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.
 
How can I avoid this problem? I am looking for a way
to let phone know it is time for a new dialog and it
should accept NOTIFYs with CSeq = 1. Can anybody
suggest a best practice to overcome such problem?
 
I was thinking of changing To tag in 200 OK response
to a SUBSCRIBE request. Ideally, that should let SIP
device know a new dialog is established. Not sure if
this is a right logic though.
 
Regards,
Zarko Coklin


 
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