> UPDATE can be used to modify m= i.e codec and a= . 
> Not c= 

I do not think that statement is true.  UPDATE can basically be used to
"update" everything a re-INVITE can "update".  This includes SDP changes
which comply with RFC3264.

If you think otherwise, please direct me towards statements within RFC3264,
other rfc, or Bugzilla number indicating that the c= line cannot be
"updated".


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