Escalate a call in progress to become a conference call
To add more callers to become a conference call you:
1 - During a call, from the In Call screen, select Menu, and then select Add Others.
2 - To add a new participant, enter their extension number or scroll through your contacts using the up & down arrow keys, highlight the desired person and press the Add button.
3 - You will get a message on your screen saying that the conference call is connecting, this may last a few seconds whilst the call is set up.
4 - Once connected, the display on your phone will tell you that you are in a conference call, how many participants there are and who they are.
5 - To add more participants, repeat the above steps.