Hi I tried to activate rtcp_xr and after the call is disconnected I call pjsua_call_dump(..). When doing some calculations inside pjmedia_rtcp_build_rtcp_xr(..) the c13 value is 0 leading to a crash on the line below. This is only FYI, I do not need this value and maybe there is some prereq in my kind of call that is not fullfilled in order to actually calculate the XR values. I just wanted to inform you about the crash in case there is room for improvments. /* Calculate burst and gap durations in ms */ sess->stat.rx.voip_mtc.gap_dur = (pj_uint16_t)((c11+c14+c13)*m/c13); The values when entering the /* Voip Metrics Block */ are: pj_uint32_t c11 = 112 pj_uint32_t c13 = 0 pj_uint32_t c14 = 2 pj_uint32_t c22 = 2 pj_uint32_t c23 = 1 pj_uint32_t c31 = 0 pj_uint32_t c32 = 1 pj_uint32_t c33 = 0 Best Regards Johan