I am new to this. It seems to me that the VoIP phone on Switch 'A' will have its packets handled by the "expedited-forwarding" CoS functionality, but that the PBX on Switch 'B' will not enjoy that same prioritization. Is that correct? Are "voip-only" packets prioritized over "data" packets on the trunk connection betweent he two switches, or is additional configuration required to acheive that?
What is the best way to ensure that "voip-only" packets are identically prioritized on every interface?