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Wireshark-users: Re: [Wireshark-users] RTCP: Calculate round trip delay

From: "Anders Broman \(AL/EAB\)" <anders.broman@xxxxxxxxxxxx>
Date: Mon, 5 Mar 2007 16:43:13 +0100
Hi,
When you look at the RTP timestamps do the come up as correct NTP timestamps?
It's not uncommon for clients to fill in the timestamp incorrectly.
Best regards
Anders

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Skickat: må 2007-03-05 09:06
Till: wireshark-users@xxxxxxxxxxxxx
Ämne: [Wireshark-users] RTCP: Calculate round trip delay



Hi all!

   I am working on RTCP protocol. I would like to know how to calculate
the round-trip-delay for an SSRC.
I know that it can be calculated using the formula

Round trip delay = Arrival time- Last Sender Report Timestamp - Delay
since Last Sender Report Timestamp

But I guess the units of Arrival time and the LSR (and DLSR) are
different. I use the arrival time as given by Wireshark.
I get some weird answers when I subtract the LSR and DLSR from the
arrival time.

Can anybody tell me how to go about the problem?

Thanks in advance.


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