From: Zarko Coklin <[EMAIL PROTECTED]>

   I have a practical question. SIP device subscribes to
   a SIP server, notifications are sent for some time and
   then server reboots. When this happens CSeq on server
   side is reset to 1.

   Next time SIP phone subscribes, server accepts a
   request but NOTIFY to the phone has CSeq = 1. This
   confuses the phone since CSeq is lower than the one
   received in a last NOTIFY before reboot.

The next time the SIP phone attempts to refresh its subscription, the
server notices that it is a re-SUBSCRIBE (because the request has a
to-tag), but the server has no knowledge of the subscription.  So the
server responds 481.

Dale
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