Longshine LCS-8156C1 - Manual (Page 108)

AT Commands for CX930xx Modem Reference Manual
3-84 Conexant 102752B
%J10 - V.23 forward channel mark & space
Command syntax:
%J10
%J11 - Bell212A originate
Command syntax:
%J11
%J12 - Bell212A answer
Command syntax:
%J12