Add Cisco

[vanbroup]

https://www.cisco.com/security/pki/ (see Trusted Root Stores at the bottom)

Webex looks to rely on the Cisco root store, not sure though:
https://help.webex.com/en-us/WBX9000008850/What-Root-Certificate-Authorities-are-Supported-for-Calls-to-Cisco-Webex-Audio-and-Video-Platforms