Home office phone....no landline available. Help

I started a new job recently, mostly work from home, and they have a different phone setup. I now have a phone that needs to be plugged into a phone jack, however my house doesn't have any. My internet router is all located in the attic, so I obviously can't use the phone up there. Running a line from my attic to office isn't an option.

Any devices I can use to create a wireless connection? Any other thoughts?