Three-Way Calling allows you to add a third party to your conversation.
Dial your first call. Press the hook switch or flash key to place the first call on hold.
Listen for dial tone. Dial second phone number. When the second person answers, you may speak privately to the second person while the first call is on hold.
To create a three-way call, press the hook switch or flash key once again.
Note: One of the calls must originate from your phone line.