User`s guide

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99-07-15 G
268/155 34-ASB 150 02 Uen
FACILITY DESCRIPTION
Faktaansvarig - Subject responsible
SUPPLEMENTARY SERVICE
CALLINGLINEIDENTIFICATION
RESTRICTION (CLIR)
DEFINITION
The supplementary service CLIR enables the calling
party to prevent presentation of its ISDN number to the
called party.
USE
For outgoing external calls this feature is used to
conceal one’s own identity from the called party.
OPERATION
Outgoing calls
System telephones
There are two alternatives at outgoing calls to restrict
the representation of the A-number at the B-party
(number secrecy).
Permanent mode:
(command 0149 number secrecy = YES)
The extension is configured to always restrict the
presentation of the A-number. At call setup, BTU-D /
BTU-B_ / MFU informs the public network to restrict
the A-number at the B-party.
Temporary mode:
(command 0149 number secrecy = NO)
A "number secrecy“ key can be programmed at system
telephones, and the user himself may decide whether
or not to restrict the presentation of A- number at the
B-party.
This key is at the same time also used for the COLR-
function described in a later chapter. For A-number
restriction at the B-party, the key "number secrecy“has
to be activated before call setup. Restriction is
activated until the key is pressed again.
LED-status of the key “number secrecy“
Extinguished = A-number is presented at the B-party.
Steady light = A-number is restricted at the B-party
Note: No matter which mode - temporary or
permanent - is activated, it will always have an
effect on a subscribed COLR function.
(see chapter’ supplementary service COLR’)
ISDN terminals
By programming it is defined whether or not ISDN
terminals on the S-interface are allowed to use the
CLIR/COLR function, how the CLIR function will be
activated, depends on the terminal type used (see
userguide).
Incoming calls
System telephones
If the A-party has activated CLIR, the A-number is
restricted and a special information is presented on the
display of STANDARD, EXECUTIVE and OPERATOR
telephones.
STANDARD
EXECUTIVE
10 Feb 14:40 +15˚
DISPLAY REST C
10 Feb 14:40 +15˚
DISPLAY RESTRICTED CALLING
directory redial prog