AASTRA DT292 for MX-ONE User Guide EN - Manual (Page 54)

During Calls
DT292 54
Conference
With this procedure you can include up to seven parties in a
conference. Only the conference leader (i.e. the person initiating the
conference) can admit participants. During the conference a tone
will be heard every 15 seconds.
Note: The conference tone might be disabled for your
system.
You have an ongoing conversation and want to establish a
telephone conference. You will become the conference leader. »
Press.
Dial tone. Z
Call the third party.
Wait for answer. 3
Press to establish a conference.
Repeat the procedure to add more conference members. Ъ Щ
End the call to leave the conference.
Note: A tone burst is heard each time a participant enters
or leaves the conference. When the conference leader
leaves the conference, the conference will continue with the
other included parties. The conversation is changed back to
a normal two party connection when there is only two
parties left.