VOIP No Calls Need to Clear States Pfsense 2.7CE

[periko]

Hello.
I have a issue with a current PBX system running Isabel(Asterisk) behind a Pfsense 2.7CE. This behavior didn't exist before with PfSense 2.6, this after we update the box.
We don't have any extra services that could cause this on our Pfsense, is physical on a Xeon Box with 16GBRAM and SSD disk.

As u can see in the picture, we receive calls (inbound) from a Avaya system over a MPLS link, those packets reach pfsense and latter they move from our WAN1 to VLAN100 to reach our PBX system.

The problem we have is went we don't get any calls, pfsense once finish that communication after a while, if we get a call won't cross and we have to clear states and restart channels on our PBX.

This is how we found pfsense for that connection, we receive packets but won't cross any more.

I sniff the traffic and I can see packets arriving pfsense but won't get calls.

During that state, we can communicate from our MPLS side because we access other systems, the issue is the calls.

Looking for some tips u can share and see if we can fix this or some else we can do maybe we have a bug here.

Thanks for your time!!!