BlackBerry Support Centre

Here is list of action control when you are using Wireless Headset. BlackBerry phones support Bluetooth wireless technology, giving you a plethora of wireless headset options.You can complete the following call tasks when your headset is paired and connected with your device.
Read the Action depend on Call control button

• Make a call please to Press and hold until you hear 1 beep. Say a voice command.

• Answer a call you must Tap 1 time
• Answer a second call,Tap 1 time
• Return to the first call or switch between calls please to Press and hold until you hear 1 beep.
• Join two calls, Press and hold until you hear 2 beeps.
• End a call please to Tap 2 times
• Turn on mute : Tap 1 time When mute is turned on, your headset beeps periodically
• Turn off mute : Tap 1 time
• Ignore a call : Tap 2 times
• Redial the last phone number  : Tap 2 times
• Turn on pairing mode please to Press and hold for 5 seconds and Cancel pairing mode just Tap 1 time.
• Clear pairing list by Press and hold for 6 seconds while sliding the power switch to the On position.

Wireless headsets cost considerably more; they can be found starting at around $30 for the most basic setup.