Hi,
I can do it. It includes:
1. installation of asteirsk
2. installation of MySQL db
3. installation of Apache for web
4. installation of a2billing(AGI, diaplans and db)
5. configuraiton of callback from a2billing(script)
6. configuration of a demo trunk, call plan for testing
I have 5+ years of asterisk and a2billing experience so I can do more installation for you. Installation of a2billing can be done during 2-3 hours.