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

[Justin Steinberg]

are you SIP trunk to the PSTN ?     I would assume poor audio on the g729
codec could be caused within the carrier network.


On Thu, Sep 19, 2013 at 2:03 PM, Erick Wellnitz <ewellnitzvoip at gmail.com>wrote:

> 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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