300-085 Question #7: Real Exam Question with Answer & Explanation

The correct answer is B: presence user agent. On Cisco VCS, the Presence User Agent publishes presence on behalf of endpoints, and the Presence Server aggregates and distributes that presence state to subscribers.

Cisco Unified IM and Presence

Question

Which two options in VCS-C and VCS-E handle presence status for registered endpoints? (Choose two.)

Options

Aback to back user agent
Bpresence user agent
Cdomain name system
Dpresence server
Epresence proxy

Explanation

On Cisco VCS, the Presence User Agent publishes presence on behalf of endpoints, and the Presence Server aggregates and distributes that presence state to subscribers.

Common mistakes.

A. The Back to Back User Agent (B2BUA) is responsible for SIP call signaling relay and media control, not for managing or distributing presence information.
C. DNS is a network infrastructure service used for name resolution and plays no role in processing or distributing SIP presence status for endpoints.
E. Presence proxy is not a named or documented functional component within the Cisco VCS/Expressway presence architecture.

Concept tested. VCS presence user agent and presence server roles

Reference. https://www.cisco.com/c/en/us/td/docs/telepresence/infrastructure/vcs/config_guide/X8-11/Cisco-VCS-Administrator-Guide-X8-11.html

Topics

#VCS presence#presence user agent#presence server#SIP presence

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