You could use a service with a JAVA ap for VOIP, such as Glophone's Glo2go.
Put a shortcut on your page for the loading page.
http://www.glophone.com/content/glo2go_express.aspx
****************
WARNING!
DO NOT login to Glo2Go Express if you are using the same PC on which your
GloPhone software is installed.
Doing so will cause Glo2Go Express to replace your GloPhone
*******************
This can be used on PCs when downloads/ installations are restricted, such
as library computers.
"Josef Wagner" <> wrote in message
news:423755bb$0$6882$...
> I would like to use my VOIP account on every computer in any internet cafe
> of the world.
> For that I am searching for an free web frontend, which I can implement in
> my homepage.
> Does anybody know such a solution or even has experiencein using such an
> front end.
>
> Thanks for Your help
>
> Josef
>
>