How to allow OWA to be accessible from internet with the same public IP for edge 2013 exchange

Hello,

I have a CAS, MBX and Edge all separate in exchange 2013. I have one public IP NATed to internal Edge server private IP. I have issued certificates for OWA, active sync and would like to access mails from internet. I need to know how to finalise the setup so that it uses the same published IP used for Edge server.

If I ask my service provider to redirect my OWA URL to the same Edge server public IP, what is most likely going to happen?

Thanks,

Joel chanda

JC