I have a system with lots of Polycom SoundPoint phones running for many years without any issues.
After upgrading from 18.04 with Centos 6 to 19.04 with Centos 7 we started experiencing registrations expiring at an alarming rate, all else looks good and healthy and the system may go as much as 24 hours without a single phone expiring but then all of the sudden the count goes down one by one up to 40 phones expiring and all the services are running fine and a restart of the sipxecsservices or the entire server does nothing, then on its own starts working fine again, but by then, up to 8 hours later and lots of users complains.
I even set the SipxRegistrar setting for max and min expire time to 3600 and 60 and it made no difference.
The system has 3 servers with HA configure as it's been for the past 7 years. and the load balancing goes to 3.0 when it looks fine and then it drops to 2.6 or so when it's not but again, each server looks good.
Any ideas would be greatly appreciated.