Step by step instructions to get DHCP Option 43 working on Mikrotik RouterOS 6.x
Many consumer devices allow you to pass configuration parameters like auto provisioning servers and such via dhcp. DHCP option 43 is used by Yealink, Ubiquiti and Ruckus as well as many others.
My need was to use it to send the address of the provisioning server to a number of Yealink T23G IP phones to make deployment easier.