Hello! Meanwhile, I tested several different versions of spandsp - but always the same problem. I tested another platform (for iaxmodem) - same behavior, too.
All tests are done with Asterisk 16.9.0 / pjsip. At first, let's concentrate on the inbound faxes. It's asterisk, which receives the fax on its own (no other tool involved). On 04.04.20 at 15:33 Michael Maier wrote: > Hello! > > I'm facing a massive problem during sending or receiving of fax (spandsp, > pjsip, > asterisk 16.9 bundled pjsip). Affected are always the packages sent by > asterisk. > The packages received are pretty perfect. > > Tracetool is pcapsipdump. > > Problem can't be seen that massive during "normal" (non) fax calls (maybe > just a > little bit). > > > What can be seen? > > Inbound fax: > - Fax passthrough (alaw) > - Fax received by asterisk > - no Jitterbuffer > - after about 1 minute of duration (> 6100 packages): > skew rises from +-0 to -30 (from one package to the > other) and all following packages afterwards have -19.9 > ms (one package seems to be just dropped without any > sequence error (sequence counter is ok)) > - Another 4000 packages later one more dropped package > (without sequence error) from -19.9 to -52 and > afterwards all following packages -39.9 ms (sampling > rate: 20 ms) -> exactly the same as before but from -19 > to - 40 ms. > - Duration: ~ 2 minutes > - always reproducible I found another way to demonstrate the problem: using Wiresharks I/O Graph in statistics (packets/second). Here you can see very well the problem: there are missing packets - but without any sequence error - they are just not created. Testcase here is a pretty short fax. The exactly same behavior can be found with longer faxes, too. You can find find two screenshots (2 examples) here: Example 1 [1] The red line represents the outbound packets/s. The green line are the incoming packet/s. Example 2 [2] The green line represents the outbound packets/s. The red line are the incoming packet/s. Thanks Kind regards Michael [1] https://www.bilder-upload.eu/bild-898820-1586108183.png.html [2] https://www.bilder-upload.eu/bild-eaf123-1586109449.png.html -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-dev mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-dev
