Hello,

If the destination is TCP, then you can detect the failure to relay in your OpenSIPS script. See the flags that t_relay() takes at www.opensips.org/html/docs/modules/1.11.x/tm#id294528

if (!t_relay("0x02")) {
    # failure to relay , treat error here
}

Make sure to also set low tcp_send_timeout and tcp_connect_timeout values , in order to detect the failures faster ( http://www.opensips.org/Documentation/Script-CoreParameters-1-11#toc92 )

Best Regards,

Vlad Paiu
OpenSIPS Developer
http://www.opensips-solutions.com

On 14.04.2015 15:02, chow wrote:
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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