Changing returned message from router when using ACL

Unanswered Question
Dec 18th, 2007
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I configured a few voice routers that are directly exposed on Internet. They have access-lists that denies all the sip and h.323 traffic. When I'm scanning the router for example with nmap (syn scan) I get message that the port is open (administratively filtered). I just want to deny any responses on that ports like the and hide my router at all. Is there a way to do that?

The IOS version is 12.4-3h and the router is Cisco 2811.

Thank you in advance.



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