Dialling, Numbering

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Dialling, Numbering Addressing

• Ranko Pinter
• Simoco

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Agenda

• Definition of terms
• Dialling Man Machine Interface (MMI)
• Addresses and Identities
• Numbering and Addressing
• Call Scenarios

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Definition of terms(as used in this presentation)
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TETRA Dialling MMI
ID exchange between user and terminal)
Leading Digit dialling - ETR 300-5
Display scrolling
Number presentation (CLI TPI) with mnemonics
Soft keys
Special numbers e.g. 999/ 112
Mode keys
Full dialling
Man-Machine Interface MMI - ETR294
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TETRA Addressing
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Family of TETRA Addresses
(ITSI) INDIVIDUAL TETRA SUBSCRIBER IDENTITY
(ATSI) ALIAS TETRA SUBSCRIBER IDENTITY
HOME NETWORK
(V)ATSI VISITING ALIAS TETRA SUBSCRIBER IDENTITY
(V)GTSIs VISITING GROUP TETRA SUBSCRIBER
IDENTITIES
VISITING NETWORK
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TETRA Addressing Plan
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Numbering Addressing

• Numbering and Addressing Plans
• Basic Numbering
• Enhanced Numbering
• Leading Digit Dialling
• 4 Scenarios
• Home Foreign Network
• PABX E.164

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Linking TETRA Addressing Numbering
TETRA NUMBER
TETRA ADDRESS
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How many numbers for a TETRA Terminal?

• One Family of Home Network TSIs
• One Individual TETRA Number ITSI
• One Alias of individual Number ATSI
• One or more TETRA Group Numbers GTSIs
• One or more Families of Visiting Network TSIs
• One Visiting Alias (V)ATSI
• One or more Visiting Group Numbers (V)GTSIs
• One telephone numbers E.164.

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Basic TETRA Numbering

• Communication within one TETRA Network
• No need for algorithm selection
• Home dialling algorithm applies, viz.
• decimal value range from 0 to 16,777,215 (224)
• User may dial between 1 and 8 digits
• 7 digit with max value 9 999 999 recommended
• Decimal digits are converted to binary SSI
• Incorrect numbers are rejected.

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Enhanced TETRA Numbering

• Communication beyond one TETRA Network e.g.
  another TETRA, PABX, PSTN, ISDN
• Need for algorithm selection
• Selection of Dialling Algorithm
• Direct number entry via keypad, Mode selection
  buttons, Soft key menu selection, Leading Digit
  Dialling
• Two-stage dialling using DTMF.

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Leading Digit Dialling

• Leading Digit Dialling is the only dialling
  algorithm selection defined in ETR 300-5
• Recommended way to achieve commonality between
  manufacturers implementations
• Predefined value for E.164 gateway access is
  FFFFE0 (16,777,184)
• Predefined value for ISDN gateway access is
  FFFFE1 (16,777,185)
• 14 more values reserved for future use.

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Call Scenarios

• Call originating and terminating on same Network,
  
• Call originating and terminating on different
  Networks
• Calls between TETRA and PABX
• Calls between TETRA and E.164 (PSTN, GSM, TETRA!)

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Scenario 1- Home Network
TETRA
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Scenario 2 - Foreign TETRA Net
TETRA (UK)
TETRA (UK)
TETRA (France)
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Scenario 3 - PABX
TETRA (A)
TETRA (B )
ISI
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Scenario 4 - E.164 (PSTN, GSM)
TETRA (UK)
TETRA (Germany)
E.164 (PSTN, GSM)
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Conclusions

• TETRA dialling plans provide the benefits of
  flexibility and interoperability to meet the huge
  variety of needs of professional users
• TETRA numbering plans have flexibility to
  efficiently deal both with simple fleet numbers
  full E.164 international numbers
• TETRA addressing alignment allows for future
  interoperability/ roaming with GSM