Is there documentation as to capacities such as the number of speed dials I can have personally vs. system speed dials on the Unified platforms and version levels for instance. There is a pdf that states the features available but not the capacities in a numeric value that I can find.
There are no system speed dials, that's a CME concept that does not apply to CUCM.
In CUCM such thing would be creating a custom directory and typing in all the contacts and numbers.
if this helps, please rate