By monitor what do you mean? To be able to listen to there telephone conversations? Or monitor the room even when they are not on the set? If you want to monitor the conversations you could get a system and set the stations for not private but you would have to switch from line to line to hear the parties, you won't be able to hear them all at the same time, I don't think they make anything that you can monitor them all at the same time, but if they are all on the same line you could monitor them all with the set being assigned non privacy.

Russ runs a local service and private tech center.

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