On 06/11/2017 at 01:29 PM Joshua Colp wrote: > On Sun, Jun 11, 2017, at 08:16 AM, Michael Maier wrote: > > <snip> > >> I did some further investigations and fixed a local problem. Now, >> asterisk is able to successfully activate T.38 - unfortunately just for >> very shot time because of a phantom package it receives! > > What was the local problem?
Update of t38modem from 3.13 to 3.15 >> Let's go into details: >> I'm starting at the point where asterisk / fax client receives the T.38 >> reininvite from the server from the provider 195.185.37.60:5060 for the >> fax client (extension 91): > > <snip> > >> >> But now, something strange happens: Asterisk "receives" a T.38 reinvite >> package from provider! >> Why is it strange? Because *this package doesn't exist at all* ! It >> can't be seen in tcpdump. I did 4 tests - always the same! Where does >> this package come from? It's exactly the same package which can be seen >> at the beginning of the trace excerpted here! Isn't it been deleted >> after it has been processed the first time? > > PJSIP uses a dispatch model. The request is queued up, acted on, and > then that's it. The act of acting on it removes it from the queue. That's the *expected* behavior ... . I rechecked again and again. All existing tcpdumps. The "resent" package isn't part of any tcpdump (wireshark doesn't show it) - and during tcpdump no package was dropped. > The > only reason I'd expect to see it again is if there was a retransmission > or something somehow requeued it up - but I don't think we do that > anywhere. Not quite sure why it would be happening... But even if this package would have really been sent (as retransmission) - shouldn't there be another response? T.38 has been successfully enabled before and the faxclient has already sent a valid 200 ok including complete SDP information to asterisk. All in all it looks really odd to me. Thanks, regards, Michael -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- Check out the new Asterisk community forum at: https://community.asterisk.org/ New to Asterisk? Start here: https://wiki.asterisk.org/wiki/display/AST/Getting+Started asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
