2020年5月5日 · Hello, I have a UCM6204 running firmware version 1.0.20.23 and using FlowRoute as a provider. I’m having an issue with outbound calls failing after exactly 30 minutes. I’ve replicated the issue on a zero config deployed GXP2170, a Yealink phone, and a softphone. Here are some of the things I have tried and have setup so far: My firewall has 5060 TCP/UDP and 10000-20000 UDP open to the UCM ...