2

Wireshark shows that an RTP package is received on a PC.

Is it possible that despite detection by Wireshark, something (firewall?) is still prevent the application listening to the required port on that PC to receive the package?

Example. Wireshark trace shows a recieved RTP(h264) packet, but there is no video on the softphone because firewall is blocking the port.

5

Yes. Wireshark operates "before" firewall and sees all the packets that the network card receives. Then the packets get filtered by the firewall running on the PC.

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