[cisco-voip] Changing codec to solve quality issue?

[Erick Wellnitz]

Nothing appears out of the ordinary from the captures I've done on my
phone.  DSCP is set properly and there doesn't appear to be long delays in
packet delivery.

One hypothesis we have is that the political aspect has amplified the
actual problem.

I'll try to capture some more if I can convince someoen to switch back for
testing purposes.


On Thu, Sep 19, 2013 at 12:34 PM, Divin John (dijohn) <dijohn at cisco.com>wrote:

> Do you have a packet capture from the Phone?
> Regards,
> Divin
>
> From: Erick Wellnitz <ewellnitzvoip at gmail.com>
> Date: Thursday, 19 September 2013 7:52 PM
> To: cisco-voip <cisco-voip at puck.nether.net>
> Subject: [cisco-voip] Changing codec to solve quality issue?
>
> CUCM 9.1.1a
> 8945 with sccp 9.3.2
>
> Really odd situation here.  If we use G.729 we have bad quality issues
> consistently even with QoS applied and confirmed by TAC.  If we use G.711
> we have no quality issues.
>
> We have plenty of bandwidth to run G711 but I don't like not knowing why
> something is happening.  It doesn't make sense why jitter and latency would
> be through the roof with G729 wile G711 is perfect.  I know G729 is more
> sensitive to latency and jitter but it shouldn't cause higher latency and
> jitter.
>
> Could this be something in the carrier's underlying architecture?
>
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