[cisco-voip] CME Internal Voice Quality Issues

[Sreekanth]

When troubleshooting voice quality issues, it is important to take packet
captures from multiple points in the RTP path.
It also helps if we have some pattern in the issue.

Are you seeing the voice quality issue only when phones of a particular
combination of sites are conversing? For instance, only between phones of
site A and B, or B and C?

Since the 2 phones conversing are skinny, and registered to the same CME,
the RTP path is going to be directly between them and not going through the
CME.

Have you tried taking packet captures at the 2 phones in the call, and
observe the delay, jitter and skew of the packets arriving from the other
site, and vice versa? It would also help if you took packet captures at the
edge routers and filtered them with the IP addresses of the 2 phones
involved in the call.


On 9 May 2017 at 10:55, Quenten Grasso <qgrasso at onq.com.au> wrote:

> Hi All,
>
>
>
> I’m looking for some possible tips to try and diagnose some internal voice
> quality issues which we seem to regularly be having…
>
>
>
>
>
> We have a multi-site deployment of a Cisco CME using Cisco 7960 IP Phones
> running Skinny and using firmware c2800nm-adventerprisek9-mz.151-3.T4.bin.
>
>
>
> As I understand were not using a standard deployment via having the phones
> go over the private Ethernet service to the PBX instead of locally hosted
> PBX’s, however I can’t see why this would be an issue.
>
>
>
> Each site is configured with QoS on switches/routers and WAN interfaces as
> per cisco best practices and none of the sites wan links are particularly
> busy either.
>
>
>
> The PBX/Router is centred In our Datacentre and our 3 sites are connected
> via private Ethernet circuits, below shows the latency between each site.
>
>
>
> From PBX/Router to Each Site,
>
> Site A - round-trip min/avg/max = 32/33/48 ms
>
> Site B - round-trip min/avg/max = 16/16/20 ms
>
> Site C - round-trip min/avg/max = 28/31/36 ms
>
>
>
> From Site A to Each Site,
>
> PBX – round-trip min/avg/max = 32/35/40 ms
>
> Site B -  round-trip min/avg/max = 48/48/48 ms
>
> Site C -  round-trip min/avg/max = 60/62/64 ms
>
>
>
> From site B to each site,
>
> PBX - round-trip min/avg/max = 16/16/20 ms
>
> Site A - round-trip min/avg/max = 44/47/68 ms
>
> Site C - round-trip min/avg/max = 44/46/48 ms
>
>
>
> Site C to each Site
>
> PBX - round-trip min/avg/max = 28/31/36 ms
>
> Site A - round-trip min/avg/max = 60/63/88 ms
>
> Site B - round-trip min/avg/max = 44/46/48 ms
>
>
>
> Any Ideas?
>
>
>
>
>
> Regards,
>
> Quenten
>
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>
>
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