[Asterisk-Users] RTP timestamps

[brian k. west]

This time stamp issue is all gone.. now if everyone will just UPDATE!

bkw

----- Original Message ----- 
From: "Andres" <andres at telesip.net>
To: <asterisk-users at lists.digium.com>
Sent: Friday, May 21, 2004 4:14 PM
Subject: Re: [Asterisk-Users] RTP timestamps


>
> >
> >VC:  My phone is broken: I get no audio.
> >TAC: Show us a network trace.
> >VC:  (presents my ethereal traces, with the non-counting RTP timestamps)
> >TAC: (laughing) NEXT!!!
> >
> >I have not read RFC1889 (RTP) in detail, but I am positive that the
> >timestamp field was put there for a reason.  Sure, maybe Cisco is a
little
> >overzealous in the way their code handles non-conformance, but to try and
> >put the blame entirely on them is misdirection.  My ATA-186 has problems
> >with the same RTP stream.  GIGO.
> >
> >* needs to generate RTP streams with valid timestamp progression -- 
surely
> >we're not happy to say "the Cisco 79x0 is the only phone that cares about
> >timestamps, so there's the problem".
> >
> >
>
> Hi Vic,
>
> For your information Sipura also suffers from the Timestamp issue.  3
> months ago when I opened the case with them, they explained in detail
> why they needed those Timestamps (it has to do with the jitter buffer
> calculation algorithms).  They told me the problem had to be solved at
> the Asterisk side since there is no reason why the Timestamps should
> change.  They have not seen this weird behaviour with any other SIP
> system besides Asterisk.  In any case, thats why we came up with the
> rtp.c hack, and have been happy ever since.
>
> -- 
> Andres
> Network Admin
> http://www.telesip.net
>
>
>
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