Iptables string matching not working in newest Distro version

We recently upgraded to distro version 10.13.66-16 Released 09-14-16 and after the reboot Iptables string matching is no longer working as it should.

e.g. The string below used to work and now it doesn’t
-A INPUT -p udp --dport 5060 -m string --string “INVITE sip:” --algo bm -j ACCEPT

However this works
-A INPUT -p udp --dport 5060 -m string --string “INVITE” --algo bm -j ACCEPT

I see it’s running iptables v1.4.7
Anyone aware of any changes in the iptables version used in the distro or anything else that could affect string matching in iptables?

Is the Schmooze (centos) kernel compiled with Netfilter “String match support” enabled?