Call setup observations are computed as one per call because only one call leg of the call contains the call setup data. Only calls originating from a Location are included in call setup measurements for that Location. The length of the call is not used to derive the value of the metric.
Calls originating from a voice gateway or the PSTN only compute post-dial delay.
Call setup availability observations are computed as one per call. The value for this metric is calculated as:
(# failed calls)/(total # of calls originated)
The number of call setup availability observations is equal to the total number of calls originated.
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