Sounds like you're working on a sales preso, have you contacted the Cisco sales team, I'm sure they have bundles of information which you could use. Additionally, look at the product sheets for each release and it should have some high level talking points (max calls, OS, hardware, etc.)
The most sensible answer is to be on the latest for the simple reason is that's where Cisco have their focus. You want to be on the right train. It's hard to support many different versions, and with the upcoming release of 8.0, you would not want to be on two releases back.
Consider UCCE 7.2. The last SR was SR7 - it came out in November of 2008. There has not been one since, and there never will be one (most likely). There are over 100 Engineering Specials on this code base.
Contrast with UCCE 7.5. The last SR was SR7 on Dec 2009.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...