[SIPForum-discussion] RTP Timestamp field

[Rajlekkala]

Hi,

For ordering packets sequence number filed will be used, timestamp field is
used for playout duration based on sampling freq and frame rate,
synchronizing and for jitter calculation.
Timestamp field is initially generated as random number and increments for
each packet based on the sampling frequency and frame rate. When wrap around
happens the timestamp field continues from zero instead of generating random
value.
Wrap around handling for timestamp is similar like sequence number wrap
around handling.

Please let me know if i am wrong.

--raj.


On Fri, Jun 13, 2008 at 8:01 PM, sreekant nair <sreekant_nair at yahoo.com>
wrote:

> Hi All,
>
> We have a query regarding the Timestamp field of the RTP Header.
>
> RFC 1889 Sec 5.1 states that the initial value of the RTP time stamp should
> be random just like the Sequence number. However when the 32 bit field wraps
> around, does it continue from 0 or is another random number generated? How
> are out of order packets handled when a wrap around happens?
>
> Thanks in advance
>
> Regards
> Sreekant Nair
>
>
>
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-- 
-Raaz
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