Re: [AVT] RFC2833(bis): Duration = 0

[Henning Schulzrinne <hgs@cs.columbia.edu>]

As indicated, this should only occur for states, not regular tones, such 
as DTMF. This is not defined for tone packets; I will make a note of it. 
(I don't think you want this for tone packets, following the soft-state 
principle.)

Prabhu, Raghavendra wrote:

> Hi listeners,
>
> The draft says
>
>              The special duration value of 0 is reserved to indicate 
>     |
>              that the event lasts "forever", i.e., is a state and is 
>     |
>              considered to be effective until updated. For robustness, 
>    |
>              the sender SHOULD still retransmit the named event 
>     |
>              periodically.
>
>
> 1) From an implementation perspective, if we receive Event packet with '0'
> duration, is this event supposed to be played out infinitely until either
> the 'End-bit' or a new timestamp ?  What are consequences if the 'End-bit'
> packets (even if transmitted multiple times) get lost and the other 
> side is
> then in a mode of DTX (discontinuous transmission), will this mean the 
> tone
> gets elongated beyond actual length ?
>
> 2) Also what does RFC2833 say about the expected behaviour when 
> duration is
> 0 for tone packet (the other kind of rfc2833 packet) ?
>
> Thanks,
> Raghavendra
>
> _______________________________________________
> Audio/Video Transport Working Group
> avt@ietf.org
> https://www1.ietf.org/mailman/listinfo/avt

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