Ideas for a calling/paging system? small office, 2 way, inexpensive

Hello :) could someone help with some ideas for 2-way communication?

I'm looking for a way for us to call or page the other person without having to pay/setup a phone line

My boss calls out for help (a lot). We were in a smaller office where he could call out a question (raise his voice) and I could call out the answer or walk a short distance if it was more complicated. We recently moved to a new office. There is more distance between the rooms and better sound dampening (he likes to take phone calls on speaker phone).

I can hear him when he calls out my name for help, however, I have to walk to his office to hear his questions and sometimes I need to be at my computer to answer said questions, so it's a lot of walking back and forth. Cell Phone isn't an option because sometimes I need to help with things while he's on the phone or I might be on the phone.

As far as an intercom or Walkie-Talkies, I'd rather not have it where is just broadcasts what he is trying to say because I might be on the phone and I know he will just keep repeating my name until I respond.

I've tried looking up intercom and WT options, I know they have an option to page, but they all appear to also have the option to just broadcast (I know he will choose that option every time 🥴)