[rohc] ROHC-v2 packet formats

["Mallikarjuna.H.B" <mallikarjuna.boralingegowda at lntinfotech.com>]

Hi,

1)

 For the ROHC RTP profile packet formats CO_common and CO_repair almost
same.(all the flags in CO_common are same as CO_repair, but in the draft it
is written like this:

co_repair: This format is very similar to the co_common format described
above. The difference is that this packet is intended to be used when
context damage has been assumed, and therefore
changing fields are transmit uncompressed when present in this format. This
format also contains some options to transmit semistatic fields from
extension headers which cannot be transmit with
the co_common format. This packet format should be considered a replacement
for the IR-DYN packet format which is not defined for the profiles defined
in this document.

other than the SN every thing is same. In Co_repair SN shall be sent
completely. 
Repair flag also there in CO_common . can we send the outer ip and ip_ext
header information using CO_common packet as in CO_repair packet?


2)

if ipv4_ipv4 packets to be compressed , the ip_id, TOS, TTL of the outer
header has to sent to the decompressor. if the inner ip_id is random then
even that also need to sent to the decompressor but i found no flag bits
indicating that the inner ip_id is present or not how the decompressor could
decompress the packet.

3)

if ipv6_extension headers are supported then even if there is a change in
one extension header, i might have to send all the extension header
information in the order following the actual packet or is there any other
way to convey this?

plz plz reply anybody knew this.

Regards,
Mallikarjuna

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