Programs like Teamspeak typically let you hear several people at once - I'd say the limitation is the available download bandwidth of the server - obviously if the server cannot "hear" everyone, it cannot transmit to all of the listeners.

Go find a public TS server and give it a go. http://www.goteamspeak.com/

Thanks BuBBy. Although I do know that Yahoo allows for both webcams and audio to a group with what they call "Invite to a Conference" feature. Although I don't think up to 20 can use voice at the same time. Although I am not sure.

http://help.yahoo.com/l/us/yahoo/messenger/messenger8/chat/chat-18.html

So how does TeamSpeak 2 work. Can you hear everyone mixed together? Or does it only allow one to speak at a time? Yahoo I seem to recall you can hear everyone. Although the ones that were doing the talking (either push to talk or voice activated) maybe can't hear. I can't remember anymore.

Either ventrilo or TeamSpeak should be able to handle 20 users without a problem (assuming the server can handle the bandwidth).

We run a TeamSpeak 2 server and on occasion have had around 20 users at once and we have had no issues.

I know for a fact that TS2 is free for non commercial use. The license file for ventrilo comes with the download. You'd have to check but ventrilo is probably free for non-commercial usage also.

@ BillW50 - TS & Ventrilo are a type of VOIP chat server. Unlike IRC and AIM etc the method of communication with these chat programs is talking rather than typing.

Existing chat servers are no good? Like IRC, Yahoo, AIM, etc? I dunno, that is why they are there for I thought.

Alright... I have recently made a clan for America's Army and I need a chat server like ventrilo or TeamSpeak for free.. It has to be at least a 20 man server. anyone have any clue on what program to use or anything like that?