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. May 27, 2013 at 19:54

2 Answers 2


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.

  • 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
    May 27, 2013 at 23:26

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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