[cisco-voip] CME Internal Voice Quality Issues

[Quenten Grasso]

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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