void imlInterp_JoinConference(object sender, ConferenceEventArgs e)
 {
     // If the line isn't in use, don't do anything
     if (telecomProvider.IsLineInUse(lineNumber))
     {
         LoggingService.AddLogEntry(LogLevel.Extended, "(Line " + lineNumber + ") Joining conference ID " + e.ConferenceID, false);
         telecomProvider.AddLineToConference(e.ConferenceID, lineNumber);
     }
 }