This attribute determines how modem status lead information on a
V35 or V11 port is handled. When the value of the attribute is set to
on, line signal changes are passed transparently through the
network to the remote end of the connection, where they are passed
out on that end's outgoing leads. When the value of the attribute is
set to off, line signal changes are not transparently passed through
the network. Both ends must be provisioned to support this function
for line signal transport to work. It is highly recommended that line
signal interpretation is set to 'don't care' on the associated vport
component (ie. vport attributes readyLineState and
dataTransferLineState).