Custom Modem Setup for Telephone System Requirements

Telephone System Limitation or Problem       Hayes Solution                                



                                                                                           


Noise on telephone line causes modem to      Increase S9 setting: 


falsely detect carrier on line               Carrier Recovery Time                          


        



Modem connection broken due to noise spikes  Increase S10 setting: Lost Carrier-to-Hang-Up 


on the telephone line                         Delay                                          


   



Security problems with incoming calls        Decrease S10 setting; if S10 is set to 255,   


connecting onto prior host sessions -        the modem will not hang up when carrier is     


indicating that host can not reset soon 


enough.                                          



System needs to originate calls in answer    Issue the R command within a dial string      


mode for call-back security                  (Reverse mode)                                 


   



Telephone system is too slow to respond to   Increase register S11 setting: Tone dialing   


auto-dial DTMF (tone dialing) pulses         speed                                          




Business telephones (multi-line key systems) Check setting of &J command; use the


                                             &J1 setting with RJ-12 and RJ13 type phone


                                             jacks.                                         



System must be able to call past unattended  After accessing the PBX, issue the following  


operator positions                           dialing command modifiers: !(*;#)