[Freeswitch-users] In-call artifacts with PCMA/PCMU

Michael Jerris mike at jerris.com
Tue Oct 14 18:03:32 MSD 2014

is there even any transcoding involved in your scenario?  Are the artifacts present in the inbound stream as well.  I would get a tcpdump and analyze the inbound and outbound streams to see a bit more detail of what is going on.


On Oct 14, 2014, at 5:12 AM, Iskren Hadzhinedev <iskren.hadzhinedev at ikiji.com> wrote:

> Hi everyone,
> Some of the calls using PCMA/PCMU have artifacts (distorted sound, “robotic” voice, stutter) on what looks like a random basis. The other codecs I have tried don’t have issues (tried GSM, iLBC,G722, G729, SILK). Apart from FreeSWITCH, the only other thing running on the machine is a static webpage served by nginx and the load is almost always at 0. Any help or advise on how to chase down this issue is highly appreciated!
> System specs:
> Machine: Xen VM
> RAM: 1GB
> CPU: Dualcore 2.4 Ghz 64bit
> OS: CentOS 6.5
> FreeSWITCH Version: 1.5.13b+git~20140621T003222Z~47891d5caa~64bit
> Max # simultaneous calls: 12
> Calls per second: at most 3
> Endpoints used for testing:
> Hardware phones: Yealink T42G, Yealink T48G, Gigaset DE900, Cisco 7975 (with SIP firmware)
> Softphones: CounterPath Bria for Android, CsipSimple (android), Linphone, Jitsi
> Mobile provider and a landline via gateway.
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