6. How to use ................................ 236.1 Stereo/Mono headset overview6.2 Convertible headset overview6.3 Base overview6.4 Base status icons6.5 How to change language6.6 How to adjust the microphone volume fordesk phone calls6.7 How to reset7. How to make calls ................... 297.1 Basic call usage7.2 Merge calls7.3 Conference calls7.4 Transfer a call from desk phone to headset7.5 Transfer a call from headset to desk phone7.6 Transfer a call from mobile device to headset7.7 Multiple call handling8. How to change settings .......... 398.1 Basic settings8.2 Advanced settings9. Jabra Direct ................................ 489.1 Firmware update10.Support ....................................... 4910.1 FAQ10.2 How to care for your device10.3 Replacement accessories