[Serusers] Call routing

Any feedback from ser gurus.. ======================= Hi! I was able to install and make a call successfully. However, Im using number, for example 2222 as my login name and that will serve as my termination / extension number also. How can I define a specific or corresponding extension number to a specific user. for example, I use somebody as login name and I set 1111 as his extension number. With this information, I should able to login / register to my gatekeeper and using somebody as login name and my friends can call me using my 1111 voip number. Please help me if there something I need to modify on my ser.cfg Also I want to enable accounting. Please help.. thanks, ed