This is a read-only gauge reporting the average total receive-side delay for this call, combining the playout FIFO delay with the decoder's own processing delay. An admin uses this as a single combined figure for how much delay the receiving end is adding to the call, complementing the network round-trip delay measurement to give a fuller latency picture. For example, an admin diagnosing overall call sluggishness would look at both this receive-delay figure and the round-trip delay to determine whether the lag is coming from the network path or from local receive-side buffering and decoding.