What do I need to text office phones that use a LAN system for functionality?



The large lot I came into has a large number of higher quality phones that seem to be selling well on Ebay.

Being able to test other things with it is a plus. I don't mind buying something of decent quality if it is worth the jump in price...


Can I just plug it into my router and see if it powers up?


thanks in advance, I'd like to get these processing.