The UAC behavior for CANCEL is not discussed in RFC 3261.
 
When a UAC computes the request digest for CANCEL, should it use the nc-value unchanged from the INVITE or should it  increment the nc-value?
 
In general, every request should have a new nc-value (except ACK, of course), so I think this will apply to CANCEL. Is this correct?
 
 
Venkat
 
 

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