Risks of Conference Calling

Because you cannot see the people who are involved in the conference call, it is possible for a person to call into a conference call and eavesdrop. A chime sounds when a new person joins a conference call, but if the person mutes his phone, then the other participants will not be aware that somebody is listening in. Only a person with the bridge number can gain access to a conference call, so eavesdropping can only happen if somebody gets a hold of the bridge number and knows when the conference call is scheduled.