31 Oct
2005
31 Oct
'05
6:08 a.m.
For the case where Asterisk is handling RTP bridging, and not TDM/DAC
conversion, its not a jitter buffer you need but real-time platform
performance.
If Asterisk is the cause of jitter when its relaying media then its a flaw
in Asterisk, just like a slow/broken router will cause jitter when
forwarding from one interface to another.
The fix is not to add a jitter buffer, but quite the opposite and all
buffering and delays should be minimized.
You would need to insure that real-time priority for the entire RTP path
though Asterisk is guaranteed. I expect potential deadlock conditions would
require much work for this to be successful.
Mark
On 10/31/05, Juliano Duque da Silva <juliano.duque(a)terra.com.br> wrote:
I have a similar call quality problem that Ray related when using
asterisk is in the middle of media path specially, when asterisk is
performing codec transcoding. I am not sure this problem is related to
asterisk lack of jitter buffer but it seems to be.
How can we make sure asterisk is not screwing up the jitter buffer?
Someone on this list knows exactly how asterisk performs the "RTP proxing" ?
Juliano
------------------------------
*De:* serusers-bounces(a)iptel.org [mailto:serusers-bounces@lists.iptel.org] *Em
nome de *Mark Aiken
*Enviada em:* domingo, 30 de outubro de 2005 17:41
*Para:* Ray Van Dolson
*Cc:* serusers(a)lists.iptel.org
*Assunto:* Re: [Serusers] Inserting SER into my voice network
I cant see that at all from your diagram. I see only an ATA and Media
Gateway doing final conversion where jitter buffer would be useful. If
turing on a jitter buffer in Asterisk helps then one of the other 2 is
broke.
On 10/30/05, *Ray Van Dolson* <rayvd(a)digitalpath.net> wrote:
When I take Asterisk out of the media path, this is correct. And I believe
my
ISP's media gateway *does* have a jitter buffer.
Since Asterisk was an media endpoint before (it doesn't just proxy the rtp
on), its lack of jitter buffer was hurting us in some cases.
Ray
On Sun, Oct 30, 2005 at 08:55:13AM -0600, Mark Aiken wrote:
The only jitter buffers that matter in your diagram are the SIP ATA and
Media Gateway. Both should have jitter buffers at the point where they
convert RTP to PCM. If adding a jitter buffer inside the network path
somewhere helps then something else is broken.
Mark
_______________________________________________
Serusers mailing list
serusers(a)lists.iptel.org
http://lists.iptel.org/mailman/listinfo/serusers
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.361 / Virus Database: 267.12.6/151 - Release Date: 28/10/2005
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.361 / Virus Database: 267.12.6/151 - Release Date: 28/10/2005