DISA PIN authentication length

Hi,

is there a way to set up the maximum length of PIN code in DISA configuration page?

I have to avoid to insert ‘#’ character because my Iphone doesn’t not recognize it in preffix dialer.

I’ve manually changed extensions_additional.conf in “Authenticate(XXXX,4)” but every time I save my configuration via web interface this file is overwritten, loosing my changes.

Thanks!!!