[SIPForum-discussion] Post Dialing Delay (PDD)

[Halit Sakca]

you are right for far end perspective we do not need a mirrored port BUT if we think about standardization of PDD we need to be sure about whole network health especially which will use 180 Ringing.  
rgrds,Selamlar,
Halit Sakca


From: HKaplan at acmepacket.com
To: sakcahalit at hotmail.com; mario.baron at ericsson.com; discussion at sipforum.org
Date: Fri, 18 Apr 2008 12:35:53 -0400
Subject: RE: [SIPForum-discussion] Post Dialing Delay (PDD)



















 

 













From:
discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Halit Sakca

Sent: Friday, April 18, 2008 11:43
AM



> Can Anyone help me how we can measure and verify that the PDD is under

> a certain value?

> 

> Is there any ITU-T value for the PDD to take as a reference?

> 

> Our NGN provides the IP connetivity to IP carriers through Acmepacket
SBCs.



For doing that mentioned above you will need a mirror port on switch anyway.

If you can not set the time of all components same via NTP and trace
separately.

 

No, you don’t need to do that
with mirroring – most SBC’s measure that time already and report it,
as do other SIP device types.  PDD can typically be fully measured at one
spot, although it may not represent the user’s perceived PDD if it’s
not measured at the originating provider.

Also, you don’t really need NTP,
because the number is a differential value measured by the same entity that
sends the INVITE request.  Thus the local view of global time does not really
matter. (it does matter for reporting/determining when calls are made, but not for
their delays or durations)

 

-hadriel









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