[Serusers] how to install ser and configure it with voicemail

I have install ser-0.8.11-0.i386.rpm, mysql and serweb. My sip phone are all window messenger. When someone contact a user who is not on-line, you get this message:- phone(a)192.168.1.3 has declined your request to have a voice conversation. When I login 'phone' to serwweb as a subscriber, under missed calls is always empty & message store too. How to make it ring first and after a period go to voicemail if phone(a)192.168.1.3 is not online? I went through the document but got confuse. Do you have a example ser.cfg script that works. 2. Through the web documents there are 2 vm softwares sems-0.1.0-0.i386.rpm & ortp-0.6.2.tar.gz. which is the right one? 3. if vm is required must you reinstall ser? If yes, what to change in the makefile? Help! Thanks!