There's a bunch of stuff missing from that log (like the src and dest, and what's congested, and who answered what), but that's not enough to trigger the firewall to block the host.
Assuming it's from the same IP address, that's not in a defined zone, and responsive firewall is on for traffic coming from that host, It's about half way there. The limits are explained here
http://wiki.freepbx.org/display/FPG/Responsive+Firewall
That's also far too slow for fail2ban to ever pick up on it, too. Which is why Firewall exists 8)