Subject: [rohc] Doubt in Shared Compression(SIGCOMP)

From: "Gangadharan G - TLS,Chennai" <[email-masked]>
Date: Fri, 17 Nov 2006 12:02:27 +0530

Hi All,
 
RFC 3321 Section 5.2 [Page 10] specifies that
 
   (4): If endpoint 2 uses shared compression, it compares the state
        identifier values in the "returned SigComp parameters"
        information with the value it has calculated for the current
        decompressed message received from endpoint 1.  If there is a
        match then endpoint 2 uses the shared state together with the
        state it would normally use if shared compression is not
        supported to compress the next message.
 
My Question is:
* Which module has to calculate SHA-1 for the recently received message and 
   which one has to compare with the "returned SigComp parameters"?
 
If Decompressor Dispatcher Calculates and the Compressor compares the SHA-1
of the received Message,
* When and How the Decompressor Dispatcher has to pass the SHA-1 value to
the Compressor module?

Thanks,
Gangadharan.
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