ZyXEL Communications LTE7410 User Manual page 112

When you are on the phone talking to someone, press the flash key to put the call on hold and get
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a dial tone.
Dial a phone number directly to make another call.
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When the second call is answered, press the flash key and press "3" to create a three-way
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conversation.
Hang up the phone to drop the connection.
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If you want to separate the activated three-way conference into two individual connections (one is
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on-line, the other is on hold), press the flash key and press "2".
Chapter 14 VoIP
LTE7410 User's Guide
112