Bay Networks 5393 User Manual page 56

Release 5.1 Supplement for Remote Annexes
119346-A Rev. A
38
An SPB has three sections:
• A section presenting call setup criteria. If the SETUP message
that starts an incoming call meets all of these criteria, or if no
criteria are specified, the call is handled by this SPB.
• A call handling section that manages all calls meeting the SPB
setup criteria. This section specifies an action to be taken for
the calls.
• A section containing per-session port parameter settings. All
global port parameters can be overridden (as appropriate for the
specific type of call) in this SPB section. If you do not need to
change the value of a global port parameter, do not specify it
here - that is, if no parameter values are special to this session,
you can omit this section of the SPB.
How SPBs Are Scanned
When it receives a call, the Remote Annex tries to match the SETUP
information elements of the call with setup criteria values defined in the
SPBs. The Remote Annex searches SPBs in the order that they appear in
the configuration file, so the sequence in which you specify SPBs is
important. You should order your SPBs from the most specific to the most
generic.
When it scans the SPBs, the Remote Annex uses the first SPB whose
setup criteria are met by the incoming call. All criteria in an SPB must
be met by the SETUP information elements in order for the Remote
Annex to consider the SPB a match.
Once the Remote Annex finds a matching SPB setup criteria section for
a particular call, it:
• Handles the call as specified in the call-handling section.
• Uses the per-session port parameter settings to form the
dynamic parameter values that will be applied to the call.