Samsung SMT-i3100 Owner's Manual page 14

Call Hold
Conference
Call Forwarding
DND (Do Not Disturb)
Paging
Phone Setting
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You can hold the call temporarily or transfer it to another person
using the call hold or call transfer function, if something urgent
happens during the call.
You can use this function to hold a conference through the phone
among several people at different locations.
When you cannot receive a call, you can transfer it to another
extension phone.
When you do not want to answer the phone, this function can prevent
the phone ringing even when a call is placed to it.
Using this paging function, you can make an urgent announcement
via other users' phone speakers, without calling individuals.
A user can set preferences for the phone.