B2B based voip

Hi everybody,
I'm looking for directions to make a web based voip application
I'm based on an Instant messaging application made using Ajax (so I've gat presence infos) and my next step aims to allow conversations between members.
I did some searches on google but all I got is wengo , busta , flash server based applications , but all I need is a free audio flow between 2 browsers. so to summarize :
-how to retrieve audio from mic and compress It? (f.i with a light firefox plugin)
-how to exchange this (RTP?) flow between the two members (sockets in xpi application?).

i'm not looking for st to dial numbers or call sip addresses ,just a basic model between two browsers (B2B or P2P).

Thanks in advance.

another one is mozphone but it is not sip.



<AutoEdit By System>Please do not post ALL CAPS. Thanks </AutoEdit>

thanks,
but It seems a little complicated,as I'm not a mozilla programmer.
I didn't find a way to the codecs parts and where they catch voice from the mic.same for the reception part (catch sent data and play It)

dibsmft :

Another one is mozphone but it is not sip. <AutoEdit By System>Please do not post ALL CAPS. Thanks </AutoEdit>

I dont recall there be other than caps at the start of the line. Odd?

jdar :

thanks, but It seems a little complicated,as I'm not a mozilla programmer. I didn't find a way to the codecs parts and where they catch voice from the mic.same for the reception part (catch sent data and play It)

Its easy to load and set up - just follow the instructions. It works well with Free World Dialup. For me, that is about it as I only use SIP.

Ok thanks for your answers
I'm gonna give It a try,see what I can find.
But I want also to know, is there any other "soft" way to get audio from computer , lighter than xpi extensions?

or maybe directly from the browser , with no installation
st like a library for JavaScript...

Flash excluded no money investment in this project