Samsung Ubigate iBG3026 Configuration Manual page 674

CHAPTER 35. Call Admission Control
A user is able to create busyout class by using 'voice class busyout <tag>',
available tag is from 1 to 31, and add the busyout monitoring list used in
busyout class in voice class busyout configuration mode.
LVBO allows you to take a PBX trunk connection to the attached gateway
completely out of service when WAN conditions are considered unsuitable to
carry voice traffic.
This technique has the following advantages:
Not every call must be rejected individually and incur a postdial delay.
Prevents the need for hairpinning rejected calls back to the originating PBX,
using up multiple DS0 slots for a single call.
Works well to redirect rejected calls with PBXs that either do not have the
intelligence or are not configured appropriately.
Solves the hairpinning problem of the PBX putting the call back onto a
third DS0 on the same T1/E1 line to the gateway that has already rejected
the call and hairpinned it. CCS trunk types manage this hairpinning
problem because cause code information can be returned to the PBX that
triggers rerouting logic. However on CAS trunks the PBX does not know
what went wrong, and unless digits are manipulated in the gateway, the
PBX cannot easily make a decision to reroute the call over a different trunk
group.
LVBO provides the outgoing gateway with the ability to monitor the state of
various network interfaces, both LAN and WAN, and busy back the trunk to
the PBX if any of the monitored links should fail. Up to 32 interfaces can be
monitored; if either one of or all of the interfaces change state, the gateway
can be configured to busy back the trunk to the PBX. The reason this feature is
called local voice busyout is because only local links can be monitored.
This feature has no visibility into the network beyond the link of the local
gateway.
How to set LVBO
Convert Voice-port to busyout state by force.(busyout forced)
Convert time slots on E1/T1 trunk to busyout state by force.(ds0 busyout)
With specific conditions things can be converted to busyout by
monitoring.(busyout monitor)
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