300-085 · Question #7
Which two options in VCS-C and VCS-E handle presence status for registered endpoints? (Choose two.)
The correct answer is B. presence user agent D. presence server. 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.
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
How the community answered
(26 responses)- A4% (1)
- B77% (20)
- C15% (4)
- E4% (1)
Why each option
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.
The Back to Back User Agent (B2BUA) is responsible for SIP call signaling relay and media control, not for managing or distributing presence information.
The Presence User Agent (PUA) on VCS generates SIP PUBLISH requests to represent the presence state of registered endpoints that do not natively support the SIP PUBLISH method, acting as a presence publisher on their behalf.
DNS is a network infrastructure service used for name resolution and plays no role in processing or distributing SIP presence status for endpoints.
The Presence Server on VCS receives and stores presence state via SIP PUBLISH, then notifies watchers via SIP NOTIFY in response to their SIP SUBSCRIBE requests, acting as the central presence distribution point for registered endpoints.
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
Source: https://www.cisco.com/c/en/us/td/docs/telepresence/infrastructure/vcs/config_guide/X8-11/Cisco-VCS-Administrator-Guide-X8-11.html
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