This article describes the cable connections on the back of the Avaya and Ploy physical desk phones and how to move the cables from one handset to the other.
On the back of your current Avaya phone, the top connection is from your wall portal. The bottom connection goes to the back of your computer to provide network. There are icons on each connection to identify which is from the portal and which goes to your computer:
On the back of your new Poly phone, the connection on the left is from your wall portal. The connection on the right goes to the back of your computer to provide network. There are icons on each connection to identify which is from the portal and which goes to your computer: