[cisco-voip] Poor Receiving Audio on 69xx, CUCM 8.5.1

[Anthony Kouloglou]

Hi Roger,
i have tried isolating one 6911 behind a L3 device (cisco 881).
The same poor audio received (it was the only device on that particular 
LAN!)
No problem exist for calls in the same LAN.
I am pretty sure that 69xx hardware is not as good as a 79xx causing the 
poor, choppy, disrupted audio.
But i can't prove that!
Why can't it get better with iLBC?
I can accept that the wan connection is not as "good" as a LAN 
connection but that is why iLBC was introduced!
It gives no better performance than g729 at all!

BR
Anthony


On 28/3/2012 10:12 μμ, Roger Wiklund wrote:
> Hi,
>
> You don't need a Cisco switch to enable QoS, you just need any
> slightly advanced switch that can support DSCP or 802.1p and honor the
> tagging.
> Do you have the same problem if two phones on the same LAN call each other?
>
> On Wed, Mar 28, 2012 at 3:55 PM, Anthony Kouloglou<akoul at dataways.gr>  wrote:
>> Hmmm ,
>> i can't use QoS because it is not a cisco switch where the phones are
>> connected.
>> I have checked during an active call both 79xx and 69xx.
>> They both report a few Lost Rcv packets (~50-80 in a 5 minute call).
>> But i can tell: there is not data packet loss over the wan.
>>
>>
>> ΜΦΧ/Kind Regards
>>
>> Αντώνης Κούλογλου - Anthony Kouloglou
>>
>> Field Network Engineer, Cisco UC Specialized
>>
>>
>> DATAWAYS Communications S.A.
>> 75, Kanari Str., GR-544 53 Thessaloniki - Greece
>> Phone +30 2310 953953  Fax +30 2310 953963
>>
>>
>> On 28-Mar-12 16:37, Roger Wiklund wrote:
>>
>> Do you have QoS enabled on the switchports where the 6921 phones are
>> connected? I would check the network to ensure you have the EF tags
>> and QoS is enabled end to end.
>> I know you said that the other phones are working, but I would check
>> for EF drops in routers/switches.
>>
>> /Roger
>>
>> On Wed, Mar 28, 2012 at 3:21 PM, Anthony Kouloglou<akoul at dataways.gr>
>> wrote:
>>
>> OK Bill,
>> thanks for your time.
>>
>> BR
>> Anthony
>>
>>
>> On 28-Mar-12 16:19, george.hendrix at l-3com.com wrote:
>>
>> Duh, guess I totally missed where you said that.  I can't say anything
>> about the 69XX models, haven't used them yet.
>>
>> Bill
>>
>>
>> -----Original Message-----
>> From: Anthony Kouloglou [mailto:akoul at dataways.gr]
>> Sent: Wednesday, March 28, 2012 9:04 AM
>> To: Hendrix, George (Bill) @ LSG - STRATIS
>> Cc: cisco-voip at puck-nether.net
>> Subject: Re: [cisco-voip] Poor Receiving Audio on 69xx, CUCM 8.5.1
>>
>> Hi,
>> when i say poor audio receiving, i mean choppy (cutting in, in the
>> remote site).
>> This is noticed ONLY on 69xx!!
>> All 7911, 7961 can hear nice (even in g711) so the upload bandwidth of
>> the central site is not the problem.
>> I didn't want to use g711 since i though it is more bw consuming.
>> That is why i tried g729 (and ilbc)
>> All the times, only the 69xx could not receive well (choppy audio,
>> cutting in)
>>
>> BR
>> Anthony
>>
>> On 28-Mar-12 15:54, george.hendrix at l-3com.com wrote:
>>
>> Also, did you configure the codec to be used between each site and the HQ
>> in Regions?  We recently installed 8.5 and I noticed when the codec was set
>> to "64 kbps (G.722, G.711)" the codec actually used on the call was G.722
>> and it sounded terrible.  I had to go into CallManager service parameters
>> and set "G.722 Code Enabled" to disabled.  After this, the calls sounded
>> fine.
>>
>> Bill
>>
>>
>> -----Original Message-----
>> From: cisco-voip-bounces at puck.nether.net
>> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Anthony Kouloglou
>> Sent: Monday, March 26, 2012 5:11 PM
>> To: cisco-voip at puck-nether.net
>> Subject: [cisco-voip] Poor Receiving Audio on 69xx, CUCM 8.5.1
>>
>> Hi all,
>> in a CUCM 8.5 i have several 69xx and 79xx at a remote site.
>> The HQ has a cluster of 2 CUCMs 8.5.1
>> There is 30ms RTT between HQ and remote site and data packet loss.
>> Though, all 69xx at the remote site have very poor audio either with
>> g711, g729 or iLBC!!
>> The other end at the remote site hears fine with no disruptions.
>> All 7911, and 7961 at the remote site have very good reception of g729
>> or g711.
>> Could the 69XX be such a bad product?
>>
>> BTW, they run the latest firmware.
>>
>> BR
>> Anthony
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