Set Firewall Policies for Flowroute's Direct Audio
To ensure you receive all audio on your Flowroute calls, two specific policies must be put in place on your network's firewall:
SIP signaling (call control): Allow UDP and TCP traffic over port 5060 from the following server IP addresses: 184.108.40.206 as well as 220.127.116.11/28, 18.104.22.168/28, 22.214.171.124/28, and 126.96.36.199/28.
RTP media (call audio): To reduce latency, Flowroute uses Direct Audio. To receive Direct Audio, allow UDP packets from any source IP address with a destination port within your system's RTP media port range.
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