Which two tools can be used to measure the quality of a VoIP call? (Choose two.)

A QoS configuration tool applies DSCP markings, queuing policies, and traffic shaping to prioritize voice traffic on the network but does not measure or score the quality of an active call.

The Mean Opinion Score (MOS) is an ITU-T P.800 standard numeric scale from 1 (bad) to 5 (excellent) that quantifies perceived voice quality by modeling the combined impact of codec choice, packet loss, delay, and jitter on the listener experience.

The Bulk Administration Tool (BAT) in CUCM is used for importing and provisioning large numbers of phones, users, and lines in bulk and has no capability to measure voice call quality.

A jitter buffer (jitter compensation) is an adaptive mechanism in endpoints and gateways that absorbs packet arrival variation to smooth playback and is a remediation technique, not a quality measurement tool.

The R-factor is produced by the ITU-T G.107 E-model algorithm and yields a score from 0 to 100, mathematically combining impairment factors including codec degradation, delay, echo, and packet loss to predict call quality without requiring subjective listener tests.