QOS in CUCM 8.6

[Andrey Gerasimov]

hello!

i have CUCM ver. 8.6.

where can i configure QOS Expedited Forwarding for phones 9971, 9951, 7945, 7940. 6921 etc in CUCM?

where can i change default configuration cs0? i want change cs0 -> cs5 for all phones in CUCM.

[Gordon Ross · Accepted solution]

CCMAdmin -> System -> Service Parameters -> (Any node) -> Call Manager -> Clusterwide Parameters (System - QOS)

GTG

[Mohammed al Baqari]

Hi,

This can be changed from service parameters. But I am not aware about any voice traffic marked as cs0 by cucm except rsvp failed calls (assuming that you are still passing them).

If you dont see markings in your network you need to check if it is getting stripped by another device such as cisco switch without trust config.

[Terry Cheema · Accepted solution]

As the below posts by my friends Mohammed and Gordon (+5) - CUCM will by default mark the audio traffic as ef or dscp 46.

Other location you can check is enterprise param configuration page in CUCM, most of the params are by default marked correctly. There is a param: "DSCP for Phone-based Services Required Field" for phone services etc thats by default marked as 0 - if you have phones using services etc. you can set that as well to cs3 but other than that most of the things are marked by default.

You just need set your switch ports where the phones are connected to trust the dscp - if you have qos enabled on your catalyst switches and trust the dscp on the uplinks.If you dont have qos enabled then by default the markings should be passed through as it is.

-Terry

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[jameskuder]

What would cause us to see markings for EF and CS1 on calls with auto qos enabled on switch port. Audio is choppy, robotic, piano sounding, and some disconnects. This happens on 7962 phones and also IP Communicator phones in uccx environment. Telco lines clean and error free and verify sending EF

[Mohammed al Baqari]

Are the phones and voice gateway located in the same LAN or splited by WAN

[jameskuder]

The are across the WAN

[Mohammed al Baqari]

In this case you need to check you Wan qos and your wan utilization.
Marking is part of qos implementation but you need to make sure that
traffic is falling in the right queues and the right bandwidth is
allocated. Also, you need to make sure that your queues aren't dropping
traffic. Verify if your lan is stripping marking before the traffic reaches
CE router. Then you need to look at your mpls monitoring to check its
utilization, cos-1 jitter and packet loss.

These are quick check points which you can start with.