Im trying to sync my headset to my nortel m3904. the headset base is blinking red at the headset is blinking blue. When I try to use the headset instead of my handset it doesn't work at all. Please help

SOURCE: Avaya 6424D+M handset / headset

What equipment do you have? You might need an adaptor.

Is this fixed?

SOURCE: plantronics voyager 510 headset

Make sure the headpiece is charged. Turn the headpiece off by pressing the little black button on top of the earpiece and holding for about 5 seconds. Turn the earpiece back on again the same way. You should have a slow flashing blue light on the mic boom. The base station will now try to find the earpiece and within about 20 seconds the red light on the base should be steady and blue light on top should be on.
If this doesn't work you may need to manually pair the earpiece to the base by pressing and holding the Listen Volume Adjust + Button and headset Call Control Button on the earpiece until the light on the mic boom flashes red and blue repeatedly. As above, the base station will now try to find the earpiece and within about 20 seconds the red light on the base should be steady and blue light on top should be on.

SOURCE: plantronics 222 problem please help!

Make sure it is fully charged then hold the button down and don't let go till it flashes blue/red. You will see it turn blue first but still hold down the button till like I said it flashes blue/red.

SOURCE: Trying to connect Plantronic 220

Hi,
1.First switch on the bluetooth in mobile phone.Keep the headset switched off.
2.Now press the call button for 2 seconds if you are paring this headset for first time,If this head set is aired already with another mobile press for 8 seconds until the headset status indicator begins to flash blue then red
3.Now search the bluetooth by your mobile device.It detects and you can pair it
Thank You

SOURCE: Plantronics voyager 500a ~ Trying

http://plantronics.custhelp.com/cgi-bin/plantronics.cfg/php/enduser/std_adp.php?p_faqid=8165&p_created=1128461658