Re: [AVT] Handling lost marker packet in 2833bis

Tom,

The way that packet loss is detected is through the sequence number.
The missing M bit is another indication, but the primary indication is
the sequence number gap.

                                                        -- Steve

On Wed, 10 Nov 2004, Tom Taylor wrote:

> Kevin Noll had asked for advice in 2833bis on what to do if the initial packet of
> an event report (with the 'M' bit set) got lost but subsequent packets were
> received.  I did incorporate some advice in rfc2833bis-05, but it's probably a
> good idea to put it out to the list for consideration.  Here's what was added to
> rfc2833bis-05:
>
>     2.5.2.2  Playout of Tone Events
> ....
>        If a receiver receives an event packet for an event which it is not
>        currently playing out and the packet does not have the "M" bit set,
>        earlier packets for that event have evidently been lost.  The
>        receiver MAY determine on the basis of retained history and the
>        timestamp and event code of the current packet that it corresponds to
>        an event already played out and lapsed.  In that case further reports
>        for the event MUST be ignored, as indicated in the previous
>        paragraph.  If this is not so, the receiver MAY attempt to play the
>        event out to the complete duration indicated in the event report.
>        The appropriate behaviour will depend on the event type concerned,
>        and requires consideration of the relationship of the event to audio
>        media flows and whether correct event duration is essential to the
>        correct operation of the media session.
>
> --
> Tom Taylor
> Carrier VoIP Standards Development
> Nortel Networks
> Phone +1 613 763 1496  (ESN 393-1496)
> E-mail: taylor@nortelnetworks.com
>
> _______________________________________________
> Audio/Video Transport Working Group
> avt@ietf.org
> https://www1.ietf.org/mailman/listinfo/avt

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