on the port connected to the ip phone:

auto qos voip cisco-phone

the above comman Enable auto-QoS on the interface, and specify that the interface

is connected to a Cisco IP phone.

The QoS labels of incoming packets are trusted only when the

Cisco IP phone is detected.

on the turnk between swithc to switch or switch to router:

auto qos voip trust

this command Enable auto-QoS on the interface, and specify that the interface

is connected to a trusted router or switch

Please, if helpful Rate