1. The served user's (or controller's) reference to a particular party within the context of a call. Note 1: Multiple parties may be associated with a given call, e.g., a conference call. Moreover, there may be multiple connections associated with a single party, e.g., a simultaneous voice and video call. Note 2: This service description assumes that there exists only one connection to a given party. 2. In a teleconference, any participant.