[cisco-voip] Jitter - Codec issue?

[Howard, Chad]

It is a WAN link (vendor MPLS).  I'll check into the SLA idea, thanks.

________________________________

From: Linsemier, Matthew [mailto:MLinsemier at apcapital.com] 
Sent: Thursday, October 26, 2006 1:39 PM
To: Howard, Chad; cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Jitter - Codec issue?



Remember that your Max Jitter is just that, the maximum Jitter for the
entire call.  Your average jitter looks pretty normal for a WAN link.
What type of link is this again?  Is this a Internet or WAN related
link?  If you are using Cisco routers you could enable some IP SLA
responders to dig deeper into the problem.  It will tell you if you are
dropping packets, receiving out of order packets, and a load of other
informative data by sending test packets across the link.

 

Matt

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Howard, Chad
Sent: Thursday, October 26, 2006 2:28 PM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Jitter - Codec issue?

 

RxType=G.729

TxType=G.729

 

RxSize=10 

TxSize=20

 

Avg Jitter=8

Max Jitter=274

 

RxDisc=0

RxLost=1

 

TAC said inbound packet loss could cause the RxSize to be lower.  The
phone didn't show much loss, but jitter was high.

 

________________________________

From: Louis Marascio (lmarasci) [mailto:lmarasci at cisco.com] 
Sent: Thursday, October 26, 2006 9:58 AM
To: Howard, Chad; cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Jitter - Codec issue?

Non matching values should not be a problem as far as I know.  What
codec does the info page show?  How many packets are being lost,
discarded, and what does the phone report as the avg & max jitter?

 

Thanks,

 

Louis

 

________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Howard, Chad
Sent: Wednesday, October 25, 2006 3:39 PM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Jitter - Codec issue?

We have some users experiencing choppy voice - I think related to
jitter, but I don't know the actual cause.

 

During an active call I pressed the ? key twice to get the stats.

 

It shows the "RxSize: 10ms" and the "TxSize: 20ms".  I've seen issues
with that before (I think they need to match).  Anyone know how those
parameters get set, and if non-matching values are in fact a problem?

 

Thanks much.

 

Chad

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