System Functions and Features as of I7.9
Routing elements
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4. 2. 1
Trunk Groups of Network Interfaces
General Rules and Settings
A network interface can only be assigned to a single trunk group.
A trunk group contains either analogue or digital network interfaces (the network
interface entered first is decisive).
The digital network interfaces of a trunk group lead either
•
to the permanently networked PISN if
Network type
=
private
is set,
•
to the public network if
Network type
=
public
is set.
The following rules apply to the setting of the transmission protocol (
Protocol
) for
the network interfaces of a trunk group:
•
Trunk groups with
Network type
=
private
are usually set to the PSS1 (QSIG) pro-
tocol.
•
Trunk groups with
Network type
=
public
are set to protocol DSS1.
Tip:
It is advisable to enter network interfaces that have the same destina-
tion in the same trunk group, for example to set up one trunk group for
the public network, one trunk group for PINX 1 and one trunk group
for PINX 2, etc.
Initialization Settings
Newly set up digital network interfaces are automatically entered in trunk group 1.
Trunk group 1 is set to
Network type
=
public
and
Protocol
=
DSS1
.
Newly set up analogue network interfaces are automatically entered in trunk
group 2.
Trunk group 2 is set to
Network type
=
public
.
Seizure Sequence for Outgoing Calls
Within a bundle the system will first try and seize the network interface that was
entered last (large numbers). If for whatever reason this interface is not available, it
will then attempt to seize the second last interface, then the third last, etc. (see also
).
This is repeated for each outgoing call using the same principle. This means the call
charges tend to accumulate on the network interface entered last.
