QoS on 3850 Core and 2960 as Access Layer Switching

[SinghRaminder]

Hello Experts

This is my configuration, I am new to QoS but was reading it lately
My requirement is to implement QoS for Microsoft Teams as per thier document on Cisco 3850 which is acting as core

Attached is the normal diagram of my network.

The idea is to prioritize Teams Audio and Video Traffic only, rest is fine to go in default class

I have this in my mind, can someone assist here and let me know if this is correct or if I am missing anything?

System Team is marking the packets according to the Microsoft Link here :

https://docs.microsoft.com/en-us/microsoftteams/qos-in-teams#choose-initial-port-ranges-for-each-media-type

But i think, i will still do the ACL, although ACL will spike the CPU, any thoughts ?

Per Diagram :

IDF-A to Core and IDF-B to Core are 20 Gig Port Channel
Core to Firewall is 2 Gig PortChannel
Outside ISP circuit is 2 Gig as well

IDF-A is stack of 2960-X and IDF-B

I am not seeing much congestion, but still users complaints about Teams call freezint etc

So i have been tasked with this

class-map match-any MS-TEAMS-AV
match dscp ef cs5 af41 af21
match cos 5

class-map Class class-default

policy-map MS-TEAMS-AV
class MS-TEAMS-AV
priority level 1 percent 30
class class-default
bandwidth remaining percent 100

And last thing, I am going to trust all the ports where PC,Phones, Uplinks, Downlinks are connected with

auto qos trus dscp

Any thoughts here please:

Thanks