RE: Dumb question - what do the codec command do on dial peer

From: Hunt Lee (Hunt.Lee@telecom.co.nz)
Date: Thu Aug 05 2004 - 18:13:42 GMT-3

Oh...

Isn't the default for G.729 is 8byte whereas G.711 is 64bytes?

Can you please elaborate a bit more on where do you find the payload of
G.729 to be 30bytes?

Or any URL would be great too!!!

Thanks,
Hunt

-----Original Message-----
From: Edwards, Andrew M [mailto:andrew.m.edwards@boeing.com]
Sent: Friday, 6 August 2004 3:52 a.m.
To: Hunt Lee
Subject: RE: Dumb question - what do the codec command do on dial peer
actually represent?

I don't know if it came across correctly, but the default is 30bytes...
You are lowering it to 10 bytes therefore lowering the processing delay
but increasing the affect excessive jitter can have on the voice
quality. Basically the packets are processed faster, but they playback
at the same rate, so when the playback buffer is smaller (per packet
SMALLER), then delay variation can affect the overall buffer... Maybe
even allowing the buffer to starve (silence)...

HTH

-----Original Message-----
From: Hunt Lee [mailto:Hunt.Lee@telecom.co.nz]
Sent: Wednesday, August 04, 2004 6:15 PM
To: Edwards, Andrew M; Joe Rinehart
Cc: ccielab@groupstudy.com
Subject: RE: Dumb question - what do the codec command do on dial peer
actually represent?

Okay. Thanks for your explanation.

But if the command increases both 'bandwidth' & 'delay', what's the
point of the IOS command?

I'm sure if it is a lose-lose situation, nobody will ever want to use
that command, right?

Thanks,
L.

-----Original Message-----
From: Edwards, Andrew M [mailto:andrew.m.edwards@boeing.com]
Sent: Thursday, 5 August 2004 12:20 p.m.
To: Hunt Lee; Joe Rinehart
Cc: ccielab@groupstudy.com
Subject: RE: Dumb question - what do the codec command do on dial peer
actually represent?

The default BW for G.729ar8 is 8 kbits per second.

The default byte count per sample for 729ar8 I believe is 30 bytes

The larger the number of bytes encoded per sample will translate into
larger delays between packets (e.g. longer to process)
  
I am sure there is more too it, but that's the general idea (at least
that's how I understand it). The deeper understanding is how the
encoded sample size has an effect on setting up traffic shaping on a WAN
such that you do not starve out voice packets because of the added delay
of encoding more bytes per sample.

andy

-----Original Message-----
From: Hunt Lee [mailto:Hunt.Lee@telecom.co.nz]
Sent: Wednesday, August 04, 2004 2:38 PM
To: Joe Rinehart
Cc: ccielab@groupstudy.com
Subject: RE: Dumb question - what do the codec command do on dial peer
actually represent?

Hi Joe,

Thanks for your reply.

But my question is say since the default bandwidth for G.729 is 8bytes,
now I have increase the bandwidth per call to 10bytes.

By increasing to 10bytes, does it increase the delay or decrease the
delay per call?

Thanks,
L.

-----Original Message-----
From: Joe Rinehart [mailto:jjrinehart@hotmail.com]
Sent: Thursday, 5 August 2004 9:36 a.m.
To: Hunt Lee
Subject: Re: Dumb question - what do the codec command do on dial peer
actually represent?

chooses the dial peer codec and the packet size
----- Original Message -----
From: "Hunt Lee" <Hunt.Lee@telecom.co.nz>
To: <ccielab@groupstudy.com>
Sent: Wednesday, August 04, 2004 2:26 PM
Subject: Dumb question - what do the codec command do on dial peer
actually represent?

> Hi guys,
>
>
>
> What does this command do?
>
>
>
> 'codec g729ar8 bytes 10'
>
>
>
> I look it up on CCO and any books I can find, yet I still don't quite
> understand what it achieve.
>
>
>
> Greatly appreciated if anyone can shed some light on this.
>
>
>
> Cheers,
>
> L.
>
>
>
>
>
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