Voip Problems after Upgrade from FG100D to FG100F

Hello,

2 wees ago we replaced a FG100D cluster for FG100F. We copied all VoiP rules for the external Voip provider.

Now we get some feedback from the local users that "sometimes" it takes lie 1-2 seconds before they can take the call and they did not have this issues lie 2 wees before.

the policies are the same, we deleted the session session helper so I think we should have the same situation.

Any ideas?

Thanks