@echo off
dmmodem
mode com2:96,n,8,1,p
echo at z s46=0 &q0 > com2
rem cls
echo.
echo A call
echo B answer
echo.
choice /c:ab Choose an option
if errorlevel 2 goto auto
if errorlevel 1 goto dial

:dial
echo atdt2566032 > com2
goto End

:auto
echo ata > com2
goto End

:End