Well there's a few ways of going about this. This is more of a Java programing question than a CCX question though.

One of the easier ways would be to just create a String-type variable with a comma separated list of values you want (e.g.  myString = "8900,6767,8742,8812"). From that you can use the Java .indexOf(String str) method to find the pattern you want within the variable.

Example:

Set myString = "8900,6767,8742,8812"

Set callingNumber = "6767"

If (myString.indexOf(callingNumber) >= 0)

  True

    Your logic here.

  False

    Your logic here.

Essentially, the indexOf method will return an integer value of the first occurrence within the String variable of the given pattern. In this case you don't care about this, what you care about is what happens if it doesn't find that pattern. In that case it returns a -1 value.

Most people use a Switch (Match Case) statement here and just list out the individual matching conditions they want. Without knowing the use case it's hard to tell you what the best way forward is.