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1.20 Integrated Services Digital Network (ISDN) Service Features
184 Feature Guide
3. ISDN Centrex Service
An extension user can have access to the features of the ISDN Centrex Service of the
telephone company (e.g., Call Transfer). This is used by putting the current ISDN call on
hold by sending a flash/recall signal. This feature is enabled or disabled for each ISDN
port.
4. Private Networking Connection (QSIG)
Private networking with QSIG is possible using an ISDN line. The QSIG mode, Master or
Slave, can be enabled on an ISDN port basis.
5. ISDN Extension ( 1.20.1.11 ISDN Extension)
An ISDN (BRI/PRI) port can be used for extension connection. While the extension
connection is enabled, ISDN terminal devices (e.g., ISDN telephone, G4 fax machine,
personal computer) or a behind PBX can be connected to the port.
When the ISDN port is in P-P configuration, one ISDN terminal device can be connected
to the port. When the ISDN port is in P-MP configuration, a maximum of eight ISDN
terminal devices can be connected to the port. However, only a maximum of two devices
can be used simultaneously.
Conditions
• Overlap/En bloc
ISDN call dialling mode, Overlap or En bloc, can be selected for each ISDN port. When
"Overlap" is selected, the PBX sends each dialled digit individually. When "En bloc" is
selected, the PBX sends all of dialled digits at once after the extension user completes
dialling. The PBX recognises end of dialling as follows:
Call Hold
(HOLD)—by ISDN
Puts one ISDN call on hold. • 1.20.1.6 Call
Hold
(HOLD)—by
ISDN
Call Transfer
(CT)—by ISDN
Transfers an ISDN call to an outside party. Call
Transfer with Announcement and Call Transfer
without Announcement are available.
• 1.20.1.7 Call
Transfer
(CT)—by
ISDN
Three-party
Conference
(3PTY)—by ISDN
Establishes a three-party conference call using
the ISDN service of the telephone company.
• 1.20.1.8
Three-party
Conference
(3PTY)—by
ISDN
Malicious Call
Identification
(MCID)
An extension user can ask the telephone
company to trace a malicious caller. Information
on the malicious call will be received later on.
• 1.20.1.9
Malicious Call
Identification
(MCID)
Completion of
Calls to Busy
Subscriber
(CCBS)
If an outside called party is busy, an extension
can receive callback ringing when the called
party becomes free.
• 1.20.1.10
Completion of
Calls to Busy
Subscriber
(CCBS)
Service Description Details in