QoS Traffic through Switched Network

Switch1 connects to Switch2 via dot1q trunk. 2 Cisco IP phones are connected to Switch1 and CoS is trusted.

In order for these Cos values to pass through to Switch2, is it neccessary for Switch1 and Switch2 trunk links to "mls qos trust cos" or will they trust the cos by default?

Whats an easy way to check this?

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