Ok, here is what I figured out - Once the IPLE (voip daughterboard) is installed, you no longer use the GCD-CP10's ethernet port. Either set it's IP address to 0.0.0.0 or give it an IP address on a different subnet as the IPLE. Point PCPro/WebPro to the IPLE's IP address.

Now, if I could only get InMail to work, a call to 3999 results in 1 ring then a busy signal....