User`s guide

SkyTrac Systems Ltd.
Document Rev. 01.007 DOC0102 Page 12 of 23
Restricted Proprietary and Confidential Information
The user will hear a normal telephone ring when the call connects.
4.2.1 Address Book Dial
The Phone Menu also has an option to browse through the Address book and select a
number to call. Select Addr Book from the Phone menu. Use the arrow keys to scroll
through the address book to the number that is to be dialled, then press the Send button.
The up and down buttons will scroll through one by one, and the left and right keys will
move through the address book ten entries at a time.
Address Book entries 1 through 9 can be speed dialled using the hotkeys on the keypad.
Press the number of the entry and press Send to initiate a speed dial.
4.2.2 Manual Dial
To dial a phone number, go to the Manual Dial Menu and enter the number using the
keypad, then press the Send key.
An international number as described above must be dialled regardless of the location of
the aircraft.
A phone number can also be manually dialled from home the Home menu by simply
entering the number on the keypad and pressing Send.
4.2.3 Redial
The Phone menu has a ‘Redial’ option. Also, pressing the ‘0’ key followed by the Send
button will place a call to the last number dialled.
If there is no last number stored, the CDU-250 will display an error message. The last
number dialled is erased when the CDU-250 restarts.
4.2.4 Incoming Call
In order to dial the ISAT from the ground, an international number must also be dialled. The
country code for the Iridium Satellite network is 8816 or 8817. To dial an international
number, dial the International Direct Dialling (IDD) prefix of the country being called from
(011 for Canada and the US) then the destination country code (8816), followed by the
ISAT’s number.
Example: 011 8816 3101 0616
When a call comes in to the ISAT, the CDU-250 Activity indicator will illuminate and an
audible ring will be heard on the headset. The CDU-250 Display will also show a message
indicating an incoming call. If installed, the optional external buzzer will also sound.
To answer an incoming call, press the Send button. When the call is answered the Activity
light becomes solid and the display will update the current status of the call.