1. While on an active call, press the More > Confrnc softkeys.
2. Dial the internal extension or external number to add to the conference.
3. Wait for the second party to answer, and then let them know that you would like to add them to a 3-way call.
4. Press More > Confrnc again.
*Softkeys are buttons located around the display whose function changes depending on the context. These keys are managed by your system administrator.