
     The  S10 register tells the modem how long it can lose carrier  before
disconnecting  from  the  remote device.  The default is  14  (S10=14)  1.4
seconds. If you have trouble with what appears may be loss of carrier,  try
increasing  this register. S10=30 or S10=50. (3 or 5 seconds). If  you  set
S10=255 it will not (at least in theory) ever hang up by itself on loss  of
carrier.
                                   Don Hinds - Zoom Tech

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