NBU Media Manager through DMZ

I'm getting ready to configure a NBU Master behind a firewall in a DMZ to communicate with Media Manager on a NBU Master that is on an internale corporate network.

Running NBU 7.6.0.2 on RHEL 6

Can someone quickly point me to a list of required ports to make this work.

The DMZ master server will maintain it's own catalogs. We simply want to leverage physical backup targets that are available from the corporate network.

Thx in advance!

-Kevin