Sigma VoIP Guide - Part 4 - Post Dial Delay - PDD



Sigma VoIP Guide’s Part 4 is about the Post Dial Delay or PDD. What is the meaning of PPD and what are the consequences of this situations. Take a seat, coffee and let’s learn with us!

What is the meaning of PDD, Post Dial Delay? PDD is the time that before hearing ringtone. For example when you call someone whose cell phone is closed, PDD will be high. This situation is an unwanted situation in VoIP.

What are the consequences of high PDD? Avarage Success Rate of shortly ASR will be low in traffic. When PDD high, people won’t wait for call and they will close phone. Because the usual behavior of the people is closing the phone before hearing the ringtone.

What are the reasons for high PDD?

  • Destination:

Some destinations have high PDD values. For exampla fo Syria the PDD is around 9 sec and for Turkmenistan this valuse decrease to 3 sec. This PDD can change according to the traffic profile. We need to send the traffic first to direct to figure traffic profile. If the values are higher than what we define, we need to inform vendor.

  • Hop Excess

There will be a PDD difference between giving a traffic directly and above 6-7 different carrier. Because 6-7 carrier means sending calls above 6-7 different servers so it will increase the waiting time.

  • Provider Problem:

The provider can have some server or internet problems so it can effect the PDD rates.

  • Ncli Problem:

Some Ncli routes can use home internet so it can be slower and opening package times are slow. This situation can effect PDD values.

  • Loop Problem

If a call enters a loop, after 30-40 sec. it will end so the PDD will be high.

Do you have something to consult about VoIP? As a VoIP expert, Sigma Telecom is always open to your questions and problems. We could help you to find your way in VoIP ocean. We are looking forward to hear from you soon!

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