Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Network Engineering Stack Exchange is a question and answer site for network engineers. It only takes a minute to sign up.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
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
Required, but never shown