code: public boolean isSipURI() {
      if ((message == null) || (((Request) message).getRequestURI() == null)) {
        return false;
      }
  
      return ((Request) message).getRequestURI().isSipURI();
    }
docs: Indicates if the request URI in the request message is a URI with a scheme of "sip" or "sips".
  
  @return true if the request URI scheme is "sip" or "sips", false otherwise.