Cisco Unified Communications Manager (UCM) categorizes Cisco IP phones and Cisco TelePresence endpoints as conditionally trusted endpoints. Learn more about why these devices are considered conditionally trusted.
Table of Contents
Question
Which two types of devices are included in the conditionally trusted endpoints category of Cisco UCM? (Choose two.)
A. handheld mobile devices
B. unsecure PCs
C. analog gateways
D. Cisco IP phones
E. Cisco TelePresence endpoints
Answer
According to Cisco, the two types of devices that are included in the conditionally trusted endpoints category of Cisco Unified Communications Manager (UCM) are:
D. Cisco IP phones
E. Cisco TelePresence endpoints
Explanation
Cisco defines conditionally trusted endpoints as devices that are trusted only under specific conditions or for limited functions. Both Cisco IP phones and Cisco TelePresence endpoints fall into this category.
Cisco IP phones are considered conditionally trusted because they use a secure, encrypted connection to communicate with Cisco UCM. The IP phone establishes a TLS connection to download its configuration file and firmware loads from UCM. This ensures the integrity and authenticity of the files. However, the actual media streams (voice and video) sent to and from the IP phone are not encrypted by default. Therefore, Cisco IP phones are trusted for certain functions like configuration and firmware loads, but not fully trusted for all communications.
Similarly, Cisco TelePresence endpoints use secure protocols when communicating with UCM for signaling and configuration purposes. However, the actual audio and video media streams may not be encrypted, depending on how the TelePresence system is configured. So TelePresence endpoints are also conditionally trusted since they use secure connections for some functions but not necessarily for the media itself.
The other options listed – handheld mobile devices, unsecure PCs, and analog gateways – do not fit into the conditionally trusted category defined by Cisco. Mobile devices and unsecure PCs would generally be considered untrusted endpoints. Analog gateways convert between analog and IP networks, but are not endpoints that directly register to UCM like IP phones and TelePresence systems do.
In summary, Cisco UCM considers Cisco IP phones and TelePresence endpoints as conditionally trusted, since they use secure connections for certain trusted functions like configuration and signaling, but do not always encrypt the actual media streams. Understanding endpoint trust categories is important for designing and implementing secure Cisco Unified Communications solutions.
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