Public IP Address for Device behind Cable/DSL Modem

Hi,

Need advice as to whether or not this is possible... We have several
ethernet building control devices that we want to connect to Cable/DSL
modems for internet access to their web pages and so they can
communicate with eachother. The catch is that each controller needs
to be configured with a static Public IP address and not a local IP
address. This is because each controller sends its static IP address
to the other controllers so they can talk to eachother on demand.

Will it be possible to arrange with ISP's to assign static Public IP
addresses to our building controllers, even though each controller
will be sitting behind Cable/DSL Modems?

Many thanks,

Ellis

.

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