Post-Dial Delay (PDD)

What is Post-Dial Delay (PDD)?

Post-Dial Delay (PDD) is the time interval between the end of dialing and the start of the call ringing. It is an important metric in telecommunication as it affects user experience.

Factors Affecting PDD:

• Network Latency: Delays in the transmission of signals across the network.
• Call Routing: The complexity and number of hops a call takes to reach the destination.
• Carrier Interconnections: Delays caused by the interconnection between different carriers.

How to Measure PDD:

PDD is measured from the moment the user finishes dialing until the called party's phone starts ringing. Lower PDD values indicate a more efficient and responsive network.

Why is PDD Important?

• User Experience: High PDD can lead to user frustration and abandoned calls.
• Service Quality: It is a key performance indicator for network quality and efficiency.

How to Reduce PDD:

• Optimize call routing paths.
• Minimize network latency through improved infrastructure.
• Ensure efficient interconnections between carriers.