IM blocker or logger

[zetsway]

Currently our business uses Google Talk which I advise our CEO to move away from it. So I was able to get OpenFire (jabber) working so we can use on an enterprise scale. However, Google Talk uses the same port as OpenFire so I really don't want to block that port.

Is there a way I can capture the traffic and filter it like barracuda IM or can I use squid to capture the traffic?

I'm really looking for a free solution but if this is the case then I will go with barracuda IM.

Thanks,