User's Guide

Mobile radio audio control
The mobile radio supports the concept of a single controlling audio accessory
for a call. The controlling audio accessory is the one in control of the call, and
the only one on which the microphone becomes active.
Tip: When a fist microphone or hands-free kit is used, the received audio
is directed to the loudspeaker connected to the mobile unit. When a
handset is used, the received audio is directed to the handset earpiece.
The controlling audio accessory is normally the Remote Microphone used in
conjunction with the loudspeaker, i.e. the hands-free kit or ‘Public’ mode. To
make a different accessory become the controlling accessory, press the PTT
button on that accessory or by take it off hook. If the new controlling
accessory has an earpiece then normally this is used for received audio
instead of the Loudspeaker (‘Private’ mode).
When in ‘Private’ mode you can switch to ‘Public’ mode by pressing the
hands free soft key (if configured). Taking a handset off hook, or using its
PTT will return to ‘Private’ mode.
While the controlling accessory is not the Remote Microphone, you may
switch to another accessory by pressing the PTT button on that accessory.
Taking that accessory off-hook does not change the controlling accessory.
This allows a second user to listen to received audio on another accessory.
If the controlling accessory is placed on-hook this clears the call unless
customised differently. Other accessories can be put back on-hook without
clearing the call in progress.
All earpiece audio is left on all the time in order that multiple users may listen
to the received audio.
User Guide
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