AASTRA 600d for Aastra 800 and OpenCom 100 User Guide EN - Manual (Page 84)

Telephoning
82
Three-Party-Conference
If your user group has the corresponding authorisation configured, you can conduct a
telephone conference (maximum of 3 subscribers). Conference participants can be
internal or external callers. Three-party conferences cannot be connected.
Initiate and end conference
Continuing call with conference participants individually
During a conference, you can speak to conference participants separately.
Initiate conference:
short Establish enquiry connection (see page 77).
When the subscriber answers, announce the conference.
Press softkey briefly.
/ Use the navigation keys to select the 3 Party menu entry and confirm
with the Ok softkey. The conference is initiated.
Ending conference:
Press softkey briefly.
… or
Press softkey briefly.
/ Use the navigation keys to select the 3 Party End menu entry and
confirm with the Ok softkey.
Press softkey briefly.
/ Use the navigation keys to select the Toggle menu entry and confirm
with the Ok softkey. Both connections are held and you can toggle
between the subscribers using the
softkey.