Hello,

I have done some more detailed testing today and am still seeing the problem.  I am using Kamailio 3.1.3.

I added the following to the beginning of my route{ } section:

if (nat_uac_test(flags))
    xlog("NAT'd\n");

I then tested the following scenarios using X-Lite 4:
The REGISTERs (for TCP and UDP) sent by X-Lite were (with domain and user name obscured here):

REGISTER sip:example.com SIP/2.0
Via: SIP/2.0/TCP 192.168.0.187:15854;branch=z9hG4bK-d8754z-1c8ee3e957b12a9b-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:user@192.168.0.187:15854;rinstance=80c5894ae6e2ce6f;transport=TCP>
To: "User"<sip:user@example.com>
From: "User"<sip:user@example.com>;tag=da2c294e
Call-ID: NjA3YjNiNDdjZTgwNWVkYzZlOGRkZTU0NTkxNDlkZWQ.
CSeq: 1 REGISTER
Expires: 25
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
User-Agent: X-Lite 4 release 4.0 stamp 58832
Content-Length: 0

REGISTER sip:example.com SIP/2.0
Via: SIP/2.0/UDP 192.168.0.187:53264;branch=z9hG4bK-d8754z-a959b8f7e5f1e349-1---d8754z-;rport
Max-Forwards: 70
Contact: <sip:user@192.168.0.187:53264;rinstance=d601b2ea0398567c;transport=udp>
To: "Peter Dunkley"<sip:user@example.com>
From: "Peter Dunkley"<sip:user@example.com>;tag=753afc8a
Call-ID: NjBmZmFhNjEzNTFkZGZlMWQwNzdlZjlkYTE1OTc4ZGU.
CSeq: 1 REGISTER
Expires: 25
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
User-Agent: X-Lite 4 release 4.0 stamp 58832
Content-Length: 0

Regards,

Peter

On Mon, 2011-04-11 at 10:32 +0100, Peter Dunkley wrote:
I tried 63 (all), 55 (all but SDP), and 19 (from the sample configuration file).

I will try it again today.

Peter

On Sat, 2011-04-09 at 08:10 +0300, Juha Heinanen wrote: 
Peter Dunkley writes:

> nat_uac_test() doesn't seem to work for requests that arrive over UDP.

i don't know which param you tried, but nat_uac_test("2") and
nat_uac_test("1") works for me.

-- juha



-- 
Peter Dunkley
Technical Director
Crocodile RCS Ltd