very few techs have the time or desire to share the little that we know.
the most important cls marks are usually endding in a, nortel allow
hta hunt allow (busy treatment)
fna forward no answer (ring no answer treatment)
hfa handsfree allow
mwa message waiting allow
tdd tandem digit display
lna last number allow
the 1st class mark controls outside access to a point,
unr unrestricted
ctd conditionally toll denied
fre fully restricted
those three along with ncos and tgar control access to numbers AFTER you dial ac1 or ac2 (usually 9) ac2 is seldom used as it's not needed for full control anymore.. as the 1st post stated software i/o guide, book one of three, ld 11. i would recogmend reading cls marks as well as avaible key assignments.. i think a customer always needs maint, but should be able to do at least software changes, if not physical moves
john poole
bellsouth business
columbia,sc