[Example VoIP Network]
PBX-1
Network
ID 1
PBX-3
PBX-2
PBX-4
IP-GW
IP Network
Idle
4001 NDSS
Busy
4001
Idle Busy
Network
ID 2
Idle
4001 NDSS
Busy
Mixed Network
When using the NDSS feature over a mixed network containing both VoIP portions and ISDN line portions,
it is possible to set whether status information will be transferred between VoIP and ISDN cards within
each PBX. For example, if the monitor PBX is on a VoIP network, and monitored PBXs are on an ISDN
network, the PBX that acts as a gateway between the VoIP and ISDN networks must have this setting
enabled for ISDN to VoIP.
4. Network Monitor Extension Registration [Monitor PBX]
Register the extensions (attached to other PBXs) that will be monitored. A maximum of 250 extensions
can be registered. Only extensions that have been registered here can be assigned to NDSS buttons.
11.4 [9-4] NDSS Key Table— Network Extension No.
Network Monitor Extensions Table
Index No. Network Extn. No. Network Extn. Name
001 2001 Branch 1: T. Jones
002 2002 Branch 1: M. Davidson
003 4001 Branch 2: R. Powell
: : :
250
When using the PBX Access Code numbering method, the relevant access code must be added before
the extension number registered here.
5. NDSS Button Customization [Monitor PBX]
At any extension attached to a monitor PBX, customize a flexible button as an NDSS button for an extension
registered above. Then go off-hook, press this button once, and go on-hook again. This activates the
monitoring function. The monitored PBX will begin to transmit information about the status of that extension,
and the monitor PBX will begin to receive the information. The button light will display the status of the
extension connected to another PBX.
Removing or Editing a Registered Extension [Monitor PBX]
To monitor a new extension when 250 extensions are already being monitored, it is necessary to remove
the registration of an existing extension.
The NDSS Monitor Release feature is used to stop monitoring a certain extension. When this feature is
performed at a monitor PBX:
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13.1.15 Private Network Features—NDSS (Network Direct Station Selection)