Here's a short script I wrote to read in a Maximus log file and separate those
annoying "Caller dropped carrier" sessions caused by internet port scans.

Filename: proc_cdc.vbs
   Shell: Cscript, VBScript
Platform: Any operating system with Windows Scripting Host (WSH) installed eg.
          Windows XP/2k/2k+[3,8]/Vista/7. You can get WSH for Windows9x & NT.
 Purpose: All BBS call log entries with only "Caller dropped
carrier" in them
          are filtered to separate files eg. %filename%.cdc & %filename%.log.
 Assumes: The log files to be processed do NOT have *.log or *.cdc extension.
          The system for which this script was written writes Maximus log files
          to "node%1.tmp" where %1 is the node number.
   Input: Any Maximus log file
  Output: Deletes input file and creates *.cdc (for Caller Dropped Carrier) 
          and *.log (Other). 


proc_cdc.vbs: 
===============================================================================
Option Explicit

Const ForReading = 1, ForWriting = 2, ForAppending = 8, CreateIfNotExist = 1
Const DEBUGGING = False

Dim objFileLogfileCdc
Dim objFileLogfileNode
Dim objFileLogfileNodeTmp
Dim strLogfileNode
Dim strLogfileNodeTmp
Dim strLine, strLineBuf, strLineBufType
Dim intPos
Dim intLineCount
Dim i

' Get node%1.tmp filename
strLogfileNodeTmp = WScript.Arguments(0)

' Get node%1.tmp base filename 
intPos = InStr(1, strLogfileNodeTmp, ".", vbTextCompare)
strLogfileNode = Left(strLogfileNodeTmp, intPos - 1)

' Open files for reading and/or appending

Set objFileLogfileNodeTmp = OpenTextFile(strLogfileNodeTmp, ForReading)
Set objFileLogfileNode    = OpenTextFile(strLogfileNode &
".log", ForAppending)
Set objFileLogfileCdc     = OpenTextFile(strLogfileNode &
".cdc", ForAppending)

'
' Process node%1.tmp
'

Wscript.Echo WScript.ScriptFullName & " running ..."

intLineCount = 0
strLineBufType = ".log"  ' Initialise default line buffer type
Do While objFileLogfileNodeTmp.AtEndOfStream  True
  strLine = objFileLogfileNodeTmp.ReadLine
  strLineBuf = strLineBuf & strLine & vbNewLine

  If RegExpTest("MAX  Begin, v3.01", strLine) Then
    ' Reset line count and string buffer at beginning-of-call
    strLineBuf = strLine & vbNewLine
    intLineCount = 1
  ' An empty line signals end-of-call so flush string buffer to the correct log file
  ElseIf RegExpTest("^$", strLine) And intLineCount > 1 Then
    Select Case strLineBufType
      Case ".log"
        If DEBUGGING Then
          Wscript.Echo "Writing to " & strLogfileNode &
".log:"
          Wscript.Echo strLineBuf
        End If
        objFileLogfileNode.WriteLine strLineBuf
        strLineBuf = Null
        intLineCount = 0
      Case ".cdc"
        If DEBUGGING Then 
          Wscript.Echo "Writing to " & strLogfileNode &
".cdc:"
          Wscript.Echo strLineBuf
        End If
        objFileLogfileCdc.WriteLine strLineBuf
        strLineBufType = ".log"  ' Reset back to ".log"
just to be sure
        strLineBuf = Null
        intLineCount = 0
    End Select
  End If

  ' Check every third line for CDC
  If intLineCount = 3 Then
    If RegExpTest("MAX  Caller dropped carrier", strLine) Then
      strLineBufType = ".cdc"
    Else
      strLineBufType = ".log"
    End If
  End If
  
  intLineCount = intLineCount + 1
  
  If DEBUGGING Then 
    If i > 100 Then  ' Look at this number of lines only
      Exit Do  
    End If
    I = i+1
  End If
Loop

objFileLogfileCdc.Close
objFileLogfileNode.Close
objFileLogfileNodeTmp.Close

If Not DEBUGGING Then
  DeleteFile(strLogfileNodeTmp)
End If

Function OpenTextFile(strPathFilename, intMode)
  Dim fso, fd
  Set fso = CreateObject("Scripting.FileSystemObject")
  Set fd = fso.OpenTextFile(strPathFilename, intMode, CreateIfNotExist)
  Set OpenTextFile = fd
End Function

Function RegExpTest(patrn, strng)
  Dim regEx, retVal               ' Create variable.
  Set regEx = New RegExp          ' Create regular expression.
  regEx.Pattern = patrn           ' Set pattern.
  regEx.IgnoreCase = True         ' Set case sensitivity.
  retVal = regEx.Test(strng)      ' Execute the search test.
  RegExpTest = retVal
End Function

Sub DeleteFile(strPathFilename)
  Dim fso, f
  Set fso = CreateObject("Scripting.FileSystemObject")
  Set f = fso.GetFile(strPathFilename)
  f.Delete
End Sub
===============================================================================


Example RUNBBS.BAT:
===============================================================================
set LOGFILE_NODE=node%1.tmp

max -n%1 -l%LOGFILE_NODE% -e0 -b%2 -s%3 %4 %5 %6 %7 %8 %9

if errorlevel 255 goto UndefError
if errorlevel  16 goto Error
if errorlevel  12 goto EchoMail
if errorlevel  11 goto NetMail
if errorlevel  10 goto localmail
if errorlevel   5 goto Aftercall
if errorlevel   4 goto Error
if errorlevel   3 goto Error
if errorlevel   2 goto Done
if errorlevel   1 goto altx

:Done
rem ; Clean up log file by removing "Caller dropped carrier" 
cscript %max%\scripts\proc_cdc.vbs %LOGFILE_NODE%
===============================================================================


--- Maximus 3.01