[Asterisk-Users] Conference solution for 100+ users

[Sergio Veltri]

Hi List,

I am looking for some advice. I need to come up with a conference
solution that will allow users to join mainly to listen to a guy talk
about a product for an hour. My main concern is the client side. I
need people from within firewalls to be able to join the conference
with speakers built-in their laptops or computers. All I know is that
Skype works in most of the customers this guy will be addressing. I am
considering the following options:

1-Skype-like softphone for *. is there any?
2-Just do audio streaming and have the customers use windows media
player. (I dont know how to do this)
3-Use some kind of Softphone with VPN...
4- Do Softphone--->Port 80---> SER--->Asterisk w/meetme.

Whatever solution I come up with MUST allow anybody to listen in
assuming nobody can change firewalls.

Any one has already done this? Any feedback will be much appreciated.

Thanks,

Sergio