Audio Conferencing using Cirrus?

Hi there -
I'm interested in building a small website for my company's development team. This is the scenario that I would like to achieve:
1. Colleague enters website
2. Colleague presses "Connect"
3. Colleague is connected with any other colleagues that have pressed "Connect"
4. Any colleagues Connected can chat using only a microphone I do not wish to support video feed
5. Full duplex communication is supported between all colleagues
Is this something I can achieve using Cirrus? If not, do you have any idea what technologies exist that could make this achievable?
I have found the following website:
http://www.speakfreely.org/
This seems to do exactly what I want, but I need to create a web service out of this without forcing my colleagues to download something to their computer.
Any tips would be appreciated. Thank you for your time!

My ReelPortal app does just that, except it also have video (which you don't have to turn on). Here's a short description:
ReelPortal is a video chat and conferencing software. Designed to work with multiple devices and OSes (Windows, Linux, MacOS, Android, BlackBerry Tablet, etc), its features include:
* Video conference with multiple friends
* Create your own private rooms
* Supports both p2p and client/server connections
ReelPortal is room-centric. You automatically connect to everyone in a room when you enter it. No need to call them individually.
You can run it directly from the web browser on the PC/Mac/Linux, at www.reelportal.com. You can even download the server, and run it within your own intranet. But if you don't like it, you can certainly implement your own via Flash/AIR.
As for audio quality, using headset is probably the best, but if you really need speakerphone, I'd suggest get a decent Bluetooth Speakerphone, like the Motorola EQ7 or EQ5, at a very affordable price.

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http://www.cisco.com/en/US/products/sw/ps5664/ps5669/index.html
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6789/ps5664/ps5669/data_sheet_c78-693132.html
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