Ethereal-users: Re: [Ethereal-users] RTCP for VoIP QoS

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From: Jaap Keuter <jaap.keuter@xxxxxxxxx>
Date: Fri, 24 Mar 2006 16:12:54 +0100 (CET)
Hi,

have you read RFC 3550? Chapter 6.4.1 talks aobout Sender Reports.

6.4.1 SR: Sender Report RTCP Packet

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
header |V=2|P|    RC   |   PT=SR=200   |             length            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                         SSRC of sender                        |
       +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
sender |              NTP timestamp, most significant word             |
info   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |             NTP timestamp, least significant word             |


MSW = most significant word
LSW = least significant word



On Fri, 24 Mar 2006, David Grau Serra wrote:

> Hi all list,
>
> My presentation: I am david grau and I am from barcelona. Excuses for my poor english.

You're doing oke.

> I know how can I calculate jitter and the packet loss rate.
>
> My problem now is how can I calculate delay (round trip delay).
> I don't understand why the "Delay since last SR timestamp" is always 1.
> I don't know how it works the "MSW" and "LSW" (Timestamp).

See above.

Thanx,
Jaap