It is absolutly NOT necessary.
You can upgrade the DEFINITY software towards R10, and leave the CC software at R6.
(The current software for CC is R9)
New features would be:
R7
ASAI Agents Work Modes
Announcement History Log
Expanded wait step capability (sec,min,hour)
R8
UUI byte limit increase
Dual link to CMS
Callmaster V native support
R9
ASAI/CTI enhancements
BSR Available Agent Adjustment (Most Idle Agent & Least Occupied Agent)
Duplicate Agent Administration
Holiday Vectoring
Remote Logout of Agent
VDN Service Observing Enhancements
note that if you would like to add agents (go from 500 to 550) you need to upgrade the CC software before Avaya can add agents. (it is their policy)
If you upgrade to R9 think twice before going from 500 to 100 agents. The more agents the lower the seat price.
A license upgrade for 100 agents is for instance $185,00 per seat, while with 500 agents you would pay $50,00 per seat.
If later on you would want to add agents a new agent from 100-200 would be $ 55,00 while you had those to begin with.
Hope this was usefull
Please let me know if the information that was provided is helpfull.
Edwin Plat
A.K.A. Europe