You are speaking with someone, you wish to add another person to the call.  


1. Press the Conference key.


2. Enter the phone number of the person you wish to add to the conference


3. Press Dial


4. As soon as the person answers they are connected to the call. 


Please watch the Gigaset video below to see how to use conference calling from your desk phone:


http://www.youtube.com/watch?v=dN2Kl--R1WU