Kenwood KRC-178RG - Manual (Page 7)

Shut down the audio system temporarily whenever an
incoming call is received.
The function will not work if a cable is not connected to the car
phone.
When the telephone rings:
When a call is received, "CALL" is displayed and all the unit
functions are temporarily interrupted.
Restoring Original Unit Source During Phone Call:
Press the SRC button.
"CALL" disappears from the display, and the volume of the
original source is restored gradually.
Turning TEL Mute Function Off After Phone Call:
Hang the phone up.
"CALL" disappears from the display.
The original source (i.e., the one used before the phone call) is
returned to automatically, and the volume restored gradually.
NOTE
TEL Mute
"FAD" : Adjust the fader level.
Setting values: Front 15 – Rear 15
"BAL" : Adjust the balance level.
Setting values: Left 15 – Right 15
"TRE" : Adjust the treble level.
Setting values: - 8 – + 8
"BAS" : Adjust the bass level.
Setting values: - 8 – + 8
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"DB" : Recalling the kenwood preset sound setting
Press the preset buttons (#1-5).
Settings: #1;FLAT, #2;ROCK, #3;POPS, #4;JAZZ, #5;EASY
You can call the following settings with this function; bass
centre frequency, bass level, bass quality factor, bass extension,
treble centre frequency, and treble level setting.
NOTE