Sepura SC21 Series, Руководство пользователя

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example, you might make a group call, but the actual call being established
might be converted to an individual call to a dispatcher.
This feature is typically used by network administrators to provide centralised
control over certain services (e.g. customising all the radios so that Alarm
Calls are all the same type and destination, allowing the network to decide
what type of call is made and the destination whenever an Alarm Call is
initiated).
When your call is modified you are alerted with specific visual and acoustic
alert indications, to make you aware that a new type of call is being
connected. The call continues as per any normal call of the new type, and the
icons and information elements displayed inform you about the type of the
ongoing call.
Once the call is established, the characteristics of the new call are the same as
those of any call of that type. For example, if the new call is half-duplex, you
need to press PTT before starting to speak, releasing the PTT allows other
parties to take the speech item, and the top microphone and half-duplex
loudspeakers are used.
Tip: When a radio is worn attached to your body, a half-duplex to full-
duplex call modification can be difficult to handle (since the latter is a
telephone-type call). To overcome this, your radio can treat the full-
duplex calls (resulting from a half-duplex call modification) as if they are
half-duplex calls, i.e. using PTT before speaking and releasing it to hear
the other party. (
Making individual phone calls (full-duplex mode) on
page 71 .)
Changing the behaviour of the PTT during TMO
group calls
Your radio may be customised to allow you to talk back on your TMO
selected group even if you are currently receiving a group call from another
talkgroup being scanned by your radio.
When enabled, pressing the PTT when in a received group call will start a
new call on the radio's selected talkgroup, allowing you to participate in that
call whilst monitoring your current scanlist activity.
There are two options:
User Guide
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