When should autoVoIP show QoS information – R and MOS values?
The autoVoIP system will calculate QoS if:- • It has monitored QoS information in RTCP packets Note: Just because you have RTCP frames being monitored by autoVoIP, it does not mean they contain QoS information, for example they may just be SDES or BYE RTCP frames, which do not contain QoS. The RR (Receiver Report) is used to primarily report QoS using the Fraction lost field. Delay is measured using the DLSR (Delay since last Sender Report) field in the Receiver Report. So both RR and SR frames are needed to measure delay. The fields in the Receiver Report must contain valid information, i.e., not zeros or incorrectly formatted timestamps. Sender Report frames on their own will not provide QoS information. If both valid SR and RR frames are monitored the “R” values are more accurate as “Delay” is also used to determine QoS.
