On Communication Manager version 6.x on - System-parameters features (Page 12), there is no option for CMS R18 when attempting to set CMS R18 as the CMS release connected to the CM 6.x
change system-parameters features Page 12 of 20
FEATURE-RELATED SYSTEM PARAMETERS
AGENT AND CALL SELECTION
MIA Across Splits or Skills? n
ACW Agents Considered Idle? n
Call Selection Measurement: current-wait-time
Service Level Supervisor Call Selection Override? n
Auto Reserve Agents: none
Block Hang-up by Logged-in Auto-Answer Agents? n
CALL MANAGEMENT SYSTEM
REPORTING ADJUNCT RELEASE (determines protocol used by appl link)
CMS (appl mis): R16.1/R16.x/R17.0
AAPC/IQ (appl ccr):
BCMS/VuStats LoginIDs? y
BCMS/VuStats Measurement Interval: hour
BCMS/VuStats Abandon Call Timer (seconds):
Validate BCMS/VuStats Login IDs? n
Clear VuStats Shift Data: on-login
Remove Inactive BCMS/VuStats Agents? n
R15/R16 R16.1/R16.x/R17.0