This attribute specifies the type of hunting algorithm that should be
used by the VoiceRoute and VoiceSubroutes when selecting a
channel to make an outgoing call.
bottomUpLinear means that a call from the subnet will be passed to
the lowest instance of the VoiceSubroutes, which in turn will pass
the call to the lowest instance of SwitchedVoiceService. If there are
no available SwitchedVoiceServices in that VoiceSubroute then the
process will be repeated for the next lowest instance of
VoiceSubroute.
topDownLinear means that a call from the subnet will be passed to
the highest instance of the VoiceSubroutes, which in turn will pass
the call to the highest instance of SwitchedVoiceService. If there are
no available SwitchedVoiceServices in that VoiceSubroute then the
process will be repeated for the next highest instance of
VoiceSubroute.