ISA 2000 and Jabber Clients

I am trying to get my internal members to be able to connect to an external jabber server. I know the server is up because other users outside my lan can connect. I actually maintain both networks. The issues is in this offices LAN which is using an ISA 2000 firewall. I have tried everything to get the ports to open up and they do not seem too. Does anyone know how to open the ports up for all users on ISA 2000.

This is not a Jive Messenger question, so marking this question as “assumed answered”.

-Matt