Sepura SC21 Series, Руководство пользователя

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Calls
The various types of voice and data calls that are supported by your radio,
and the acoustic and visual alerts that accompany a call, depend on your
radio's customisation.
Call types
Sepura radios support the following voice- and data call types:
Voice call types
Voice call type Description
Group
A call between you and a group of other radio users in
your attached talkgroup. A group call is always a half-
duplex call. Users can join and leave the call at any time.
Group calls are initiated by pressing the PTT button. See
Talkgroups and folders on page 43 .
Individual
A call to another user or dispatcher in the TETRA
network, or to an external telephone subscriber via the
Gateway. Full-duplex and half-duplex calls are
supported.
Individual calls to outside the TETRA network can be
made between a terminal or a dispatcher and a telephone
subscriber in a network to which the TETRA network
has a gateway interface. These calls are always full-
duplex. A full-duplex call is one in which both parties
can speak at the same time. The
Select/Send and
Cancel\Home keys are used to initiate and end calls.
In a half-duplex call only one person can speak at a time
and needs to press the
PTT button.
PBX
A call to a user on a private branch exchange (PBX). This
call needs to be set up by your service provider and
allows you to call a person by dialling their extension
number (preceded by a programmed digit used to dial
the exchange).
PSTN
A call to a user on a the public switched telephone
network (PSTN).
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SC21 Series – 07/2017