Hitachi ZW 310-6 Operator's Manual page 220

Handsfree (A special Bluetooth® unit is necessary to use this
function.)
 Allows handsfree conversations when using a Bluetooth
(HFP protocol) compatible cellphone.
Item
Incoming call  Talk
Talk  End call
Reject call
Redial
Incoming Calls (A special Bluetooth® unit is necessary to use
this function.)
 When a cellphone is connected via Bluetooth and a call
comes in, "CALLING" is displayed on the screen, regardless
of the band (or operation) at the time, and the speaker rings
with the call.
 Even if the source of the radio unit is OFF, when a call
comes in, the source automatically turns ON, "CALLING" is
displayed and the speaker rings with the call.
 If the call is rejected, it does not transition to talking and
returns to the band (or operation) before the call.
 Pressing [PRESET] button (6) while talking toggles the
microphone OFF/ON.
The voice of the speaker is muted when the microphone is
OFF.
Microphone OFF is canceled after each call.
Redial (A special Bluetooth® unit is necessary to use this
function.)
 Regardless of the band (or operation) at the time, long
pressing the [SRC] button causes "DIALING" to be displayed
on screen and the sound from dialing to be played on the
speaker.
 Even if the source of the radio unit is OFF, when the redial
function is used, the source automatically turns ON, and it
shifts to the redial process.
 The redial function redials the number of the last incoming
call since the ACC was turned ON.
 The redial function may not work if the length of the
previous incoming call was short.
AUX
 Only available for machines equipped with an audio input.
Use this function at an appropriate volume.
OPERATOR'S STATION
When a call comes in, press any of the buttons:
[SRC], [DAB], [MODE], [PTY], [UP], [DOWN], [PRESET].
During the call, press one of the buttons: [DISP], [POWER].
When a call comes in, press one of the buttons: [DISP] or [POWER].
Long press the [SRC] button when the key switch and/or the ACC is ON.
Operations
Receiving
Call
End Call Cut Off
Receiving
Call
End Call Cut Off
1-154
Incoming Calls
End Call Cut Off
Normal Screen
MPTC-01-062
Redial
Long Press
Calls the last number
called on the cellphone.
End Call Cut Off
Normal Screen
MPTC-01-063
MPTC-01-064