The main problem was in sangoma hardware echocanceler which has some noise filter. Sangoma today announced new drivers, which this filter turns off. I've tested it and fax are now going well.
Martin Vít wrote: > Hello, > > I'm testing 1.4.5 (no modifications) with E1 card and i've found problem. > > I've this scenaro > > FAX -> SIP - ATA -> asterisk -> E1 port A --loopback--> E1 port B --> > iaxmodem. > > > When jbenabled is off FAX is delivred OK. But when jbenable = on FAX are > failing in almost every line. I've compared WAV extracted from network > with WAV recorded (app monitor) before it gets to iaxmodem and there is > small differences. Network jitter is about 2ms (lab environment). > > Where could jitterbuffer modifies frames? I've tried to disable plc in > plc.c but without success. Any idea? > > thanks in advance > > _______________________________________________ > --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 > > -- Martin Vít LAM plus s.r.o. http://www.lam.cz/ Tel.: 605 267 610 _______________________________________________ --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
