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)

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

Figure 17-1 Presence Operation

2. Bryan's Phone Goes Off-Hook

Off-Hook

2. Bryan's Phone Goes Off-Hook

Off-Hook

ojv 3. Information About Bryan's §7 Phone Is Sent to John's Phone

1. John Has Subscribed for Status of Bryan's Phone

1. John Has Subscribed for Status of Bryan's Phone

4. John's Phone Shows Bryan's Phone in Off-Hook State

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

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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 Presence-enabled call and directory lists. Cisco IP Communicator 2.1 added SIP support.

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