I'm new to the BES world so please ignore my ignorance at this point...

Current layout:

Internal network - hosting LN domino server, and all LN clients
Perimeter network - hosting ISA server with mail relay to internet (inbound/outbound email relays)

I want to add a BES server to this configuration.
A) where would the BES server have to go? Internal network configured to talk to the ISA relays, or on the Perimeter network? These networks both have firewalls, so I'm assuming 3101 TCP has to be opened for outbound to RIM servers?
B) What gets installed on the Lotus Domino server to interact with BES server?
etc... Anything else that I would need to know about BES??

Thanks in advance for any help...