 Hi, I'm Andy from Riedel and in this video we're going to be talking about the meaning of the term trunk line. Now a trunk line is not something long and thin that you might draw on a tree. It actually refers to a connection that you would make between two independent intercom systems. Now the trunk line is the connection between these systems and typically you would have fewer trunk lines than each system has users. The connection that we use between the systems can take pretty much any kind of audio format. It can be a regular phone line, a VoIP connection, a satellite link, VHF radio, it could be XLR with analog audio, doesn't really matter. The point is that we have one independent system to the other side we have another independent system and then we have the trunk lines linking them. The trunk lines are dynamically assigned which means that you're only making use of a trunk line when there's an active audio connection. That means that if you're having a conversation with someone across trunk lines and there are pauses in the conversation, it's very possible that you're going to be using different trunk lines for each part of the conversation, but for the end user they have no idea even that they are using a trunk line so it really doesn't matter. It allows the system to be a lot more efficient because the resources can be assigned as and when they're needed according to what's available.