A terminal may receive individual half duplex calls which are either Direct Set Up (no need for the user to respond) or Hooking calls (which require that the user responds). On receiving an individual half duplex Hooking call the terminal will either vibrate or an intermittent audible alert will be generated, or both. On receiving a Direct Set Up call an alert will be generated for a very short time. The terminal status text will change to “PTT Call” and the LED will flash red if the call is a Direct Set Up call, or amber if the call is a Hooking call. The screen will change showing the TPI (Talking Party Identity).
In the case of a Hooking Call the user may choose to answer the call by pressing the PTT button or to reject the call by pressing the red telephone key.
If the call has been accepted, then either party may end the call by pressing the red telephone key.
The terminal status text will then change to “Ready” and a high low audible tone will be generated.
Dial modes are configurable, and as such, it is possible that the dial modes will not follow exactly what is described above.
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The sequence of events involved in making a full duplex call, with the associated screen shots is as follows:
Either enter the Phonebook menu, use the fast access keys to select a Phonebook entry or dial the required number using the keypad.
TETRA calls Select the correct dial mode icon using the up and down arrow
navigation keys as required. PABX and PSTN Calls
Press the green telephone key.
The terminal status text will then change to “Dialling”.
This will be followed by “Calling” and the terminal will then generate a ringing tone indicating that the called party is ringing.
When the called party answers, the terminal status will change to
“Talk”.
During duplex calls, the Duplex microphone (at the base of the hand-held terminal) and the Duplex Earpiece (on the front of the hand-held) are active, allowing the terminal to be held against the head like a telephone handset or GSM ‘phone. The LED is illuminated green throughout the call and there is no need to press the PTT.
If an audio accessory is being used simply press the green telephone key and continue fully hands free.
To end the call, press the red telephone key. The terminal will generate a varying alert tone to indicate that the call has been cancelled.
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On receiving an incoming full duplex call, the terminal will vibrate or generate a telephone ringing alert, or both. The terminal status indication will change to “Telephone” and a CLI box (Calling Line Identity) will indicate the call originator’s identity.
If the terminal can match the incoming CLI with an identity or telephone number in its Phonebook, then the text label associated with the number will be displayed as the CLI.
The user can choose to answer the call by pressing the green telephone key or to reject the call by pressing the red telephone key.
If the user answers the call the terminal status will immediately change to “Completing”.
At this point the call has not been connected, but the user has confirmed to the network that they wish to accept the call. Once the network has finalised the connection, the terminal status will change to “Talk”. The terminal should be held against the head as with a telephone handset or a GSM ‘phone. The user should speak with the mouth near the Duplex microphone and should not press the PTT button.
To end the call, press the red telephone key. The terminal will generate a double high low tone to indicate that the call has been cancelled.
When the call is cancelled by either party, the other party will hear a call disconnect tone indicating the call has ended.
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UPLEXDue to operational needs the user may wish to answer an incoming full duplex call as a half duplex call. This could be due to high ambient background noise levels where a full duplex call could pick up too much background noise for clear communications.
Upon receiving an incoming full duplex call, the terminal will vibrate or generate a telephone ringing alert, or both. The terminal status indication will change to “Telephone” (only visible in Normal Text mode) and CLI (Calling Line Identity) will indicate the call originator’s identity.
To answer the call the user should press the PTT button. The terminal status will immediately change to “Completing” and then to “Talk”. The user should then press and hold the PTT while speaking, as for group calls and individual half duplex calls.
To end the call the red telephone key should be pressed. The terminal will generate a varying alert tone to indicate that the call has been cancelled.