[Sip] Doubt in Sec-8.2 ,rfc-3261(SIP)

["Sumit Arora , Noida" <sumit@acmet.com>]

    Dear sir,
 
     I am having doubt on these lines from rfc-3261 ,
     Sec-8.2, UAS behavior
 
   
  " Note that request processing is atomic.  If a request is accepted,
    all state changes associated with it MUST be performed.  If it is
    rejected, all state changes MUST NOT be performed."
 
   Is this above MUST and MUST not requirement , Talking 
   about  the state machine in Section - 17.2 Server Transaction.
 
   Kindly reply.
 
  Thanx
  -Sumit Arora -

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