Office Web Apps Server URL Issue

Hello,

I worked arount these issues.

1. WAC services worked fine with Lync 2013 (Powerpoint..)
2. I followed instruction for Exchange 2013 Organization configuration, OWA virtual folders, etc.
If I open my Office Document, I can see a new window in OWA, which try to open my document. When I'm looking for the URL, it's the external FQDN.

Conclusion, when I try internal OWA, the external FQDN of my WAC server is used.

Is it really possible to use internal AND external address for OWA and WAC?

Any Idea?

Jean-Luc CHANDEZON [MCT]