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