Block (Google Talk - Skype - Lowrate VOIP)

Dear All

Currently Im facing problem blocking some Communication and chatting programs like (Google talk  Skype  Low Rate VOIP) I have bluecoat proxy which have smart filter installed on it also
Firewall facing the internet I successfully blocked MSN and yahoo messenger but I fail on others so any good Idea about this.

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Google Talk:
Block  the following TCP port 5222, and TCP port 443.  
Skype is hard to block due to its p2p nature we handle it by removing the program itself and setting policies in AD that prevents users from installing it, Download skypekiller its a free program that scans your lan and tells you what clients have it installed. you can download that here
Lowrate Voip
Block the following
SIP port : 5060 Registrar : Proxy server :

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DlalaAuthor Commented:
Thanks Dear

i try the first option for google talk but it's not working forSkype and lowrate i will try it using my firewall
please if there is any other solution for google talk please inform me
DlalaAuthor Commented:
DlalaAuthor Commented:
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