Hi Pablo, both nf_conntrack_sip and nf_nat_sip use 7 different NAT hooks currently: they are exported by the conntrack module, then set by the NAT module at module_init() time. Quite some of this repetitive task can be avoided by introducing nf_nat_sip_hooks. SIP helper has been tested after applying this patch. Please check the following patch. /Holger -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html