Question

voip - pdd

Asked by: mysticaljoey

hi,

what does pdd stands for in voip term?

regards

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Asked On
2006-02-09 at 08:02:25ID21730272
Tags

pdd

,

voip

Topic

Voice Over IP

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: Heem14Posted on 2006-02-09 at 12:07:15ID: 15916063

post dial delay.

basically, once you dial the call, its the amount of time before it gets connected.

 

by: mysticaljoeyPosted on 2006-02-09 at 18:28:48ID: 15918969

hi,

say i set g711 as primary and g729 as secondary

but 10% of all my networks only support g711, so majority of my call will fail over to g729, correct ?

what will be the delay that i'm looking at?

 

by: grbladesPosted on 2006-02-10 at 03:05:20ID: 15920946

The only additional delay when the secondary is used instead of the primary codec will be the packet delay when the request for the primary is refused and the secondary request sent. This will depend on the speed of the network but should be less than 50ms (0.05 seconds) generally so insignificant.

 

by: mysticaljoeyPosted on 2006-02-15 at 19:58:12ID: 15968001

which will you prefer

pri 729 sec 723

or

pri 711 sec 729

 

by: grbladesPosted on 2006-02-16 at 00:17:43ID: 15968997

pri 711 sec 729
G711 is the highest bandwith codec and will give the best call quality. Uses about 80kbps bandwidth.
G729 is a good low bandwidth codec and uses about 25kbps bandwidth.
G723 is a very low bandwidth codec which uses about 20kbps bandwidth.

See http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080094ae2.shtml for a list of codecs and the bandwidth used by each.

Generally I would use the highest bandwidth (and therefore quality) codec that I can. If the speed of your internet connection is limited however then you may need to use a lower bandwidth codec so you can still support the number of simultaneous calls that you require.

20120131-EE-VQP-002

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