AA-ISA integrates a third party MOS software stack to perform VoIP and video MOS measurements. This software provides:
call quality analysis using optimized ITU-T G.107
measurements of perceptual effects of burst packet loss and recency using ETSI TS 101 329-5 Annex E Extensions
measurements and analysis of RTCP XR (RFC3611) VoIP metrics payloads
AA software monitors the associated SDP channel and passes codec information (when available) to the subsystem which monitors VoIP. The video bearer channels traffic generates a wide variety of A/V performance metrics such as:
call quality metrics
listening and conversational quality MOS scores (MOS-LQ, MOS-CQ)
listening and conversational quality R-factors (R-LQ, R-CQ)
estimated PESQ scores (MOS-PQ)
separate R-factors for burst and gap conditions (R-Burst, R-Gap)
video MOS-V and audio MOS-A
video transmission quality (VSTQ)
video stream metrics
good and impaired I, B, P, SI, SP frame counts
automatic detection of GoP structure and other key video stream attributes such as image size, bit rate, codec type
transport (IP/RTP) metrics
packet loss rate, packet discard rate, burst/gap loss rates
packet delay variation/jitter
degradation factors (degradation because of loss, jitter, codec, delay, signal level, noise level, echo, recency)
When a flow terminates, AA software retrieves the flow MOS parameters from the subsystems, formats the info into a Cflowd record and forwards the record to a configured Cflowd collector (RAM).
RAM collects Cflowd records, summarizes these records using route of interest information (source/destinations). In addition, RAM provides the user with statistics (min/max/ avg values) for the different performance parameters that are summarized.