asterCC released asterCC ver 1.1-beta1, it gives a free full featured IP PBX features with no account , time or any other limitation.
download url: http://cn.astercc.org/
benefits:
1. a hosted system, many companies could work on same system
2. support billing and invoice, easy to manage by ITSPs
3. power privilege control, easy to config outbound permission
4. web based conference system
4. web based conference system
5. easy to upgrade to a call center
features:
1. trunk
2. outbound route
3. inbound route
4. ring group
5. voicemail
6. voicemail to email
7. recording
8. busy/no answer/unavaiable call forward
9. transfer
10. coloring ring back
11. call pickup
12. call hold
13. blicklist/whitelist
14. DND
15. music on hold
16.multi-language
17. IVR
18. queue
19. call group
20. rate
21. invoice
22. conference
please go to http://wiki.astercc.com for more details