Hello - I run Centos 6 on many firewalls and am able to turn of the SIP helpers 
by running
rmmod nf_nat_sip
rmmod nf_conntrack_sip

I have a firewall running CentOS 5.9 and Shorewall 4.6.13.2-1.
In CentOS5, I'm unable to run /sbin/rmmod nf_nat_sip because it says ERROR: 
Module does not exist.

Is there a different way to turn them off in CentOS 5?  Am I looking at trying 
to disable the SIP helpers the wrong way or do they simply just not exist in 
CentOS 5.9?  We are having audio issues and every time it is fixed disabling 
those when CentOS 6 is our firewall.  I'm trying to not have to take this site 
down for rebuilding with 6 so just thought I'd ask.

Thanks!

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