It is always suggested to mark the traffic as close to the source as possible. I believe your IP phones are connected to the edge switches. Though your phones mark the packets & send to the edge switch, the edge switch would wack off the marking & reset it to the DSCP 0.
You need to configure your edge switches for QoS & trust the markings you would be receiving from your IP Phones. Preserve the markings on the trunk uplinks to the CORE.
I am not sure if your phones are capable of marking (siemens), but it does then it's good as you just need to trust the markings. If not, then you can manually set the CoS value on the interfaces.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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