Which of the following are considered to be presence entities by the Presence feature of UCM? (Select 2
choices.)
A.
a dn
B.
an application user
C.
an end user
D.
an IP phone
E.
a SIP trunk
Explanation:
A directory number (dn) and a Session Initiation Protocol (SIP) trunk are considered to be presence entities, or
presentities, in the Presence feature of Cisco Unified Communications Manager (UCM). Presence entities can
be monitored in real time by the UCM Presence feature, which enables a user or a device known as a watcher
to monitor the registration status of a dn or a SIP trunk. In addition, Presence enables watchers to view whether
an IP phone that is associated with a specific dn is onhook or offhook. A SIP trunk can be both a presence
entity and a watcher.
Presence enables a watcher to monitor dns in real time by displaying a status icon beside dns that appear in
speeddial lists or directory lists, such as the Missed Calls list, on an IP phone. The icon can represent one of
the following three states:
Unknown – The registration status of the device that is associated with the dn cannot be determined.
Onhook – The device that is associated with the dn is registered and currently in the onhook state.
Offhook – The device that is associated with the dn is registered and currently in the offhook state.
Presence can send and receive presence requests and responses only on Skinny Client Control Protocol
(SCCP) lines, SIP lines, and SIP trunks. If Presence requests or responses are sent to a Media Gateway
Control Protocol (MGCP) trunk or to an H.323 trunk, those requests are rejected by UCM.
Application users, end users, and IP phones are considered to be watchers, not presence entities, in the
Presence feature of UCM. Because a dn or line that is associated with an IP phone can be monitored by the
Presence feature, only the IP phone itself is considered to be a watcher. The dn or line that is associated with
an IP phone is a presence entity.https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/8_0_2/ccmfeat/fsgd-802-cm/fsprsnc.html#wp1153398