ECHO OFF
C:
             
:ISDN_START
if EXIST ETELCHK.EXE goto START_CHK
goto ISDN_ENDE
             
:START_CHK
ETELCHK
if ERRORLEVEL 3 goto ISDN_NT
if ERRORLEVEL 2 goto ISDN_TE
if ERRORLEVEL 1 goto ISDN_CONFIG
goto ISDN_ENDE
             
:ISDN_CONFIG
if EXIST ETELCON.EXE goto START_CON
goto ISDN_ENDE
             
:START_CON
CALL ETELCON
goto ISDN_START
             
:ISDN_TE
TE
goto ISDN_ENDE
             
:ISDN_NT
NT
goto ISDN_ENDE
             
:ISDN_ENDE
REM EXIT