Without getting bogged down in too much technical detail: Switchboard TS is designed to allow your BRIC codecs (such as ACCESS) to connect with each other without having to have an IT guy onsite everywhere you go.
This diagram shows a typical NAT Router scenario: a codec connecting to Switchboard TS “punches a hole” through the NAT or firewall which in turn allows for a return path back to the codec. Once a codec has reached out to another device on the Switchboard TS, the two units handshake and exchange all of the “technical details” that they need to send audio back and forth.
These “details” include the specific route that data needs to travel to get to each device. This is really the tricky part since NATs and firewalls can make it difficult for data to get through. However, once the two devices have made contact via the Switchboard TS, a “Peer-to-Peer” connection is established and audio is bidirectionally transmitted until either one of the units disconnects or the circuit is terminated.