It's very likely that most if not all of your problems are QoS related. The simplest way to begin to fix these issues is with the "autoqos" command if supported by your devices. See the link below. The other links give good information regarding troubleshooting and fixing some of the specific issues you mentioned.
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...