If u want to use voice chat there is also mumble witch is better than vent if u ask me, a free server can hold up to 100 person . And there is alot of nice feature not in vent.
http://sourceforge.net/projects/mumble/
Mumble Server :
| Name : Sadistik |
| Host: 66.131.54.186 |
| Port : 7070 |