Learned something new yesterday about switchports and port-security. When you have a switchport that is doing Data / Voice, the switch will only see one MAC address such as the phone but we all know that the computer that plugs into the phone has a mac but not directly connected.
The switch will consider that (2) mac-address's but will only have one connected, hopefully you got that. I will put a sample configuration on here!
interface fastethernet 0/10
intf#switchport port-security
(You can add port-security to every port on the switch but until you actually turn it on then it is useless.)
intf#switchport port-security maximum <# of mac-address's>
intf#switchport port-security mac-address sticky
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