Calling privileges on Cisco Unified Communications Manager Express are configured using Class of Restriction (COR) and corlist. COR allows administrators to control which types of calls certain users or devices can make. By defining COR lists (corlist), you can create different levels of calling privileges for users and devices, controlling access to specific routes or destinations.

To configure Cisco TelePresence Conductor for ad hoc and rendezvous conferences on Cisco Unified Communications Manager, you need to verify the location configuration to ensure proper routing and bandwidth management. Verifying the certificate trusts is crucial for secure communication between the devices. Additionally, configuring one SIP trunk to the TelePresence Conductor is necessary for the communication setup between Cisco Unified Communications Manager and the TelePresence Conductor.

The class of service (CoS) is used for traffic classification and marking at Layer 2. IP precedence and differentiated services code point (DSCP) are used for traffic classification and marking at Layer 3. CoS is associated with Layer 2 as it is used in Ethernet frames' 802.1Q/p tags. IP precedence and DSCP are fields in the IP header which belong to Layer 3, providing a way to specify and enforce QoS (Quality of Service) policies across IP networks.

The correct discard digits instruction that removes all digits prior to the North American Numbering Plan portion of the route pattern is 'PreDot.' This is because 'PreDot' instructs the system to remove the digits before the specified dot ('.') in the route pattern, which typically precedes the NANP portion of the dialed number.