A direct conference using the Cisco Telephone System allows a maximum number of 4 simultaneous video/audio participants. Sharing Desktops is currently not possible.

You can initiate a conference via the telephone as follows:

Step 1
Call the first participant.

Step 2
During the call use the physical conference button (12) on your phone.

The participant has been added to a new conference call. The initial call is put on hold.

Step 3
Add an additional participant to the call by typing their number using the search function.

Step 4
After entering the number, press the softkey below "Conference" to add the participant and add them to the conference call.
Repeat the process for a third participant.

If you want to add more than 4 (creator + 3 others) participants to a conference, you will get the following advice.