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How would I disable SIP on an Cisco router running IOS 12.x?

  • Both Darren and Brett have answered below however it would be better to be a little clearer what you mean with future questions. – David Rothera May 27 '13 at 19:54
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Depending on which version of 12.x you're on, you should be able to do the following:

router(config)#sip-ua
router(config-sip-ua)#no transport tcp
router(config-sip-ua)#no transport udp

This stops the router from listening on port 5060.

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  • 2
    There's also TLS. Cisco actually has this documented in a security bulletin. To be absolutely sure, include an acl on internet (insecure) links. – Ricky Beam May 27 '13 at 23:26
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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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