You can do a conference call on your Gigaset cordless Dect phone by following the steps below:

1. Dial the first person you wish to speak with.

2. When that person answers press the 'Ext. Call' option you will see on your phones display.

3. Now dial the second number of the other person you wish to speak with.

4. When the second person has answered press the 'Conf' button and all three of you should be talking.  

Please watch the Gigaset video below which explains how to use conference calling from a Dect (cordless) phone.