[SR-Users] [NAT] BYE not received to caller

[Klaus Darilion]

The contact after fix_nated_contact() should also contain 
;transport=tcp. Thus, Kamailio should relay the BYE with TCP.

Can you show an ngrep dump (ngrep -W byline -t -q -P "" port 5060) of 
the problematic scenario?

regards
klaus

PS: A more standard-conform way of rewriting the SDP is to use the 
add_contact_alias() and handle_ruri_alias() functions:
http://sip-router.org/docbook/sip-router/branch/master/modules_k/nathelper/nathelper.html#id2601711

regards
klaus

Am 14.04.2010 12:06, schrieb Pascal Maugeri:
> Hi
>
> I need some "guidelines" to troubleshoot the following issue:
>
> a) A is behind NAT
>
> b) B is not behind NAT
>
> c) A calls B, SIP INVITE is sent over TCP
>
> d) A's firewall does NAT and changes the source port to let's say p1
>
> e) B releases the call and sends BYE over UDP
>
> f) Kamailio sends the BYE to A, over UDP, to the NATed source port p1 ?!
>
> 2 comments:
> - This scenario works perfectly when A is the one who disconnects the
> call. and of course when no NAT is involved everything works ok
> - if works when I comment the line "fix_nated_contact()" in the
> route[NAT] block:
>
> route[NAT]{
> #!ifdef WITH_NAT
>          force_rport();
>          #if (nat_uac_test("19")) {
>          if (nat_uac_test("3")) {
>                  if (method=="REGISTER") {
>                          setbflag(10);
>                          fix_nated_register();
>                  } else {
>                          #fix_nated_contact();
> [...]
>
> Any hint is very welcome.
>
> Cheers
> Pascal
>
>
>
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