The signaling type of E&M tie trunk interface.
winkStart - the calling side seizes the line by going
off-hook on its E lead but waits for a short
off-hook 'wink' indication on its M lead from
the called side before sending address
information as DTMF digits.
immediateDial - the calling side seizes the line by going
off-hook on its E lead and sends sends address
information as DTMF digits.
delayDial - the calling side seizes the line by going
off-hook on its E lead. After a timing interval,
the calling side looks at the supervision
from the called side. If the supervision is
on-hook, the calling side starts sending
information as DTMF digits; otherwise, the calling
side waits until the called side goes
on-hook and then starts sending address
information.
lmr - the e&m port is used to interface with
Land Mobil Radio system. The e-lead and
m-lead are not used in the traditional
way.
fgd - Feature Group D is an access switched services
that provides access to Local Exchange Carrier
of the public switched network. It is supported
in North America only based on E&M wink-start.
fgd-eana - Exchange Access North American signalling
protocol of Feature Group D.