On Aug 19, 2009, at 13:07, Klaus Warnke wrote:
This is true. This wastes on octet. But if you are not wasting this octet, your RoHC will not able to talk "RTP" with other RoHC stacks.
IIRC, this little byte was the first big stumbling stone on the first day of the first ROHC interop -- half of the implementations had it and the other half didn't. The decision to always include this byte was made on the afternoon of that day, carried forward in all ROHC implementations since, and finally recorded in RFC 4815.
Gruesse, Carsten