You can also join an incoming call with an active call  
  While on a call with Caller A, you get a call from Caller B  
  To include Caller B, let A know you'll be right back with B  
  Press Answer softkey (This puts A on hold and answers B)  
  Press More softkey and Join softkey ; 
  Now everyone is together  
  Your display will show Conference  
 
When you are finished with the call and would like to disconnect everyone, press End Call.  
 
If you have the Executive Seat six-way calling feature, you may simply continue this process as 
needed.   
SIX-WAY CALLING   
If you have the executive seat, you have six-way calling. To create a six-way call:  
  Place your first call   
  Press Conference  
  Place your second call  
  Once it is answered, press More and press Conference  
  Press Hold 
  Press New Call  Place third call  
  When answered, press Join  
  Press Hold  
  Press New Call  
  Dial fourth call  
  When answered, press Join  
  Press Hold 
  Press New Call  
  Place fifth call   
  When answered, press Join 
When you are finished with the call and would like to disconnect everyone, press End Call.