Hi there,
New to Obi.
Can't find any information whether or not I can add more phones to other jacks in my house once the first phone is set up with obi voip.
Also, does the obi device need to be connect to the router or can it be connected to any ethernet port in my house?
if that's possible, do my phone jacks need to be isolated from the Telco's system?
The OBi needs to have an IP connection to your router. How you do that is up to you.
I answered your other question elsewhere.