Hunt Group Service - Patton electronics SmartWare R.3.20 Software Configuration Manual

SmartWare Software Configuration Guide
interfaces IF-BRI0 up to IF-BRI3. All four ISDN interfaces lead to the same provider. Since the call router
does not know the load on the BRIs, it has to be able to try BRI0 and, if BRI0 already serves two calls, use
BRI1, and so on.
interface sip IF-SIP
The hunt group service accepts a call routed to it by a routing table or directly from an interface and creates
another call that is offered to one of the configured destination interfaces.
The interface tried first (IF-BRI0) may drop the call telling the service that the interface has no resources to
handle the call (e.g. no circuit channel available). Note that only the call between the hunt group and the des-
tination interface is dropped, while the original call between the SIP interface and the hunt group service
remains connected.
The hunt group then decides to try the next destination (IF-BRI1), which in turn also drops the call due to
unavailable resources. In our example the hunt group then tries the third and eventually the fourth destination.
When an interface accepts a call, the interface hunting is complete and the hunt group service merges the orig-
inal with the new call to the interface that accepted the call.
You can influence the algorithm of the hunt group by several configuration commands. You can specify
whether the hunt group shall always start with the same destination interface or whether it shall immediately
try the next one in a round-robin fashion. This is called cyclic operation mode.
You can specify a timeout after which the next destination interface is tried when there is no answer at all from
the destination interface.
You can specify drop causes that trigger hunting for the next destination. All other causes (e.g. user busy) will
drop the original call.
Call router configuration task list
Context
Call Router
first routing table routing table
i
a
j
b
c
k
route
route
execute
a A
b B
mapping table
Figure 61. Hunt group service
33 • Call router configuration
interface isdn IF-BRI0
interface isdn IF-BRI1
route
route
interface isdn IF-BRI2
route
hunt group
service
route
interface isdn IF-BRI3
423