RBF ,You are correct in that some dictation equipment do not interface well with a certain brand PBX . I had problems with a ROLM 9000's reorder tone which was basically the digits * # being repeated over and over . The dictation system saw * # as forward and reverse. We had to revise the Rolm 9000 software to correct that issue . However all this dictation card wants to see is either a wink being sent or an open loop current for 500ms or longer . I do think Sandman's device will work .

Let It Be , I live in a Yellow Submarine . SCCE