Internal Network Traffic Redirected to WAN why?

I have a FreePBX server Asterisk 13 running in our location and we have a remote office connected via VPN. We are both on a 10.240.???.??? LAN but when calling an extension in the remote office the server tells the client to redirect the traffic to the WAN IP. The calls do go through but I don’t understand why the server would be redirecting the traffic. Anyone else noticed this? Do I have something configured incorrectly? Any help or advise would be a big help.

When that happens usually that means that the traffic is getting nat’ed somewhere on your firewall device. Traffic that is meant for a remote site over a VPN should not be nat’ed before leaving your network.