This attribute indicates the current total available bandwidth
reported to the hunt group server in the Availability Message Packet
(AMP). This value represents the sum of the sixteen currently
available egress bandwidth pools. It is the sum of the sixteen indices
of the FrUni Ca egressPoolAvailableBandwidth attribute.
It increments when a connection is released.
It decrements when a connection is accepted.
Both this attribute and the availableDlcis attribute must be non zero
for this interface to receive calls on a hunt group.