The dial-in lines available on SU-AI (SAIL) are these:

  497-0081  for 1200/150 split-speed modems
  324-9030  for 300/300 or 1200/1200 (Bell or Vadic) modems

On 324-9030, you must type one or more carriage returns after acquiring
carrier, so that the system can tell whether you are running at 300 or
1200 baud.  You should type carriage returns until you get back the
system dot prompt (".").

Each of the phone numbers above represents the first line in a group of
phone lines that automatically switch you to the first free phone line.
The lines in the first group are 497-008x for x=1,2,3,4,5,6,7,8,9,0.
The lines in the second group are 324-903y for y=0,1,2,4,5,6,7 (note: no "3").