The Ports window lets you select which ports you want iCu2 to "listen" on for incoming calls (also known as connects) and QMs.

Under most circumstance you will never need to change these settings but if you have a home network with more than 1 computer using iCu2. You would need to setup different Ports for each computer's iCu2. More information related to this can be found within the Call Connect Pal  FAQ.

The default settings are shown below: