AST Managing multiple Astrisk boxes

[1stmicro]

We have a location that has 3 Asterisk PBX's.  1st box extensions 600-620. 2nd box extensions 700-710. 3rd box extensions 800-840. They are all connected with IAX trunks over high speed DSL lines.
The customer wants the ability to have one reception console that can manage calls to all 3 extension ranges.  For example. Reception is extension 600. She is running AST and wants to see the 600, 700 and 800 extensions in the console allowing her to manage calls to all the extensions. Parking. Transfers. See the phone status.
Is there a way for AST Assistant to do this?
Thanks.