Which of the following enables a watcher to monitor the status of a registered dn in real time?
- Unity Connection
- Unity Express
- Unified Presence
The Cisco Unified Communications Manager (UCM) Presence feature enables a watcher to monitor the status of a registered directory number (dn) in real time. Devices that can send Presence requests for information about dns are called watchers. An IP phone is an example of a watcher. Presence enables an IP phone user to monitor dns in real time by displaying a status icon beside dns that appear in speed-dial 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.
-On-hook – The device that is associated with the dn is registered and currently in the on-hook state.
-Off-hook – The device that is associated with the dn is registered and currently in the off-hook state.
Session Initiation Protocol (SIP) Uniform Resource Identifiers (URIs) or dns that can be monitored by Presence are known as presence entities, or presentities. SIP trunks and dns can be presence entities. A SIP trunk can also be a watcher. 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.
Neither Cisco Unity Connection, Cisco Unity Express (CUE), nor Cisco Unity enables a watcher to monitor the status of a registered dn in real time. Unity Connection, CUE, and Unity are all voice messaging technologies.
Cisco Unified Presence (CUPS) does not enable a watcher to monitor the status of a registered dn in real time. CUPS is server software that centralizes network traffic from several different communications services so that it can all be transmitted over the same Cisco Voice over IP (VoIP) network. CUPS is not the same as the UCM Presence feature.