Subject: RE: [rohc] about CSRC List with CC=0

From: "Lars-Erik Jonsson (LU/EAB)" <[email-masked]>
Date: Tue, 23 Mar 2004 13:53:06 +0100

Please see the ROHC implementers guide:
http://www.ietf.org/internet-drafts/draft-ietf-rohc-rtp-impl-guide-04.txt <http://www.ietf.org/internet-drafts/draft-ietf-rohc-rtp-impl-guide-04.txt> 
 
Section 5 discusses list compression issues.
 
/L-E

-----Original Message-----
From: [email-masked] [mailto:[email-masked]]On Behalf Of [email-masked]
Sent: den 23 mars 2004 03:52
To: [email-masked]
Subject: [rohc] about CSRC List with CC=0

If CC=0, the length of CSRC Generic CSRC list? One Octet? two Octet or None at all? 
One octet 
     0   1   2   3   4   5   6   7
  +---+---+----+---+---+---+---+---+
  | ET=0  |GP=0|PS |    CC = 0     |
  +---+---+----+---+---+---+---+---+

two octet 
     0   1   2   3   4   5   6   7
  +---+---+----+---+---+---+---+---+
  | ET=0  |GP=1|PS |    CC = 0     |
  +---+---+----+---+---+---+---+---+
  :            gen_id             :  1 octet, if GP = 1
  +---+---+---=+---+---+---+---+---+

or None at all (because in RTP dynmaic part CC=0 indicates that no CSRC list) 

Best Regards

Zhou Zongming 周宗明
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