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?
Any input would be greatly appreciated.