VoIP Call MOS Audio
The estimated Mean Opinion Score (MOS), as determined by the E-model, has exceeded or (more typically) fallen below threshold.
Some possible reasons for this event:
Network congestion is causing delay, jitter, and resulting in packet loss and hence poor voice quality.
Link failure is causing packet loss and resulting in poor voice quality.
Route flapping is causing jitter and resulting in packet loss and poor voice quality.
Ethernet problems along the voice path (such as bad cables or interfaces) are causing packet loss and poor voice quality.