I've read of 2 ways to configure switch ports for cisco voip phones with attached PCs. Use switchport voice vlan for the phone and either use switchport mode access or mode trunk for data from the PC. Which is better, access or trunk? Why? Is QoS / CoS the same for both options? I'm using 2950s and 3750s. I'd like know how the switch handles vlan and QoS for traffic it receives from the voip phone and PC in both trunk and access mode cases.