Hello,
On 02.08.17 12:02, Yu Boot wrote: > Hello. I'm using almost default kamailio.cfg with nathelper, rtpproxy, > PSTN dialing and other default features. I have following scheme: > > FXS gateway -> (NAT) -> Kamailio -> FreeSwitch > > Voice calls work perfectly, no one-direction sound and so on. > > > But with fax machine there was a problem. In wireshark I saw UDPTL > from FS to Kamailio IP, and no UDPTL at all to FXS gw. I've guessed > that something's wrong with a re-INVITE request processing in > Kamailio. I've added this to WITHINDLG route: > > else if ( is_method("INVITE") ) { > record_route(); > > } > > And problem was magically solved, T.38 now works OK. Is this OK > solution or this may break something elsewhere? > a re-INVITE should be get record route re-enforced, so likely you deal with some broken CPE. Anyhow, doing the record_route() there should be harmless for the other CPEs, so can be taken as an easy fix. Cheers, Daniel -- Daniel-Constantin Mierla www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - www.asipto.com Kamailio World Conference - www.kamailioworld.com _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users