How to publish OWA for new exchange 2010 server in new Site

Hello All,

we have exchange 2010 SP 3 DAG environmnet in Site C and OWA is published on ISA 2006 in Site A. 

We are planning to setup new DAG environmnet in Site B. 

There is 100 MB link from Site A to Site B 

And 1 Gb link from Site B to Site C.


Do I have make any changes on ISA server (like cas array / rule ) , so that users in new site can access same webmail url from outside / inside 

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Thanks

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sandip