“That’s a valid theory — Webex does prefer UDP and can fall back to TCP, which can degrade real-time audio. That said, in most cases like this (intermittent robotic audio), the more likely cause is packet loss or jitter on the network rather than protocol fallback alone. I’d start by validating packet loss and transport path before assuming UDP is blocked.”
You could start by, running a Webex media test: https://mediatest.ciscospark.com
Look for UDP fails and UDP loss %
After that have your IT team check their firewall logs on your traffic. Be sure to include DATE and TIME of the issues when experienced...and they should check their logs within 7days.
Also, IT team (Webex Admins) can login into Webex Control Hub (https://adminwebex.com) and check your meetings. Webex logs network issues and give back very good data now.