Hi, first of all you definitely do not want to put the contact received in the INVITE in the 200 OK, since you will, in the best case generate a loop of the UAC sending the ACK to itself. About having to call msg_apply_changes this comes probably by the fact that you've already manipulated the header with fix_nated_contact(). Due to kamailio's internals you cannot change the headers twice in a row without invoking msg_apply_changes(). For your main problem with the ACK, I'd rather look at the Record-Route. I see in the 200 OK that Record-Route has a private IP. Unless the caller is on the same network or on a network that can communicate with your server, you need to have there a public address (or a double Record-Route if your server is running on two interfaces). Have a look at "advertise" parameter of listen directive and to http://www.kamailio.org/docs/modules/devel/modules/rr.html#rr.p.enable_double_rr .
Best regards, Federico On Tue, Sep 25, 2018 at 12:24 AM Ben Hood <[email protected]> wrote: > > > On 24 Sep 2018, at 23:04, Alex Balashov <[email protected]> > wrote: > > > > On Mon, Sep 24, 2018 at 10:46:44PM +0100, Ben Hood wrote: > > > >> I was trying (as a temporary hack) to mangle this to become > >> > >> Contact: <sip:[email protected] > <sip:[email protected]>> > > > > But that's not grammatically valid… > > You are absolutely correct, but I don’t think that is what I wrote (might > be a typo from me?). I was trying to produce: > > Contact: <sip:[email protected]> > > Which I have now achieved by adding > > msg_apply_changes(); > > after the invocation of subst_hf(). > > Seems that the SIP buffer needs to be explicitly finalised before > transport. > > However, my theory about patching the Contact header to make the remote > system happy is wrong - the 200 OK is still not ACK’ed. So I need to look > into the NAT’ing a bit more to see what might be going on - but this is a > different question to how to use subst_hf(). > > Many thanks for helping me out with this, very much appreciated. > > > > > > > > _______________________________________________ > Kamailio (SER) - Users Mailing List > [email protected] > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >
_______________________________________________ Kamailio (SER) - Users Mailing List [email protected] https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
