Intercom call is failing occasionally though it connects sometimes between two different call managers on SIP trunk. Checked EventViewer-Applicationlog and here is the below output. Feb 04 2025 07:00:00.067 UTC : %UC_CERT-3-CertExpired: %[Message=Cer...

I'm in the process of adding a New CUCM subscriber in a cluster wherein around 3000 IP phones would be getting registered in the same. There are already 2 dedicated TFTP subscriber nodes installed in the cluster catering more than 10000 IP Phones and...

Is it Mandatory to have Expressway E server certificate signed by Public CA for B2B calling. If yes, Can anyone share the Cisco documentation for the same.

Cisco Deskpro is currently registered in CUCM version 14 but it is showing Calling disabled on screen and not able to receive or make any extension calls in CUCM. Not sure, what's the issue here.