1. what are the versions of CUCM you worked ? 2. How does Unity voicemail integrates with CUCM? 3. What are steps to integrate IM & Presence with CUCM? 4. what is VCS solution ? 5. How does VCS is helpful in CUCM system and why is required ? 6. What are the steps in integrating UCCX with CUCM ? 7. Give examples of compatible versions of CUCM, Unity, IM & Presence and UCCX ? 8. Did you worked on Jabber ? 9. How do does it works ? How do you enable Jabber in CUCM system ? 10. steps to enable certain features in UCCX ? 11. Explain UCCX call flow & routing ?