code: public static CallerId valueOf(String s)
      {
          final String[] parsedCallerId;
  
          parsedCallerId = AstUtil.parseCallerId(s);
          return new CallerId(parsedCallerId[0], parsedCallerId[1]);
      }
docs: Parses a caller id string in the form
  <code>"Some Name" &lt;1234&gt;</code> to a CallerId object.
  
  @param s the caller id string to parse.
  @return the corresponding CallerId object which is never <code>null</code>.
  @see AstUtil#parseCallerId(String)