How both Cisco IP phones and PC work using a single UTP cable to switch?

Cisco IP telephones have included a small small LAN switch, inside the phone. A single UTP cable from switch is connected to one physical port on the embedded switch of phone and a short patch cable to PC is connected to the other physical port in the internal switch of IP phone.

To make that happen, the switch port acts a little like an access link (for PC’s traffic), and a little like a trunk (for the phone’s traffic). There are 2 VLANs on that port, as follows: Data VLAN & Voice VLAN.

How to configure the Voice and Data VLANs on ports connected to phones?

SW1# configure terminal

SW1# vlan10

SW1 (config-vlan) # vlan11

SW1 (config-vlan) # interface range Fastethernet0/1 – 4

SW1 (config-if) # switchport mode access

SW1 (config-if) # switchport access vlan 10

SW1 (config-if) # switchport access vlan 10

SW1 (config-if) # switchport voice vlan 11

SW1 (config-if) #^Z

SW1#

Note: CDP is enabled by default, so its configuration is not required.

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