ZyXEL Communications MAX-306M1 User Manual page 157

After you hear the ring signal or the second party answers it, hang up the phone.
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USA Three-Way Conference allows you to make three-way conference calls. To
do so:
When you are making a call, press the flash key to put the call on hold and get a
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dial tone.
Dial a phone number to make a second call.
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When the second call is answered, press the flash key to create a three-way
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conversation.
If you want to separate the three-way conference into two individual calls (one
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call is online, the other is on hold), press the flash key. The first call is online and
the second call is on hold. Pressing the flash key again will recreate the three-way
conversation. The next time you press the flash key, the second call is online and
the first call is on hold.
Hang up the phone to drop the connection.
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User's Guide
Chapter 13 The Phone Screens
157