With all UClear intercom systems, you don't have to go through the full intercom pairing process each and every time you want to pair units for intercom. Once the full pairing process has been done and all units are double flashing green, turning off all units will save that pairing into permanent memory.
From then on, you can simply turn on all units, and then hold the Volume Up button for 2 seconds on any single unit, and it will quickly rejoin intercom for all units that are turned on. Conversely, holding the Volume Down button for 2 seconds will disconnect intercom for the whole group.