Nortel Networks 3100 - Manual (Page 53)

Advanced functions
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Figure 14: Place call prefix
8. Press the green Call button or from the menu, select Call.
The enterprise telephony system calls you at the contact location you
specified.
9. Answer the call.
10. The enterprise telephony system calls your friend at the contact
location you specified.
11. After your friend answers, you connect and the conversation can
commence.
To use the telephone keypad during a call (for example to respond to
voice mail prompts), switch to the telephone application on your Nokia
device.
To reject an incoming call, use the Nokia End call button.