As guessed before, you are using forward() in your config, which does stateless
forwarding, next is the part of the config showing it:
```
...
request_route {
# per request initial checks
route(REQINIT);
# NAT detection
route(NATDETECT);
t_check_trans();
if ( method=="INVITE" ) {
ds_select_dst("1","4");
sl_send_reply("100","Trying");
forward();
exit();
}
...
```
You have to use t_relay() instead of forward() for stateful routing, if you want to work
on top of default kamailio.cfg. Otherwise, you have to add a logic to ensure that CANCEL
is sent to the same destination as INVITE.
Also, the place in config where you do the routing for INVITE is not really a good one,
re-INVITEs being misrouted.
Anyhow, this is not an issue of kamailio code, but the configuration file. You have to use
sr-users(a)lists.kamailio.org mailing list for sorting out issue with kamailio.cfg.
Closing this one.
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