We have a fleet of Yealink T20P phones that will intermittently dial 0 a couple times and then dial *30. The pattern is usually a 0 followed by another 0 and then *30. I believe this behavior is transparent to the phones user. It will do this behind the scenes, so to speak. Lately we have seen this happening at regular intervals. 8:01 PM is the usual starting time The phones doing this are seemingly random. Some phones will do it every night while others will be a bit more sporadic. I'm doing some troubleshooting. I have increased the lease time for DHCP to see if this may be the issue. I'm also looking into any issues with the feature key synchronization settings on the phones. Everything else in the 3cx software has been working great. EDIT: Just checked the lease expiration dates and they are not even close to 8:00 PM. EDIT 2: Checking the log files on the Yealink phones. Nothing conclusive as of yet. One error has come up consistently: SUA <3+error >  [Server0:] try reg again after (30) s. This is a bit confusing because all phones stay registered.