Ericsson DT288 User Manual page 21

During Calls
Transfer to a busy extension
You can even transfer calls to busy extensions. The other party
will hear a muted signal (camp-on), and the call will be extended,
as soon as the ongoing call is terminated (if camp-on is allowed).
Call-back
You are called back, if you have transferred an external call and
the other extension has not answered the call within a certain
time. Your telephone will ring again.
Conference
You have an ongoing conversation and you want to establish a
telephone conference.
Press
Dial tone.
Call the third party
3
Press to establish a three party conference
Now you have established a three party conference. To mark the
conference, all conference members will hear a periodical
conference tone.
Repeat the procedure to include other persons to the
conference
In this way, you can include up to six parties in a conversation.
How many of them can be external callers depends on the
programming of the system.
Press to leave the conference
BusinessPhone - Portable DT288 21