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How would I disable SIP on an Cisco router running IOS 12.x?
Depending on which version of 12.x you're on, you should be able to do the following:
router(config-sip-ua)#no transport tcp
router(config-sip-ua)#no transport udp
This stops the router from listening on port 5060.
If you mean how to disable the SIP ALG you can configure the following:
no ip nat service sip udp port 5060
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