Troubleshooting Sound Problems - pjsip.org

Troubleshooting problems in the audio quality is one of the most difficult task to do with PJMEDIA, because mostly it is system specific. This page will try to provide a step-by-step troubleshooting guide to assist solving such problems.

Understanding Media Flow

To better understand how audio media flows between media components in a call, lets use the following diagram:

​http://www.pjsip.org/images/media-flow.jpg

Types of Problems

There are tooo many audio quality problems than those mentioned below, but anyway lets try to enumerate them and present with some kind of troubleshooting guide:

No audio is heard on local speaker during the call

No Audio is Heard by Remote Party

Loud Static Noise

Brief Drop-Outs in Audio

One mailing list member reported this problem in this thread:

​http://www.pjsip.org/pipermail/pjsip/2006-November/001111.html

Quoting his email:

Does anyone else experience brief dropouts in audio? I can easily recreate this by playing a wave file to a channel that sends it to a local SIP server that just echos the result back. It's almost impossible to go more than a few seconds without extensive glitching and pops as the sound cuts out only to come back.

The solution that worked for him is to run the application in Release mode. Quoting his email again:

Seems one shouldn't use pjsip compiled in debug mode. (-g.) Going back to optimized cleared things up.

I'm sending tone in .WAV file from pjsua but got "stutters" on the remote side

One mailing list member tried to stream a .WAV file containing tone to X-Lite and SJPhone and observed audio "stutters" in the receiving side. But this didn't happen when the receiving side is another pjsua.

Solution: don't send tone file to these user agents, as it's suspected that they try to do something with the in-band tone. Use .WAV file containing usual speech and it should be okay.

High jitter value observed by remote party