the LED is blinking. i even put LED to monitor the serial output, it is flickering. Modem ground is connected to PIC gnd.

neither
SerOut Tx,t300,["ATH1"]
SerOut Tx,t300,["ATH0"]
SerOut Tx,t1200,["ATH1"]
SerOut Tx,t2400,["ATH1"]
SerOut Tx,t9600,["ATH1"]

work, i not sure about line feed or carriage.There is no information about linefeed and carriage found in any modem articles, even hyperterminal doue not require that..

Anyway, let me try