AT$H1 - Basic Result Codes

A        Immediate answer.                                           

A/       Repeat last command.                                        

Bn       Communications Options, ** See $H11 for Details.            

D        Dial the number that follows:                               

         Dial Modifiers: (W)= Wait for Dial Tone (,) = Pause         

         (!) = Hook Flash (@) Wait for Quiet Answer ($) Wait for Bong

         Tone (;) Return to Idle State (R) use answer mode           

         (P) pulse dial (T) tone dial (S) dial stored number         

DS=n     Dial stored number in location n (0-3)                      

En       Command Character Echo, 0 = No Command Echo, * 1 = yes      

Hn       Hook, 0 = On Hook, 1 = Off Hook                             

Ln       Speaker Volume, 0/1 = Low, 2 = Medium, 3 = High             

Mn       Speaker Control, 0 = Off, *1 = On until Carrier Detected, 2 

         = Always On, 3 = On except during dialing                    

Nn       Negotiate Handshake Options, 0 = originate and answer at S37 

         speed, 1 = originate and answer Interwork from S3, 2 =       

         originate Interwork from S37; answer Interworks from V.32,   

         use V.22.