Regarding N way calling

Hi,

I am completely new to asterisk system and i need you help me in configuring nway call in my trixbox…

I have set up a DID using IPKALL number and outbound VOIP route from fastvoip.com…Now DISA is working fine…

My requirement is Phone X calls my IPKALL number and X will be directed to DISA so he can dial outbound numbers…Now X can dial Y(Y is not an extension but a external mobile phone) and I want Y to go in to conference and then Either X or Y can dial some more external particpants and they can join the conference…

This page gives all the details but i dont know which code to add in what file and what changes i have to make in my trixbox for this to work…Hope you will direct me

http://www.voip-info.org/wiki/view/Asterisk+n-way+call+HOWTO

Thanks
Jey