To ensure you receive all audio on your Flowroute calls, specific Port Forwarding/NAT policies should be put in place on your network. The following two Port Forwarding network address translation (NAT) policies are required:
RTP media (call audio): To reduce latency, Flowroute uses Direct Media. To receive Direct Media , allow UDP packets from any source IP address with a destination port within your system's RTP media port range; forward to your PBX's local IP address.
If you are using a Sonicwall firewall, pfSense firewall, or IP Tables, please see the following for specific configuration tips:
 If your Port Forwarding configuration allows you to specify the source IP of your SIP traffic, you can restrict traffic on port 5060 or 5160 to all of the following server IP addresses: New PoPs
 RTP media port range varies by phone system. Your system's RTP media port range will be configured locally on your system and/or detailed in your system documentation.