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?
Thanks.
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