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In the second scenario, while the radio receives individual calls and group calls, and replying to
individual calls is possible, replying to group calls is not possible.
2.5
Numbering and Addressing
Each radio has an Individual TETRA Subscriber Identity (ITSI) used for addressing the radio over the
air interface.
However, it is undesirable to require you to enter a long number to address another radio. To this end,
a set of short number schemes can be used. Alternatively, the radio can be provisioned to treat a short
number as a Short Subscriber Identity (SSI). This scheme can be refined to allow short dialing within a
fleet by combining the ID entered with the radio own SSI.
If the radio is provisioned to treat a short number as a TETRA SSI, and the number entered is fewer
than seven digits, the identity of the radio is combined with the number entered to produce the actual
Individual Short Subscriber Identity (ISSI). Using this scheme, an ISSI can comprise of a fleet number
part and a member part.
The ISSI of the radio is used to determine the leading digits for the digits omitted as in the following
scenario:
1 The radio has the following ID: 1234567
2 You enter: 890
3 The SSI sent is: 1234890
The following services can use the short SSI for identification of both the called and the calling parties:
•
Duplex private call
•
Simplex private call
•
Group call
•
Mobile status
•
Short data bearer service
•
Text message service
If you are provisioned with the capability of entering a real TETRA ISSI and you enter an ID of seven
digits, the number is interpreted as a real TETRA ISSI regardless of the short addressing scheme
used.
2.6
Dialing Methods
The radio supports multiple methods of selecting a number for an outgoing call.
The radio supports the following dialing methods:
•
Using predefined One-Touch Buttons
•
Dialing from the favorite folders
•
Dialing from the address book
•
Dialing from the Recent Calls list
•
Direct dialing
MN004527A01-AG
Chapter 2: Services and Features
19
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