Modem connection by mobile with LN 6.5

Hi to allsomeone of my user, when are they out of office, connect to domino server by mobile phone. But while this connection work proprely with LN 4 & LN 5, with LN 6.5 it doesn’t work. The laptop made the call trought mobile phone, it made the call too but after 60 seconds it return “call time expired”.

With version 4 & 5 i used “Generical all speed modems (with instruction)” as modem type.

Someone can help me?

Thanks