Explanation: Courtesy Callback is an advanced UCCE feature that allows customers to request a callback when an agent is available, reducing wait times and improving the customer experience.

A CUCM Admin access is needed to manage agent phones for UCCE/PCCE, as it allows the administrator to configure device pools, partitions, calling search spaces, and other settings for the agent phones. References
= Administering Advanced Cisco Contact Center Enterprise (CCEAA), page 4

B CVP and Finesse exchange data between Expanded Call Context Variables, as CVP can pass ECC variables to Finesse through the User to User Information (UUI) field in the SIP header. E CCE and CVP exchange data between Expanded Call Context Variables, as CCE can pass ECC variables to CVP through the Peripheral Interface Manager (PIM) or the VRU Peripheral Gateway (VPG) depending on the deployment model. Reference = Advanced Administration and Reporting of Contact Center Enterprise (CCEAAR), page 6; [Cisco Unified Contact Center Enterprise Features Guide, Release 12.5(1)], page 23

A CUCM Admin access is needed to manage agent phones for UCCE/PCCE, as it allows the administrator to configure device pools, partitions, calling search spaces, and other settings for the agent phones. Reference = Administering Advanced Cisco Contact Center Enterprise (CCEAA), page 4