I would like to build a closed system where I can send faxes and make calls over a distance of around 500m. I've done a bit of research and I think the best way to do it would be with an Analogue Telephone Adapter, like such:
At each end I would like a bank of 2-3 fax machines and 2-3 phones. The above device will do a total of 2 phones or faxs. Any ideas on how I could expand on this number? Could I run cat5 from one router to another and have multiple ATA's off each router?
Currently I don't have a network between the two. I'm working on a proposal for an art installation and I'm trying to get my head around how to implement the technology I want.
I like the look of that Cisco box. Could I have multiple units at each end to expand the number of phones/faxs? How do I connect it all together? Do I have a router at each end that is connected to the PABX, with the cisco box's off the router?