AB1561 Headset Reference Design
User Guide
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2.3.7.4. Add call
The user can add the held call to the current calling.
Table 21. Add call
Functionality Actions Results Requirements
Add call
active call
2.4. Volume
This section shows the MMI functions related increasing or decreasing the volume of the speaker and microphone,
and how to mute or unmute the microphone.
2.4.1. Speaker volume
Users can adjust the sound level of the speaker.
Table 22. Speaker volume
Functionality Actions Results Requirements
Speaker volume
up
Continuously press key5 (PIO4) One short beep In connected,
incoming/outgoing,
call active states
Speaker volume
down
Continuously press key6 (PIO2)
incoming/outgoing,
call active states
Note: The speaker here is applicable to HFP, A2DP, depending on the scenario.
Note: When the volume reaches the maximum level, the user hears two short beeps and the voice prompt says
“Volume maximum” through the earphone.
2.4.2. Mic mute
The user can mute or unmute the microphone.
Table 23. Mic mute
Functionality Actions Results Requirements
Mic mute toggle Double-tap key3 (PIO5) Two short beeps and the
voice prompt says “Mute
on/off”
Only during an active
call
Note: When the microphone is muted, the voice prompt says “Mute on” and will periodically repeat saying “Mute
on” until the microphone is unmuted.
2.5. Music
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