I'm running into an issue where Freeswitch is sending out RTP with old/duplicate timestamps. 

A wireshark trace will show the something like the following randomly throughout a call:

Seq=19567, Time=26560

Seq=19568, Time=26880  <--

Seq=19569, Time=27040

Seq=19570, Time=26880  <--

Seq=19571, Time=27200

Seq=19572, Time=27360

Initially I thought this was related to vmware, but I am getting the same results on bare metal. Server load doesn't seem to matter. Server is a dual xeon with quad cores. Timer_test runs clean. I've tried setting <rewrite-rtp-timestamps> = true, but that didn't help. 

OS is Debian Jessie with FreeSWITCH (Version 1.6.19 -36-7a77e0b 64bit)

Any thoughts?

Thanks,

Konrad