Routing elements
115
System functions and features as of R3.0
syd-0367/1.3 – R3.0 – 03.2013
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
Fig. 48).
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.
BRI-S Interface as the Network Interface
An BRI-S interface set as external is also classified as a network interface and can be
assigned to a trunk group.
Note:
If an BRI-S interface is reconfigured within a trunk group (to ETSI or V2), it
is no longer a network interface and is removed from the trunk group.
B Channel Groups
The two user-information channels of a basic access and the 30 user information
channels of a primary rate access can be divided into 2 and 4 B channel groups (B
channel list setting
1)
). This classification is carried out only if, for example, not all the
B channels of the primary rate access are available. B channel groups can be sepa-
rately allocated to a trunk group, for example the primary rate access on network
interface 3.17 can be entered as follows:
• "3.17": All four B-channel groups are allocated to the trunk group.
• "3.17/2": Only B-channel group 2 is allocated to the trunk group.
Default: All B channels are in B-channel group 1.
Planning tips:
• B channels can only be grouped in sequence (e.g. channel group 1 contains B
channels 1 to 6).
• A B channel can only be allocated to one channel group.
• If the B-channel groups of a primary rate access are spread among different
trunk groups, the same protocol must be set for all trunk groups.
1)
Dividing up B channel groups is not supported by all network providers.
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