CCNA 2.4.a: How to configure an access port for data and voice
How to configure an access port for data and voice. You need to do this when you have a computer connected to a VoIP phone at a desk. The VoIP phone has two different ports in the back and acts as a switch. The PC port is for the computer and it uses the access vlan configured on the switchport. The switch port on the back of the VoIP phone connects to the switchport and the VoIP phone will use the voice vlan configured on the switchport.
Try it yourself in PacketTracer: CCNA-How-to-configure-an-access-port-for-data-and-voice.pkt