[OpenSIPS-Users] how do I check destination user is offline

[chow]

Hi ALL:
       User A  sent register to opensips. then User A client core-dump,  so
User A will  never sent unregister message to opensips.
       in this case , how do I  Immediately know User A unreachable .
registered function can not know this,
by the way,  transport protocol is TCP.
        thanks a lot.



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