Round Trip Time or Round Trip Delay Time is the time it takes for a network request to go from a starting point to a destination and return back . The time is indicated in milliseconds. You can calculate Round Trip Time by using the following formula:

Round Trip Time = (T2–T1) — Delay Since Last Sender Report (DLSR), where

T2–T1 is the time between two RTP packets

DLSR is the time between receiving a sender report and sending a sender or receiver report to the receiver end. DLSR is a component of the Round Trip Delay Time that is not provided by the network.