Version : AT610-UG-SIP-V1_7_600_284-D20120515-EN.z
A/ When the earphone is connected to the IP phone , incoming call rings from earphone.
B/ Call Service page adds Mute Mode option. When in Mute Mode, there is no ring tone for incoming calls 
but only the LED blinks.
C/ Call Service page adds Missed Call LED option. When this item is selected, LED doesn't blink for missed 
calls but only the missed call icon will show on LCD
D/ Call Service page adds Auto Handdown option. When this item is selected and headset is in use, 
if the other side hangs off, the IP phone will get back to standby status.