A teleconference server may calculate a fully qualified number (FQN), which specifies a string of numbers that, if dialed by an calling party, will establish a call with a called party. The fully qualified number may include, for example, an external access code, an international access code, a country code, a national destination code, and/or a subscriber number. In order to determine a calling party and a called party, the teleconference server may access data regarding a scheduled call. The teleconference server may determine a fully qualified number based on the relationship between the called party and the calling party. The teleconference server may send the fully qualified number to the calling party, which may then initiate a scheduled call with the called party by dialing the received fully qualified number.