■ Calls
To make a call, use your mobile device in the normal way when the
headset is connected to it.
To redial the number you last called (if your mobile device supports this
feature with the headset), when no call or music playback is in progress,
press the multifunction key twice.
To activate voice dialling (if your mobile device supports this feature
with the headset), when no call is in progress, press and hold the
multifunction key for about 2 seconds until the mobile device starts
voice dialling, and proceed as described in the user guide of your mobile
device.
To answer or end a call, press the multifunction key, or use the keys of
the mobile device. To reject a call, press the multifunction key twice
quickly.
To mute or unmute the microphone during a call when using Bluetooth
connectivity, press and hold the play/pause key for about 2 seconds.
When the microphone is muted, the Bluetooth indicator light flashes
blue twice every 5 seconds.
To switch a call between the headset and your connected device when
using Bluetooth connectivity, press and hold the multifunction key for
about 2 seconds.
To switch a call from the headset to the connected device when using
the audio cable, disconnect the CA-143U or CA-182U cable from the
headset. To switch the call back to the headset, reconnect the cable.