Hangouts Meet allows members of your organization to use more advanced features than the ones typically available for Hangouts users in meetings of up to 25 connections for Basic and Business accounts, and 50 for Enterprise users. Considering that a meeting room would count as just one connection, you could connect many offices and a few members that are working remotely.

Enable Dial-in and Hangouts Meet automatically creates a phone number and PIN for each video meeting so that users can join through a phone call.