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On Cisco devices, SIP-ALG is referred to as SIP Fixup and is enabled by default on both routers and Pix devices. Because this is a default setting, no indication of it being “on” or “off” is visible in the configuration.

To disable SIP Fixup, issue the following commands:

General Routers

no ip nat service sip tcp port 5060
no ip nat service sip udp port 5060

Enterprise-Class Routers

no ip nat service sip tcp port 5060
no ip nat service sip udp port 5060