> Perhaps there is something I am missing but tunnel mode does not
> solve the problem. Even if I can then compress the IP header, I have
> to put another one back on in order to make the tunnel function, and
> this thus eliminates the benefit.
The benefit is not fully eliminated. Compression efficiency is indeed
decreased, but may still be interesting :
IPv4/UDP/RTP/data
-> ROHC/data
-> IPv4/ESP/encrypted(ROHC/data)
is better than :
IPv4/UDP/RTP/data
-> IPv4/ESP/encrypted(IPv4/UDP/RTP/data)
If you care about security of RTP streams, you might want to have a
look at SRTP [1]. It ensures security at the application level, it is
fully compatible with ROHC without efficiency loss.
Regards,
Didier
[1] https://en.wikipedia.org/wiki/Secure_Real-time_Transport_Protocol
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