Load Balancing; Trunk Modes; Redundant Trunks; Activation Of Primary Trunks - Avaya IPBS1 Installation And Operation Manual

Load Balancing

Note: This section does not apply for the IPO PBX.
There are possibilities to configure several primary trunks to get a good load balancing in the
system. This means that call setups alternate between the active primary trunks. The first active
primary trunk has the highest priority.
If no load balancing is desired in the network, only one primary trunk should be configured and
all calls are set up on this trunk if it is in "Active" mode.

Trunk Modes

There are four different modes for a primary and redundant trunk.
Note: A primary trunk can never be set to Standby.
Active
Up
Down
Standby
A trunk that is "Active" or "Up" is correctly configured and correctly attached. A trunk that is
"Down" has a fault. Either in the configuration or the hardware (broken cable).
Fault finding can be to check that the IP-address is correct as well as to check the PCB and the
cable.

Redundant Trunks

Commonly one redundant trunk is configured as a backup. It is used if all of the primary trunks
are down.
If all primary trunks are "Down", the redundant trunks starts working. The redundant trunk will
get the status "Active" or "Down" depending if it works or not. If it gets the status "Active" the
calls will go through the redundant trunk until the primary trunks are activated again.

Activation of Primary Trunks

There are two ways of activating the primary trunk; Manual and Automatic:
Manual
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The trunk is up and accepts traffic.
The trunk is up but does not accept traffic as it is not set to "Active" mode.
The trunk is down and not working.
The trunk is ready to be used for redundant purpose.
Click on the "Activate Primary Trunks" button. (This button is only available if there is any primary
trunk in "Up" mode.)
The primary trunks then enters "Active" mode and the redundant trunks cease to be active and go to
"Standby" mode". (New calls go through the primary trunks and ongoing calls go through the
redundant trunks until the call is finished).
02/2016