CSF Firewall is blocking audio when using Follow Me

[RustBoy]

We have been using CSF firewall with Elastix 2.2.0-14 for a couple of years with no issues. Recently we updated CSF and now when a Follow Me call is sent to an external number we are unable to hear the caller.

Can someone please tell me what I need to modify in the CSF settings to make this work again?

 

[JordanLCN]

Look up the logs of CSF to see whats being blocked and then just allow that.

 

[RustBoy]

Thanks. We discovered that our SIP provider had changed/added an IP address that was being used to route calls to the outside lines by the "follow me" feature. Once we added this to the whitelisted IP's it worked normally.