RTP over UDP on mobile data

[Vladislav]

Hello everyone, I have a problem sending RTP traffic inside UDP protocol over a mobile network.

The problem does not occur if I use a WiFi network, or if I send RTP traffic inside TLS protocol on a mobile network.

I compared the logs of the coturn server in cases of establishing a connection on a WiFi and on a mobile network, there is no difference in the requests sent.

I also compared tcpdumps of outgoing traffic from a WiFi network and a mobile network. The server does not receive data from a client using a mobile network. But tcpdump on the client side indicates that the data is being sent.

I checked Telegram App traffic during an audio call using my mobile network. They send RTP traffic using UDP protocol. What could be their trick?