AASTRA 4187 Plus for BusinessPhone User Guide EN - Manual (Page 31)

31 BusinessPhone – Dialog 4187 Plus
During Calls
Conference
You have an ongoing conversation and you want to establish
a telephone conference. ¸
Press.
z
Call the third party.
¸ 3
Press to establish a three party conference.
Now you have established a three party conference. To indicate the
conference, all conference members will hear a periodical
conference tone.
Repeat the procedure to include other persons in 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. d
Replace the handset to leave the conference.