[SR-Users] Problem on dialog and reInvite

Hi I've a problem of this type: On the first INVITE is all ok, insert record route with cookie of the dialog: Record-Route: <sip:x.x.x.x;lr=on;ftag=as0f04b1b4;didsw=007.1661> The I recieive a 422 for the session timer too small . I resend the new invite with correct expire but with a new cookie dialog value Record-Route: <sip:x.x.x.x;lr=on;ftag=as0f04b1b4;didsw=007.2661> Then the call is connected (Record-Route: <sip:x.x.x.x;lr=on;ftag=as0f04b1b4;didsw=007.2661>). The there is a reInvite for the session timer , the script enter in the routine WITHINDLG . At this point the dialog seems to be lost. The accounting is made with dialog variable and in the 2 records INVITE and BYE , the fields corresponding to these values are missing. In all the other calls without the reInvite for session timers, the dialog is found and the variables are present. I don't understood what is problem ? Thanks for the help