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©2001 Nokia Mobile Phones. All rights reserved. 11
• Support for analogue extension and trunk interfacing
• Loop reversal and loop interruption (detection and generating)
• Country specific R-key settings
Application module functionality
The application module can function in different modes when the Nokia 22 is
connected to a PBX. For further information, see “ Functionality in trunk mode”
on page 24 and “ Functionality in extension mode” on page 25.
Call creation
When the PBX or the telephone set connected to the Nokia 22 switches over to
the OFF-HOOK state, the terminal generates a local dial tone.
When the user makes a call, dialled digits are first saved in the memory of the
Nokia 22. The dial tone stops after the first digit is dialled. A four seconds wait-
ing time follows after the last dialled digit. After that the terminal assumes the
telephone number is fully dialled, and a call request is sent to the network. The
call is processed.
A local busy tone will be heard after 30 seconds and a howler tone after 60 sec-
onds if digits are not dialled. In such a situation before a number can be dialled,
the PBX or the telephone set must switch over to the ON-HOOK state and after
that again to the OFF-HOOK state.
Note: When making a call, an area code must be dialled for both local
calls and long distance calls if the network system does not support lo-
cal area dialling or the AAC (Automatic Area Code) feature is not in use.
For further information about the AAC feature, see section “ Automatic
Area Code (AAC) and routing” on page 16.
Note: The generating of dial tones does not depend on the service state
of the GSM terminal. Even if the GSM terminal is not connected to the
GSM network (that is light indicator 3 is blinking on the terminal) the
application module tries to connect the call. Thus, emergency calls can
be made using any network service provider available or even without a
SIM card in the terminal. For a description of the terminal light indica-
tors, see “ Light indicators”on page 12.