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The server that cannot be configured during the installation phase when installing Cisco Unified Contact Center Express (UCCX) on Cisco Unified Computing System (UCS) servers is the SMTP server. The SMTP server is a server that enables the email functionality of UCCX, such as sending email notifications, alerts, and reports. The SMTP server cannot be configured during the installation phase, but it can be configured after the installation by using the Cisco Unified CCX Administration web interface12

The other options can be configured during the installation phase when installing UCCX on UCS servers:

Cisco Unified Communications Manager (CUCM) server: The CUCM server is a server that provides call control and device management for UCCX. The CUCM server can be configured during the installation phase by specifying the IP address or hostname, the username, and the password of the CUCM server. The CUCM server must be configured before the UCCX installation can proceed12

DNS server: The DNS server is a server that resolves hostnames to IP addresses and vice versa. The DNS server can be configured during the installation phase by specifying the IP address or hostname of the primary and secondary DNS servers. The DNS server is optional, but it is recommended to use it for easier management and troubleshooting12

NTP server: The NTP server is a server that synchronizes the time and date of UCCX with a reliable source. The NTP server can be configured during the installation phase by specifying the IP address or hostname of the primary and secondary NTP servers. The NTP server is mandatory, and the installation will fail if the UCCX server cannot reach the NTP server12

References: 1: Cisco Unified Contact Center Express Install and Upgrade Guide, Release 10.0(1) - Unified CCX Installation [Cisco Unified Contact Center Express] - Cisco 1 2: Cisco Unified Contact Center Express Install and Upgrade Guide, Release 10.0(1) - Unified CCX Configuration [Cisco Unified Contact Center Express] - Cisco 2

This statement is false because a subflow cannot access all variables in the calling script, unless they are passed as input parameters or global variables. A subflow has its own local variables that are not visible to the calling script. A subflow can only access the variables that are mapped to its input parameters or declared as global variables1.

The other statements are true because:

B. When the Call Subflow step executes, you can transfer values of variables from the calling flow to the subflow. This statement is true because you can use the Input Mappingstab of the Call Subflow step to map the variables from the calling flow to the input parameters of the subflow. This allows you to pass data to the subflow and initialize its variables2.

C. After the Call Subflow step executes, you can transfer values of variables from the subflow to the calling flow. This statement is true because you can use the Output Mappings tab of the Call Subflow step to map the variables from the subflow to the variables of the calling flow. This allows you to return data from the subflow and update the variables of the calling flow3.

D. The same subflow can be invoked from different scripts. This statement is true because a subflow is an independent script that can be reused in other scripts. You can call the same subflow from different scripts using the Call Subflow step and specify the subflow name and location4.

References: 1: Troubleshoot the Subflow - CRS Script - Cisco 2: Cisco Unified Contact Center Express Editor Step Reference Guide, Release 12.5(1) - Chapter 1: General Steps [Cisco Unified Contact Center Express] - Cisco 3: Cisco Unified Contact Center Express Editor Step Reference Guide, Release 12.5(1) - Chapter 1: General Steps [Cisco Unified Contact Center Express] - Cisco 4: Cisco Unified Contact Center Express Editor Step Reference Guide, Release 12.5(1) - Chapter 1: General Steps [Cisco Unified Contact Center Express] - Cisco

 The option that can be configured while installing Cisco Unified CCX on Cisco UCS servers is the NTP server. The NTP server is used to synchronize the time between the Unified CCX nodes and other components such as CUCM, LDAP, and SMTP servers. The NTP server must be configured on the first node before installing the second node, otherwise the installation will fail. The NTP server can be configured in the basic configuration information that is required during installation. The DNS server, the SMTP server, and the CUCM server are not configured during the installation, but they can be configured later in the Unified CCX Administration web interface. References := Deploying Cisco Unified Contact Center Express (UCCXD) v6.0 > Module 2: Implementing Cisco Unified Contact Center Express > Lesson 2: Installing Cisco Unified Contact Center Express > Topic 2.2: Installing Unified CCX1

 According to the Cisco Unified Contact Center Express Design Guide, Release 8.0(1), the two resource selection criteria that are available for a chat Contact Service Queue are longest available and most skilled. These are the criteria that determine how the chat contacts are routed to the available agents in the chat Contact Service Queue. The longest available criterion selects the agent who has been in the ready state for the longest time, regardless of the skill level. The most skilled criterion selects the agent who has the highest skill competency level for the chat Contact Service Queue, regardless of the ready time. These criteria can help to balance the workload and performance of the chat agents, and to match the chat contacts with the most appropriate agents. The other options are not valid resource selection criteria for a chat Contact Service Queue. Least skilled, most handled contacts, and random are not supported for chat routing, as they are not relevant or optimal for chat interactions. References: Cisco Unified Contact Center Express Design Guide, Release 8.0(1), Chapter 3: Unified CCX Architecture and Capacity Planning, Section 3.2.3: Agent Web Chat, Page 33

Historical reports can be generated using the Historical Reporting Client (HRC) and the Cisco Unified Intelligence Center (CUIC). The HRC is a standalone application that allows supervisors and administrators to view and print reports on historical data from the Unified CCX server. The CUIC is a web-based reporting application that provides real-time and historical reports for Unified CCX. Both tools allow users to create, schedule, and export reports on various aspects of the Unified CCX system, such as agent performance, call statistics, and system health. References:

Cisco Unified Contact Center Express Reporting Guide, Release 11.6(2), Chapter: Historical Reports

[Deploying Cisco Unified Contact Center Express (UCCXD) v6.0]2, Module 3: Cisco Unified CCX Reporting, Lesson 1: Cisco Unified CCX Reporting Overview

According to the Cisco Unified Contact Center Express Design Guide, Release 8.0(1), the maximum number of agent web chat sessions that is supported on the highest class server is 50. This means that a single agent can handle up to 50 concurrent web chat sessions on a server that meets the highest hardware specifications for Cisco Unified CCX 8.0. The highest class server for Cisco Unified CCX 8.0 is the MCS 7845, which has the following hardware configuration:

Processor: Two quad-core Intel Xeon E5440 2.83-GHz processors

Memory: 12 GB RAM

Hard disk: Four 146-GB SAS hard disks

The maximum number of agent web chat sessions depends on the hardware configuration, the deployment model, and the features enabled. For example, if Cisco Unified CCX is deployed in a high availability mode, the maximum number of agent web chat sessions is reduced to 25. If Cisco Unified CCX is deployed with Cisco Unified Presence, the maximum number of agent web chat sessions is reduced to 20. If Cisco Unified CCX is deployed with Cisco Unified Intelligence Center, the maximum number of agent web chat sessions is reduced to 10. The maximum number of agent web chat sessions also varies for different versions of Cisco Unified CCX. For example, Cisco Unified CCX 7.0 can support a maximum of 25 agent web chat sessions, while Cisco Unified CCX 9.0 can support a maximum of 60 agent web chat sessions. References: Cisco Unified Contact Center Express Design Guide, Release 8.0(1), Chapter 3: Unified CCX Architecture and Capacity Planning, Section 3.2.3: Agent Web Chat, Page 331 Cisco Unified Contact Center Express Design Guide, Release 8.0(1), Chapter 3: Unified CCX Architecture and Capacity Planning, Section 3.3: Unified CCX Hardware Configuration, Page 372