Opening these ports (UDP) and forwarding them to the IP address of your Vonage MTA device using your router can possibly help call clarity and connection issues.
RTP (Voice) Traffic: Ports 10000-20000 UDP. When a call is made, a random port between 10000 and 20000 is used for RTP (Voice) traffic. If any of these ports are blocked, you may experience one way or no audio.
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