Technical data

System Networking 3-197
Chapter 3: System Features
MBX IP Description / Operations & Programming Guide
Under normal circumstances, the Central MBX IP system controls devices in the Local MBX IP
System. However, should the WAN connection between the Central system and remote
devices fail, the Local MBX IP-System will assume Call Server responsibility for the local
devices. The Local MBX IP-System provides local survivability and may provide PSTN back-up
service (Fail-over) for internal calls that normally route over the WAN, based on configuration.
Under certain operating conditions, this equipment cannot be relied upon for Emergency calls.
Alternative arrangements should be made for access to Emergency services.
CONDITIONS
- A VOIB channel in the Vertical-MBX IP System is required.
- In a Centralized Network, the maximum number of channels available is the maximum
number of channels supported by the central MBX IP system.
- In a Centralized T-NET, miscellaneous functions (Relay support, MOH, BGM, Alarms
and External Page) are not supported.
- When NAPT or other firewall functions are implemented, packet relay for RTP packets
is required; packet relay requires VoIP channels for each simultaneous call desired.
- The local MBX IP System will take over operation of registered devices if the Central
office does not respond to three consecutive poll attempts over a period of 10-102
seconds; once connection to the WAN is re-established, the central office will
automatically re-gain control.
- The MBX IP system can be installed behind a NAPT, however Fixed NAT-Port
forwarding is required for the host to be reachable using remote devices.
OPERATION
System -- Operation of Centralized Network is automatic when configured and defined.
ADMIN PROGRAMMING
T-Net Data
T-Net Attributes (PGM 330) … see details on page A-147
PGM 330 BTN RANGE DEFAULT
T-NET ENABLE -- enable T-NET function. 1 0: Off
1: On
Off
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Release 1.0
November 2010