PDD, or Pre Dial Delay, is a measure of the time it takes for a Voice over Internet Protocol (VoIP) call to be established after a user initiates the call. It is the time elapsed between when the user dials the phone number and when the first provisioning response is received. A good quality VoIP route should have a PDD of less than five seconds. This means that the call should be connected within five seconds of the user dialing the phone number. The PDD is an important metric for VoIP service providers because it impacts the user experience. If the PDD is too high, it can cause frustration for users who have to wait a long time for their calls to be connected. On the other hand, a low PDD ensures that calls are connected quickly and efficiently, which can improve the overall user experience. There are a number of factors that can affect the PDD of a VoIP route, including the quality of the Internet connection, the hardware and software being used, and the routing of the call through ...