Yes some more info would be handy, like software versions used, which kind and type (sip/h323) fails,
a screenshot or copy/paste of the error message, ...
It might be the sip registration timer
Applies to Cisco TelePresence Content Server versions earlier than S5.2.
The SIP Standard registration refresh minimum setting introduced in VCS X7.0 has a default value of 45 seconds. Devices that request a value lower than the Standard registration refresh minimum setting will result in the registration being rejected with a 423 Interval Too Brief response. Any SIP devices, such as the Cisco TelePresence Content Server, that do not retry their registration request after receiving a 423 response will fail to register. The workaround is to set the Standard registration refresh minimum setting on the Cisco VCS to 30 seconds.
Besides that, if there is a firewall in between, especially business grade ones with defaut h323/sip handing
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
This document describe how DST changes and how time changes are
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...