Artifex Maximus wrote:
Everything is fine when caller use ECM but when ECM isn't in use I
often got unusable incoming faxes (much often that it should be). But
when I switch back to fax machine that receive faxes perfectly (at
least no visible error).
The fax machine itself uses ECM, undoubtedly. If callers that have
quality problems with IAXmodem+HylaFAX don't have problems with the fax
machine, then that strongly indicates that something is wrong with your
Asterisk setup... corrupting the audio. Usually this is due to resource
constriction of the Zap device, zttest scores less than 99.98% is
indicative of that situation.
Where should be the problem? Is there any solution for improving
quality? Any tuning in Asterisk or Hylafax? As I see some people use
slinear for iaxmodem and some user use alaw. Which is better?
There is no functional difference between using uLaw, alaw, or
slinear... except that using slinear reduces the need for conversion...
and thus possibly lessens CPU usage very slightly.
Lee.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --
asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-users
