After i have researched both fields in ipcc report database( using document Schemadoc_722), i've found the following defintions:
DelayTime: The time in seconds that the call is active on the switch but not queued to a skill group or trunk resource.
NetQTime: the time in seconds the call spends in the router queue. Or in other terms it measures the time the call spends queued in the network VRU.
i can deduce from the above definitions that the delay time and netqtime overlap, however when calculating the call duration in Table TCD, both values are added
can someone please explain the confusion?
Actually according to the that definition the numbers shouldn't overlap. DelayTime is when the call is at the IVR but is not queued to any skill group, for example if you're playing an announcement or main menu before queuing the call. NetQTime applies only when the call is at the IVR and also queued to one or more skill groups. So DelayTime only ticks when the call is not queued, NetQTime only ticks when the call is queued, no overlap. Hope that clears it up.