Hi everyone, I’m working with a customer who is planning to upgrade their Active Directory environment to Windows Server 2025. Their current collaboration environment is running Cisco Unified Communications Manager (CUCM) version 15. I’ve reviewed Ci...

Hi everyone, I’m looking for some advice regarding a persistent connectivity issue we're facing with our CUCM 15 deployment. We have a cluster spread across two physical sites with a Cisco Firepower firewall at each site. Every 60 minutes exactly, we...

  Hello, We’re using Webex Calling. After an employee left, their user account was deleted from Azure. Now, when I try to reassign the device Cisco  8851 to another user, I get an error saying the MAC address is already defined — but there’s no such ...

Hello , We are experiencing an issue with our Cisco IP Phone 7811 devices, where the phones are randomly initiating a line  without any user interaction. The events occur while no one is near the device, and the handset remains on the cradle. my CUCM...

Hello, I am experiencing an issue with a third-party device (Yealink W70B) registered to our CUCM (version 14.0.1). The device intermittently loses its registration with the CUCM . The temporary solution we have found is to either switch the device t...