Assumes that all 3 field types are in each block of data
As a thought, I added an optional format you can consider
Private Sub CommandButton1_Click()
Dim myFile As String, text As String, textline As String, FileNum As Long
Dim outRow As Long
outRow = 1
myFile = Application.GetOpenFilename()
FileNum = FreeFile
Open myFile For Input As #FileNum
While Not EOF(FileNum)
Line Input #FileNum, textline
If Left(textline, 4) = "LEN:" Then
ActiveSheet.Cells(outRow, 1).Value = Trim(textline)
ElseIf Left(textline, 8) = "SIP_URI:" Then
ActiveSheet.Cells(outRow, 2).Value = Trim(textline)
ElseIf Left(textline, 14) = "SIP_SUBDOMAIN:" Then
ActiveSheet.Cells(outRow, 3).Value = Trim(textline)
outRow = outRow + 1
End If
Wend
Close #FileNum
End Sub