[CCXML] Query regarding <dialogstart> command

Hi, 

  In section 7.2.2.1 of W3C working draft for Voice browser call control - CCXML,  It says that

"If the prepareddialogid attribute is specified and any attribute values  conflict with the values specified in the 
<dialogprepare> element this  MUST result in the throwing of an error.dialog.notstarted event"

In this case, should we check all attributes of <dialogstart> like connectionid/conferenceid, maxage, 
maxstale, enctype, method and hints against the corresponding <dialogprepare> command? 

Or only the checking of mediadiection (which is explicitly specified in CCXML draft) is enough?

Regards,
Sajeesh

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