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Switch(config-if)# switchport voice vlan {vlan-id | dot1p | untagged | none}
Switch# show interfaces type mod/num switchport
Switch# show running-config interface type mod/num
Switch# show running-config interface fastethernet 1/0/1 interface FastEthernet1/0/1 switchport trunk native vlan 99 switchport access vlan 10 switchport voice vlan 110
Switch# show spanning-tree interface type mod/num
Switch# show spanning-tree interface fastethernet 1/0/1 Vlan Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- ---------------------------- VLAN0010 Desg FWD 19 128.51 P2p VLAN0110 Desg FWD 19 128.51 P2p