Aastra Dialog 4220 Lite User Manual page 22

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
second.
You have an ongoing conversation (Line 1) and want to
establish a phone conference. You will become the
conference leader.
Press.
Note: You can also press Line 2 or Inquiry
Call the third party.
Wait for an answer.
Press to establish conference
Repeat the procedure to add more conference
members.
Replace the handset 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 2 party connection when there is only two
parties left.
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