Worst case is that B detects missing media and hangs up,
thus clearing state at B/Proxy. The general problem is solved
by session timers (draft-ietf-sip-session-timer-09.txt).
----- Original Message -----
From: feng zhang
Sent: Monday, August 19, 2002 11:24 PM
Subject: [Sip-implementors] About BYE

Hi All,

   look at the scenario below:

   User A and User B has setup a dialog through Proxy
      Proxy Record-Routes.
     
      User A               Proxy              User B
        |                    |                  |
        |      BYE           |                  |
        |--------> X line is down               |
        |                    |                  |

   
    User A wants to terminate the dialog, but the BYE can not be sent to the Proxy & User B
    (line between User A and Proxy is down).
    so, I want to ask:
       User A's Transaction enters "Terminated" state When Timer F fires.
       But User B's dialog state is still hanged up , he/she still thinks the dialog is not ended.
       The Proxy still remains the states about the dialog
    What should do in this scenario ?

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