When this attribute is set to yes and the DS1 or E1 line is set to
Channel Associated Signaling (CAS) mode, a 'busy-out' signaling
condition is transmitted onto the voice timeslot associated with this
Framer when its path across the network is down. The busy-out
code transmitted is given by the seizeCode attribute. If
transmitBusyYellow is set to yes on a CAS-based interface,
seizeCode must be set. When transmitBusyYellow is set to yes and
the DS1 or E1 line is set to Common Channel Signaling (CCS)
mode, a yellow alarm condition is transmitted onto the DS1/E1 line
when the path across the network associated with this Framer is
down. Note that in CCS mode, a yellow alarm condition is
transmitted when the path is down for any of the Framers with this
attribute set to yes.