Place or receive a call. Two parties are now on the call.
While you are on the first call, press Conference.
Listen for the dial tone. Dial the third party, wait for that party to answer, and press Conferenceagain to complete the three-party conference call.
Optionally, repeat steps 2 and 3 to add a fourth party.
At least one part must be internal. The conference ends when the last internal party hangs up.
To place your part of a conference call on hold, press Hold. The other parties can talk to each other, but they cannot hear you. (Music on Hold is not played.)
To transfer a conference call, see Transfer a Call.
To drop the last person whom you added to the conference (for instance, if the called party's telephone is answered by someone else, press Feature + 431.