If it's correct and it's only 4 minutes off, I've never heard of something like that. The time is sent to the phone in SCCP updates. For this to happen it would require for the phone to not be receiving just the time updates, which is odd. That, or you're running an old version of phone firmware and it's a bug.
I would upgrade the phone firmware and check your clock on the router.
(Just because it's configured for NTP doesn't mean it's working. 'show ntp association' may help.)
2. No. It is sent to the phones, but the phones don't have a reason to acknowledge it and send it back to CME. You may want to check the phone web page - it is listed there though.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...
If you have 2 ISR routers, one acting as Failover, do we need to have both the same number of SRST licenses on the 2 routers?
No. You will only need the SRST licenses on the primary router. Because this feature...