With professional teleconferencing services, each participant’s telephone line is routed through sophisticated audio equipment called a ‘bridge’. This bridging equipment receives and enhances each line electronically, evening out the volume levels, and then sends the electronic voice signal out to each listening ear. With teleconferencing services, everyone participating sounds just like they would in 1 to 1 phone calls. The teleconferencing services allow hundreds of people to be connected in a single call. The participants first need to dial into the bridge. The conference call company gives the call host a special dial-in service number. The host distributes that number to the participants. At the pre-arranged time, participants dial in and join the business conference.