AASTRA 4223 Professional for BusinessPhone User Guide - Manual (Page 85)

85 BusinessPhone — Dialog 4223 Professional / Dialog 3213
ISDN Facilities
ISDN Facilities
This chapter is only relevant when your system is connected to a
digital trunk line (ISDN-trunk line). It provides a general view of all
the (supplementary) services available from the public net which are
supported by the system. The services from the public net differ
from market to market. Please ask your system administrator
which features are available.
Number Identification
The main difference compared to the analog public net is the
number identification between the connected parties.
When you establish an outgoing external call, the public number of
your system and your extension number will be sent to the called
party. If the number of the answering party is different from the
dialled one (for example, after a diversion), you will also be informed
about the answering party’s number.
When you answer an incoming external call on your phone (or from
another phone), you will see the caller’s number on the display.
Your public number will be sent to the caller.
If a name is available to the external caller‘s number in your system,
it is shown alternating to the number. (Please contact your system
administrator whether the feature ’Name presentation for external
calls’ is available in your system)
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