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Is it wrong to assume that as long as the packet is tagged with EF, and trust is enabled on all trunk ports that the switch will prioritize the VOIP traffic?
Guaranteed wrong - no, but very likely it's incorrect.
Or do is I still need to configure the queues?
Depends on the device's default and what you want to accomplish.
On many most Catalyst switches, QoS is disabled by default. Enabling it will often default to all ToS markings being erased, default different CoS/ToS markings mapped to different queues, default proportional resource allocations, default no PQ for EF traffic.
If your switches support it, AutoQoS might be sufficient, alone, to prioritize your EF tagged traffic.
