Avaya VSU's

Anybody else use Avaya VSU's? We are having a heck of a time with speed at
our remote sites. Our ISP's at the remote sites are giving us as much Up as
well as Down as they can give but still having very bad problems with
speed/bandwidth. Can anybody give me an idea of what a person should expect
in percentage in terms of how much loss/overhead a person can expect over
VPN?


Thanks,

Chad Heskett
IT Infrastructure