VoIP R Factor by Call

The R-factor (as determined by the E-model) for a particular call exceeds or (more typically) has fallen beneath the threshold set in Expert Thresholds. Possible reasons for this event:

n	Network congestion is causing delay, jitter, and resulting in packet loss and hence poor voice quality.

n	Link failure is causing packet loss and resulting in poor voice quality.

n	Route flapping is causing jitter and resulting in packet loss and poor voice quality.

n	Ethernet problems along the voice path (such as bad cables or interfaces) are causing packet loss and poor voice quality.