I have a customer with C40 (TC6.2.1) registering with our VCS (X7.1). Once in a while, for some reason, the registration times out and is not refreshed and the only way to get it back on-line is to reboot the system. While unregistered, the C40 is perfectly accessible through the WEB etc. The following message appears in the VCS logs:
Oct 22 13:48:31 tvcs: Event="Registration Removed" Reason="Endpoint unresponsive" Service="H323" Dst-ip="10.226.130.19" Dst-port="1719" Dst-alias-type="H323" Dst-alias="MID_CLH_0514_CTN_02" Dst-alias-type="E164" Dst-alias="705526051402" Detail="Registration was not refreshed in time and endpoint failed to respond to IRQ" Protocol="UDP" Level="1" UTCTime="2013-10-22 17:48:31,637"
This is not the only case, we have some other endpoints behaving the same way and the only common denominator is being C40.
I forgot to mention though that it always happens when the system is in a "sleeping beauty" mode. Once you wake it up through the WEB (Call Control screen), it comes alive. The unresponsiveness can happen anytime. Last one happened after 4 days of proper work...
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