Hi! > How to generate jitter from PJSIP sender side? I would like to add random jitter (from 0 to 10ms) from sender perspective. > is it any possibility to do that without hacking code? Have a look at: http://www.linuxfoundation.org/collaborate/workgroups/networking/netem Others used also used netem to test the asterisk jitterbuffer: https://reviewboard.asterisk.org/r/144/ It would be nice to hear something about your results, since I am affraid that I have to look into jitter issues myself in the future. Best Regards J?rg Schwarzenberg