UI (User Interface)3-326 AT Commands Reference Manual June 30, 2008
OK
atd44345678;
OK
>Long press on the headset dual-position button:
> The call is continuing.
>Call to the unit:
RING
RING
>Short Press on the headset dual-position button:
RING
>Long press on the headset dual-position button:
RING
AT+MHDPB=?
+MHDPB:(0,1)
OK
AT+MH DPB ?
+MHDPB:1
OK