D65 Visual Voicemail and Parking

Experimenting with using a cloud server for FreePBX Distro, using Digium D65 phones. They provision no problem via DPMS, calls are good, most functionality is correct etc…

The issue is visual voicemail and parking do not return data to the phone. I’m assuming I have a firewall issue either on the client (phone) side or on the VM side (FreePBX). Anyone have any idea what ports need to be open for Visual Voicemail and Parking info to get back to the phone?