The Admin Guide outlines the configuration needed on CUCM. Off the top of my head I believe you also have a SIP Profile with custom timers to create.
As far as the firewall goes: I hope you are referring to AnyConnect Mobile VPN Client for Android or the Secure Connect feature of Jabber. Opening the firewall to CUCM from the Internet without a VPN tunnel would be a massive security/DoS risk.
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...