What do u mean? Change a digital extension to an analogue one? Well, first of all, u have to know what boards are for digital and analogue extension, ie, ELU 28 for digital and ELU 29 for analogue. Next is to inititate an analogue extension, EXTEI:dir=????,cat=?,equ=(BPOS of the individual).Make your question clear and I'll see if I can help.