[SIPForum-discussion] Need help about RFC 3262

[古明路]

Hi,All
 
  At the end of '3 UAS Behavior' RFC 3262, 
 
   The UAS MAY send a final response to the initial request before   having received PRACKs for all unacknowledged reliable provisional   responses, unless the final response is 2xx and any of the   unacknowledged reliable provisional responses contained a session   description.  In that case, it MUST NOT send a final response until   those provisional responses are acknowledged.  If the UAS does send a   final response when reliable responses are still unacknowledged, it   SHOULD NOT continue to retransmit the unacknowledged reliable   provisional responses, but it MUST be prepared to process PRACK   requests for those outstanding responses.
 
Can some one tell me, the red words 'reliable responses ' mean 'provisional responses contained a session description' or 'provisional responses without a session description'.
 
thanks & regards,
Minglu
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