No!
The extra jacks are for a headset (RJ-9) and a RJ-14 (AUX) jack for connection to business-class headsets that have a feature known as Electronic Hook Switch, or EHS. There are two RJ-45 Ethernet jacks. One goes to your switch (SW) or router, and the other goes to a downstream computer or other device, as a convenience. They are not for connecting other phones. If you use a flashlight and/or magnifying glass, you can see the icons next to the jacks.
If you want other phones, then either buy more OBi phones, or buy an OBi 200 or 202, and plug in your existing analog phones into the 200 or 202's phone jack(s).
Given all of your many questions, I suggest that you download and read through the quick-start, user guide and optionally, the administrator guide, before someone tells you to RTFM:
http://www.obihai.com/docs-downloads