A:AnswerThere is an opening in the rear. Mounting would have to be done by pulling the top portion of the back down in order to make it level. The cord hooks into the TOP of the phone so your cord would have to slide behind from the top. There is no back center jack. You would also have to use mounting hardware as this will not fit the older rectangles that phone companies used to install.
A:AnswerI'm not sure if this phone will work for you. I don't think so, because you don't have a wall jack. This phone requires a wall jack and is very cheap.
A:AnswerI can hear fine using the ear hook and speaker but the people I'm talking to have a hard time hearing me when I try using the speaker to talk to them.
A:AnswerYes, I have mine hooked up to a conventional answering machine. Yes, the cords can be replaced. Yes, when the ringer is off - there is no sound from an incoming call. Hope this helps. It's been a very good phone!