP, mine seems to use TCP
by default.

Cheers,
--leo

> Here's a trace using x-lite 2.0 r1105d (Linux):
> 
> U 192.168.123.129:5060 -> <public IP>:5060
> REGISTER sip:<some domain> SIP/2.0.
> Via: SIP/2.0/UDP 192.168.123.129:5060;rport;branch=z9hG4<snip>
> 
> Cheers,
> Andreas


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