[cisco-voip] CUCM top of mind issues

[Wes Sisk]

I've had the good fortune to work with a good Cisco team and several great customers recently including some of you from this list.  Out of that work There are some top of mind items that folks may benefit from by knowing rather than going through the learning process.

Many of the hot issues are covered in the Hot Issues RSS Feeds:
https://supportforums.cisco.com/docs/DOC-5727
http://www.cisco.com/warp/public/146/news_cisco/data/syndication/ext/tachi/ExternalCUCM.xml


Here is a bit of extra insight for Friday:

MCS deployments:
* Readonly filesystems are caused by a combination of  hardware, firmware, and drivers in the linux kernel. Hardware replacement is straight forward. Always re-update firmware after hardware replacement. Firmware is updated with the FWUCD. Drivers in the linux kernel are updated with CUCM software upgrades. Customer provide HP servers and HP based MCS servers must be updated with firmware directly from the HP website.
Latest FWUCD on Cisco.com: Downloads Home
Products
Voice and Unified Communications
Communications Infrastructure
Voice Servers
Cisco 7800 Series Media Convergence Servers
Cisco MCS 7835-I3
Voice Applications OS Firmware For IBM-3.6(6)
http://www.cisco.com/cisco/software/release.html?mdfid=282821930&flowid=6694&softwareid=283046743&release=3.6%286%29&relind=AVAILABLE&rellifecycle=&reltype=latest


UCS deployments:
* UCS installs may encounter readonly filesystem or intermittent network connectivity due to a known issue:
https://supportforums.cisco.com/docs/DOC-23667
CSCth36989    [CUPT80] PSOD on vmotion of two vm's in a loop with netperf UDP traffic
CSCtw68712    UCS C-series bios fix for VMware esx intel interrupt remapping issue

* Be aware of jitter in media resources hosted on the server:
CSCtz29142    UCS CUCM Media resources introduces jitter causing bad voice quality


CTI Deployments including Contact Centers:
* CUCM 8.6.2 base has proven very problematic for CTI integrations including Contact Center. Strongly consider starting at 8.6(2a)su1 for any deployment leveraging CTI.
CSCtx57751    CTIManager Core on DeviceEventRouter
CSCtx06424    Get TermRegistrationFailedEv when dynamic register CTI port at 2nd time
CSCts56726    CiscoProvTerminalUnRegisteredEv CiscoAddrRemovedEv failed after EM Login
CSCty22899    Devices do not go in service after EM logout and CCM restart
CSCtt41083    Invalid station PID between CTI and CCM Services
CSCts97096    CTI info not updated, if EM phone is unplugged without proper logout