2 Aug
2017
2 Aug
'17
7:24 a.m.
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
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