callSetupTime
The cumulative duration (in 100th's of a seconds) from an INVITE sent to receiving
the first backward 18x response on the egress leg. This value is nearly
identical on the ingress counter with any latency due to the time spent
for the SBC to send out the received 18x. If no 18x response is present,
the callSetupTime is the final 200 response (cumulative count).
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