QoS Help

All,

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I'm new to QoS and seeking some advice. As far as i am aware, we only have QoS set up on our MSP provded router to our ASA.

As an example, one of our sites is configured as per below:

Client PC ----> Cisco 4507 (NO QoS configured) ----> Cisco 3750 (NO QoS configured) ----> Juniper SRX 110 (MSP equipmet, QOS) -----> WAN -----> ASA 5516 (NO QoS configured) -----> Internet....

Could someone explain to me if we are actually utilizing QoS or does it have to start from the endpoint (Client PC)? If we are not, would someone be so kind to point me in the right direction in to getting QoS fully working on our network?

We are currently using a Mitel VOIP system and use Skype For Business as our go to audio/visual meeting area.

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Thanks

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EDIT: We are currently using a Mitel VOIP system and use Skype For Business as our go to audio/visual meeting area.