Question #675471 on rohc changed:
https://answers.launchpad.net/rohc/+question/675471
Status: Open => Answered
Didier Barvaux proposed the following answer:
Hello,
Choosing the best ROHC packet to use is not fully specified in RFCs. Some
constraints and
guidelines are given, but choosing the best ROHC packet is left to the
implementations.
The RFC 3095 ยง5.2.7 (https://tools.ietf.org/html/rfc3095#section-5.2.7) gives
some insights,
especially for the UO-1-ID packet:
Packet type 1: R-1, R-1-ID, R-1-TS, UO-1, UO-1-ID, UO-1-TS.
U-mode and O-mode: Only the values of RTP SN, RTP TS and IP-ID can
be used as references for future compression. Nonupdating values
can be provided for other fields using an extension (UO-1-ID).
The UO-1-ID packet with X=1 may be used but not for updating the context with
the
new information transmitted in the extension. So, the IR or UOR-2 packets are
used
to update the context.
Regards,
Didier
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