Frequently Asked Question

Crestron panels communicate via UDP transport by refreshing data between sockets. The proper format string in the panel should be something like this:
sip:103@192.168.1.88:5060;transport=UDP : 100/In Progress (expires=0)

If you SSH into the suspect panel and see something like this:
sip:103@192.168.1.88:5060;transport=UDP : 100/In Progress (expires=-447865)

This is due to a recent bug in Crestron Panel firmware. Update the panel to Firmware after June 2022 and this should be resolved. Rebooting the panel will temporarily resolve the issue.