The x-axis indicates the time when the call occurred in a time interval.
The y-axis shows counts of Stable and New calls. The count is an absolute value and summed over a predefined time interval (default = 15 minutes):
Sum of all established calls in the system at the end of the monitored interval.
Sum of all in SIP_Invites divided by two (1/2 Σ SIP_Invites)
What to look for:
Unusual Drop in stable callsNote:
Unusual Change in new calls
With an average call duration of 3 minutes, 5 new calls in a 15 minute interval typically results in 1 stable call at the end of the 15 minute interval.
Parent topic: Types of Graphs