Summary:ASTERISK-01509: Poor sound quality
Reporter:iain (iain)Labels:
Date Opened:2004-04-30 07:08:38Date Closed:2008-01-15 14:52:55.000-0600
Versions:Frequency of
Description:Changes made in the past week have severely degraded the sound quality on *. Dropouts during calls (via X100P) and when playing MP3 have appeared that weren't present in earlier releases.  This applies both with Cisco 7960 and Grandstream endpoints.


Reducing load on the CPU (PPC G3) by killing X gives no improvement.  The Cisco 7960 is running on its own Ethernet segment and still shows the problem.  So I don't think this is CPU load related.
Comments:By: zoa (zoa) 2004-04-30 08:26:18

please tell us exactly how a call is being made ?

SIP to SIP ?
IAX2 To sip ?
trunked iax2 ?

If you are using trunked iax2, i also had bad quality since last week on 1 server, it turned out to be the trunking messages every x ms option in iax.conf causing it.
(suddenly that settings seems more important)

By: iain (iain) 2004-04-30 08:45:02

It's on SIP to PSTN and SIP to SIP (ie SIP phone to asterisk server).  

I have made an IAX2 call via IAXTEL in the past week and it was below par too.

By: Mark Spencer (markster) 2004-04-30 09:02:53

You're going to have to be more specific about what you're hearing.  Leave the mp3 out of the picture for the moment, too and focus on the x100p -> sip if you're still sure that you have a problem there.  You can use ethereal to look at the RTP packets and see if there is some issue with the timestamps.

By: iain (iain) 2004-04-30 09:40:19

I'm sure there's a problem with the X100P side.  All through the call there are short moments of silence that the coreespondent notices as well as I.  The frequency of these bursts of silence has increased significantly wuth the latest *.

I'm happy to run ethereal but I'd like a quick brief on what to look for in the timestamps.

By: Brian West (bkw918) 2004-04-30 11:05:02

Try app_playback  exten => 555,1,Playback(demo-congrats)

Bet it plays fine.  MP3Player isn't a good judge of sound quality.


By: Mark Spencer (markster) 2004-04-30 20:55:52

Find me on IRC.

By: Mark Spencer (markster) 2004-05-01 12:54:24

Incidently, I did some major improvements to the mp3 player application that should highly improve its audio performance with the new code.

By: Mark Spencer (markster) 2004-05-01 22:04:02

I've added a new tool called "zttest" that can measure the performance of your zaptel engine to try to determine if that's part of the problem.

By: Mark Spencer (markster) 2004-05-02 12:41:31

let me again express to you the importance of your responding in a timely fashion since this is a "major" bug which is holding up the release of asterisk 1.0 and 1.1 release candidates that we cannot reproduce.  if you want this bug to remain active, you must get back with us soon.

By: alric (alric) 2004-05-03 10:19:32

Reminder sent to iain

Have you attempted to contact Mark on IRC?  Do you have any update, or have you attempted to use zttest yet to see if it yields any results with this issue?

By: alric (alric) 2004-05-04 10:37:09

4 days without a response on a major bug, one that we are unable to reproduce ourselves.  I'm closing this bug for now.  If it is still an issue for you, find myself or another bug marshall, or follow the steps outlined here and contact Mark (kram) on IRC.

By: Digium Subversion (svnbot) 2008-01-15 14:52:55.000-0600

Repository: asterisk
Revision: 2840

U   trunk/apps/app_mp3.c
U   trunk/apps/app_nbscat.c

r2840 | markster | 2008-01-15 14:52:55 -0600 (Tue, 15 Jan 2008) | 2 lines

Improve mp3 player quality (bug ASTERISK-1509)