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300-085 · Question #32

In Cisco Unified Communications Manager presence with SIP, if the presence entity resides within the Cisco Unified Communications Manager cluster, how does Cisco Unified Communications Manager…

The correct answer is A. by sending a SIP NOTIFY message to the presence watcher to indicate the current status of the. When a SIP line-side presence request is received for an entity within the CUCM cluster, CUCM responds with a SIP NOTIFY message conveying the current presence status to the watcher.

Cisco Unified IM and Presence

Question

In Cisco Unified Communications Manager presence with SIP, if the presence entity resides within the Cisco Unified Communications Manager cluster, how does Cisco Unified Communications Manager respond to a SIP line-side presence request?

Options

  • Aby sending a SIP NOTIFY message to the presence watcher to indicate the current status of the
  • Bby sending a SIP SUBSCRIBE message to the presence watcher to request the presence status
  • Cby sending SCCP messages to the presence watcher to indicate the current status of the
  • Dby using the Cisco Unified Presence PUBLISH Trunk service parameter on Cisco Unified

How the community answered

(30 responses)
  • A
    73% (22)
  • B
    3% (1)
  • C
    10% (3)
  • D
    13% (4)

Why each option

When a SIP line-side presence request is received for an entity within the CUCM cluster, CUCM responds with a SIP NOTIFY message conveying the current presence status to the watcher.

Aby sending a SIP NOTIFY message to the presence watcher to indicate the current status of theCorrect

In SIP-based presence within Cisco Unified Communications Manager, when the presence entity (the watched user) resides in the same CUCM cluster, CUCM responds to a SUBSCRIBE request from a presence watcher by sending a SIP NOTIFY message that carries the current status of the entity, fulfilling the standard SIP event notification framework defined in RFC 3265.

Bby sending a SIP SUBSCRIBE message to the presence watcher to request the presence status

A SIP SUBSCRIBE message is sent by the watcher to request presence status, not by CUCM in response; CUCM sends NOTIFY, not SUBSCRIBE, when fulfilling a presence request.

Cby sending SCCP messages to the presence watcher to indicate the current status of the

SCCP is a Cisco proprietary signaling protocol used for phone registration and call control, not for delivering SIP-based presence status notifications to a presence watcher.

Dby using the Cisco Unified Presence PUBLISH Trunk service parameter on Cisco Unified

The Cisco Unified Presence PUBLISH Trunk service parameter is used for publishing presence data to the Presence Server, not for directly responding to SIP line-side presence subscription requests.

Concept tested: SIP NOTIFY response for intra-cluster CUCM presence requests

Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_0_1/ccmsys/accm-801-cm/a03pres.html

Topics

#SIP presence#NOTIFY message#line-side subscription#CUCM

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