[Users] x-lite and nat_uac_test(16)

[Alexander Bergolth]

On 05/18/2007 05:21 PM, Andreas Granig wrote:
> Alexander,
>> 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? 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.
> 
> 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>

I did some further tests using X-Lite for Windows with interesting results:

TCP enabled:

- X-Lite binds to a source-port different from 5060 although 5060 is
available according to netstat.

- the port that shows up in the Via-header is different from the
source-port that is used for the TCP-connection

only UDP enabled on the server:

- X-Lite binds to a source-port different from 5060 although 5060 is
available according to netstat.

- the port that shows up in the Via-header is the correct source-port

- if there is a TCP-SRV record in DNS, it tries TCP first, falls back to
UDP after 19 seconds but uses "Via: SIP/2.0/TCP" instead of "Via:
SIP/2.0/UDP"

I'll file a bug-report, let's see what happens...

Cheers,
--leo
-- 
e-mail   ::: Alexander.Bergolth (at) wu-wien.ac.at
fax      ::: +43-1-31336-906050
location ::: Computer Center | Vienna University of Economics | Austria