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Presence
Cisco Unified Communications includes multiple options to integrate basic Presence information.
The CUCM-included Presence information includes the following capabilities:
■ Presence-enabled speed dials: Speed dial buttons that indicate the status of the target
of the speed dial
■ Presence-enabled call and directory lists: Call lists and directory entries that indicate
the status of each list entry
■ Presence policy: Tools allowing access control to Presence information
When using the Cisco Unified Presence Server product, additional features are added to
those provided by the native CUCM Presence feature, including the following:
■ Standards-based Session Initiation Protocol (SIP) / SIP for Instant Messaging and
Presence Leveraging Extensions (SIMPLE) network interface
■ User status information, not only device (line) status information
■ IM capabilities, including integration with third-party servers
■ Cisco Unified Personal Communicator, which is a client tool that integrates voice,
video, audio conferencing, videoconferencing, and IM communications
Presence Support in CUCM
CUCM Presence is natively supported by CUCM, with no extra products or servers
required. It allows an interested party (watcher) to monitor the real-time status of a DN
(Presence entity).
A watcher subscribes to the status information of one or more Presence entities. The status
information of a Presence entity can be viewed using Presence-enabled speed dials or
Presence-enabled lists: call lists such as placed, received, or missed calls and public
directory lists.
The status can be one of the following:
■ Unknown (shown when the watched device is unregistered)
■ On-hook
■ Off-hook
NOTE This lesson covers the CUCM Presence feature only.
Presence Support in CUCM 437
In Figure 17-1, John’s phone has subscribed to the status of Bryan’s primary DN. The
CUCM Presence feature will now keep Bryan’s phone updated about the status of the
subscribed Presence entity.
If Bryan goes off-hook while John is browsing the call list that includes Bryan’s DN, the
status information for Bryan’s phone changes to indicate Bryan’s availability (off-hook).
If John has a Presence-enabled speed dial for Bryan’s DN, the speed dial displays the
current status of Bryan’s DN. John’s phone also subscribes to the status of the other
Presence entities (users) of the call list automatically as the call list is viewed.
Figure 17-1 Presence Operation
2. Bryan’s Phone
Goes Off-Hook
Off-Hook
Line 5697 Is Busy
1. John Has Subscribed for
Status of Bryan’s Phone
3. Information About Bryan’s
Phone Is Sent to John’s
Phone
4. John’s Phone Shows Bryan’s
Phone in Off-Hook State
IP
IP
438 Chapter 17: Presence-Enabled Speed Dials and Lists
CUCM Presence allows DNs to be watched by Cisco IP Phones on the same cluster and by
devices on remote clusters through a SIP trunk. Endpoints that can be reached through a
SIP trunk can be watched by Cisco IP Phones, and SIP devices can watch Presence status
over other trunk types in addition to SIP. Cisco IP Phones running Skinny Client Control
Protocol (SCCP) and Cisco IP Phones running SIP can watch Presence entities and can be
watched. If Presence subscriptions are sent over a SIP trunk, CUCM handles protocol
conversion between SCCP and SIP.
Cisco IP Phones can display status information (unknown, on-hook, or off-hook) of
Presence entities by using Presence-enabled speed dials or call and directory list entries, as
shown in Figure 17-2.
Figure 17-2 Presence Operation
Presence-enabled speed dials show a symbol inside the screen of the IP phone, located at
the appropriate speed dial button. Type B Cisco Unified IP Phones have an LED inside the
speed dial button and indicate the Presence entity status by an illuminated button (red
indicates off-hook).
The 7914 sidecar module, which adds 14 additional buttons to a Cisco Unified IP Phone,
does not support Presence when running SIP. The 7940 and 7960 IP Phones also do not
support Presence running SIP. These phones support Presence when using SCCP. Type B
Cisco Unified IP Phone models 79x1, 79x2, 79x5, and 7970 support Presence-enabled call
and directory lists and Presence-enabled speed dials regardless of the protocol used (SIP or
SCCP).
Cisco IP Communicator 2.1 also supports both Presence-enabled speed dials and Presenceenabled
call and directory lists. Cisco IP Communicator 2.1 added SIP support.