Posted: Thu May 21, 2009 8:08 pm Post subject: [asterisk-users] Monitor problem, Asterisk 1.2.13
Hi guys,
I'm running Asterisk 1.2.13 on a Debian Linux system (that was just the
version that was packaged for it). I've been using monitor() to record
calls, with fairly satisfactory results - at least until the last few
months.
I've been recording VoIP calls, and using monitor() with no arguments, so
I'm getting separate wav files for each leg (both use ALAW, BTW), and
combining them with soxmix, which apparently does support ALAW (if I'm
right in presuming the wav files would be in this format - I'm no expert
on such things). I'm then using mplayer to listen to them.
However, I'm finding that the two legs of the call often get quite badly
out of sync, so much so that I've often heard the answer to a question
come before the question itself in a recording, when it certainly didn't
happen like that at the time! In one such instance, the in-file and
out-file also differed in length by some 30 seconds, while being nearly an
hour long each; they were perfectly in sync right at the beginning of the
call, but already quite badly out by only 6 minutes in.
I'm pretty stumped here; I can only imagine that, for some reason, not all
silence is being recorded in the sound files, so that, when there's
silence on one leg and voice on the other, they become uncoordinated. I'm
puzzled as to why this wasn't a problem previously, though; I suspect it
was before I was using SIP for VoIP, so, in that case, in the previous
(working) case, one leg was IAX while the other was SIP, while now, both
are SIP. Canreinvite is set to no, however, so I didn't think this would
be an issue. It is possible, however, that it was a problem before, but
that I failed to notice it, or perhaps it triggered less often for some
other reason.
any thoughts appreciated!
BTW, I'm blind, which partly limits my choice of applications (I've been
using console based ones, as I haven't worked out how to use X).
Best wishes,
Nikhil.
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Posted: Thu May 21, 2009 11:12 pm Post subject: [asterisk-users] Monitor problem, Asterisk 1.2.13
Hi Nikhil,
Several of these "out of sync" issues have been resolves in many recent versions
of Asterisk. I'm not sure if many of the out of sync issues were reported
against 1.2 when it was receiving bug updates, so you may need to move to
Asterisk 1.4 in order to get these updates.
Additionally, I'm not sure which version is better for your reading software,
but there is a web based version of the Asterisk book at
http://astbook.asteriskdocs.org or you can grab the PDF fro
http://www.asteriskdocs.org (if you need help compiling a newer version of
Asterisk).
Hope that helps!
Leif.
Nikhil Nair wrote:
Quote:
However, I'm finding that the two legs of the call often get quite badly
out of sync, so much so that I've often heard the answer to a question
come before the question itself in a recording, when it certainly didn't
happen like that at the time! In one such instance, the in-file and
out-file also differed in length by some 30 seconds, while being nearly an
hour long each; they were perfectly in sync right at the beginning of the
call, but already quite badly out by only 6 minutes in.
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