> Did I just misread the RFC and the dialog can just be cleaned
> up locally or is the UAC nevertheless supposed to send a BYE, 
> cleaning up the dialog when the BYE transaction finally 
> terminates? 

The following is from RFC 3261 section 12.2.1.2:

"If the response for a request within a dialog is a 481
(Call/Transaction Does Not Exist) or a 408 (Request Timeout), the UAC
SHOULD terminate the dialog.  A UAC SHOULD also terminate a dialog if
no response at all is received for the request (the client
transaction would inform the TU about the timeout.)

   For INVITE initiated dialogs, terminating the dialog consists of
   sending a BYE."


For those interested, the 481 topic was discussed within IETF 49 SIP working 
group:
http://www.ietf.org/proceedings/49/ 



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