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. Mike On Oct 14, 2014, at 5:12 AM, Iskren Hadzhinedev <iskren.hadzhinedev@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.