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.

Thanks,

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Iskren Hadzhinedev