Avaya NN43113-101 - Manual (Page 222)

While on an active call
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Figure 32: 3-way Call
Note 1: If you receive a new call during a 3-way call, you can answer
the new call as usual. The IP Deskphone automatically puts the 3-
way call on hold. If you want to join the new caller to a 3-way call, you
must initiate a conference call with the server and join all callers to the
conference call.
Note 2: If the host of a 3-way call presses the hold button, all callers
in the 3-way call are put on hold.
Note 3: If the host of a 3-way call presses the Goodbye fixed key or
selects Release Call from the Action menu, all calls in the 3-way call
are terminated.