[cisco-voip] Low IP Phone MOS Values

[Tim Smith]

Hi Guys,

Not sure on your MOS scores. You could look at doing some testing with Cisco
IP SLA.

The Null values in CMR should be easy.

First of all - check your service parameters

1. Under CallManager service parameter - check "CallDetailRecordDiagnostic"
is set to always enabled regardless of CDR. (It is cluster wide so you only
need to do it on one server)

2. Go to CDR Analysis and Reporting Tool. Check the CDR loading schedule.
There is a tick box here that says "Load CDR only" it is on by default -
hence no CMR records are loaded.
Untick it. Save and then restart your CAR Web Scheduler service.

Then make some test calls and go back and check CDR / CMR.

Cheers,

Tim



On Thu, Jul 9, 2009 at 1:57 AM, Andrew <voiptech at gmx.de> wrote:

> Dear All,
> I am currently troubleshooting issues with very low MOS values being
> displayed on the IP Phone statistics. While the customer isn’t noticing any
> issues with voice quality, I’ve been asked nevertheless to attempt to
> resolve the issue.
> There are around 20 IP Phones (7940/7961) in use on the site, and at any
> given time 2 -6 of them can be displaying low values, usually the same
> culprits every time. The phones are using the G711 codec and the switches
> are connected (with 1 exception) via gigabit links.
> The interface counters on the phones and the switches between the phones,
> gateway and call manager (retracing the entire path) don’t have any more
> than a normal volume of errors (>1%). QOS is configured on all interfaces.
> We made test calls both internally and externally with 5 separate phones
> attached to each of the switches, and every time the MOS results were
> between 4.48 and 4.5.
> Values for the phones with issues look like:
>
> MOS LQK 2.0000 Avg MOS LQK 2.2219 Min MOS LQK 2.0000 Max MOS LQK 4.1779
> MOS LQK Version0.95
> Cumulative Conceal Ratio 0.5963 Interval Conceal Ratio 0.0860 Max Conceal
> Ratio 1.0000
> Conceal Secs 140 Severely Conceal Secs 133
> Latency 0 Max. Jitter 19
>
> However at some point the values are going back to the same low values. We
> enabled CMRs for the calls to determine if specific calls were showing the
> poor values, however for all of the calls being logged the media info is
> still carrying only the values “null”.
>
> Does anyone have any advice on how we could try an resolve this issue, or
> if not the MOS issue than the null values for the CMR records?
>
> Thanks for any help anyone can offer,
>
> Andrew Cook
>
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