I am going to try to explain this the best I can.
We have a Mitel phone system and we use the MiCollab app for cell phones and tablets and it works great when we are on the internal network and out the office on a cellular network or home Wi-FI. The Mitel server has a DMZ zone that runs straight to the internet by passing the Sophos Firewall and uses mca.ourcompany.com as a DNS name and the MiCollab client connects to that internally and externally.
The only time I can't get it to work is when we are on the Guest Wireless here in the office that runs through the Sophos XG firewall. The guest network is on its own VLAN and has full access to the internet on the firewall with a rule allowing "Any Service" out through that VLAN. I am guessing it's a firewall related issue or something but I haven't been able to figure out why.
Any help would be appreciated. Thank you.
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