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[Didier Barvaux <question265502@xxxxxxxxxxxxxxxxxxxxx>]

Question #265502 on rohc changed:
https://answers.launchpad.net/rohc/+question/265502

    Status: Open => Answered

Didier Barvaux proposed the following answer:
Hello,

The UDP port that you specify for the rohctunnel tool is used to
transmit the compressed ROHC packets over a network towards the endpoint
of the tunnel. That port is not related to the UDP port used by the RTP
stream that you generate with VLC. Note that they could use the same
port number, but there is requirement to do so.

The rohctunnel application is a test tool, therefore it is limited. It
doesn't allow the users to perform a custom detection of RTP streams.
Its internal algorithm to detect RTP streams uses a static list of UDP
destination ports: 1234, 36780, 33238, 5020 or 5002. Any UDP stream that
uses one of those ports will be compressed with the IP/UDP/RTP profile
(0x0001). For testing purposes, you may either use one of those ports
for VLC or patch the code of the rohctunnel app to add port 5000 to the
list.

Please note that the rohctunnel is deprecated. It will be removed with
the next major release. For testing purposes, give a try to the sniffer
or fuzzer tools. For a production-grade tunnelling solution, check the
IP/ROHC application.

Regards,
Didier

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