Which wireless intercom "director-secretary" to choose?

Question

Wireless connection

There are a couple of offices on the same floor. In one office, the head, in the second - subordinates. You need to make a speakerphone like a director-secretary. He pressed the button - "Ivanov, come in" - the employees heard in the office - Ivanov went to the head. Everything, all the required functionality.
Despite the close distance of the cabinets, pulling the wire is extremely hemorrhoids. So a wireless solution is needed. In general, I think that the simplest and, moreover, the cheapest option is two ordinary walkie-talkies, but we should also consider solutions designed specifically for such purposes.
I'm looking for manufacturers on Google - sites are somehow murky, devices are somehow incomprehensible, either expensive, or as if they were made on the knee. I would like to hear the advice of the public, so as not to step on a rake.