Implementing Cisco Collaboration Devices (CICD) Free Sample Questions

The Cisco Trivial File Transfer Protocol (TFTP) service is responsible for providing configuration files, firmware, and other essential files to Cisco IP phones during the boot-up and registration process. Since the phone is sending a TFTP request but not receiving a response, despite network connectivity being confirmed, the most probable cause is that the TFTP service is not running on the CUCM servers defined in DHCP option 150.

The Circular algorithm distributes calls sequentially to the members of a line group, starting from the member that is next in line after the one that last handled a call. This ensures an even distribution of calls among all agents in the group, which matches the requirement.

Cisco recommends that jitter for VoIP traffic should be kept below 30ms. The reported average of 45ms and max of 80ms are well above this threshold. High jitter, which is the variation in packet arrival time, forces the endpoint's de-jitter buffer to work harder and can lead to discarded packets, resulting in choppy or distorted audio. The latency (<150ms) and packet loss (<1%) are within acceptable limits.

In Cisco Unity Connection, the Class of Service (CoS) defines a set of permissions and limits for a group of users. This includes features like maximum message length, access to system distribution lists, the ability to use the web inbox, and permissions to change TUI/GUI passwords. Assigning a user to a specific CoS is a fundamental step in controlling their voicemail capabilities.

The Remote Destination Profile is a virtual device profile that contains the configuration for the remote destinations, such as line settings, and is associated with the user's end user account.

A Remote Destination must be configured with the user's mobile phone number. This tells CUCM where to extend the call when SNR is active. The Remote Destination is then associated with the Remote Destination Profile.

Unlike CUCM which uses a dedicated database, Cisco UCM Express (CME) is a feature set within Cisco IOS. All configuration, including ephone-dns, ephones, voice register pools, and dial-peers, is part of the router's standard running-configuration. This is a key architectural difference between the two solutions.

This combination provides the necessary enterprise-grade features. CUCM is designed for large-scale, centralized call control with high availability. Cisco Unity Connection offers advanced voicemail features like speech recognition. The Cisco IM and Presence Server integrates with CUCM to provide the required instant messaging and presence capabilities for all users. CME and Unity Express are designed for smaller branch deployments and lack the scalability and centralized management required.

The 'Cisco CallManager' performance object in RTMT contains critical counters related to call processing. Specifically, counters like 'CallProcessingDelay' can provide insight into the latency introduced by CUCM during call setup. Other counters in this category, such as 'CallsAttempted' and 'CallsCompleted', help in understanding the overall call processing load.

The error 'Login is unavailable (201)' specifically indicates that the IP phone cannot access the URL for the Extension Mobility service. This is typically a network connectivity issue, a DNS resolution failure for the CUCM server name in the URL, or a misconfigured Service URL under Enterprise Parameters or the phone's device settings.

A SIP Trunk Security Profile defines security-related settings for a SIP trunk. When configured for 'Non Secure', it specifies that the communication will be unencrypted. It sets the device security mode, transport type (typically UDP or TCP), and the incoming/outgoing ports (defaulting to 5060 for SIP). This profile is mandatory for the SIP trunk configuration, even for unencrypted communication.