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Designing and Deploying Cisco Unified IM and Presence

CUCM Presence Groups

Figure 14-5 illustrates how presence groups add more granularity to the presence functionality.

Figure 14-5

Figure 14-5 CUCM Presence Groups

Devices, directory numbers, and users can be assigned to a presence group, and by default, all users are assigned to the same standard presence group. By default, if the subscribe calling search space (CSS) permits, all watchers can watch all other entities.

A presence group controls the destinations that a watcher can monitor, based on the association of a user with a defined presence group; for example, employees watching managers is disallowed, but managers watching employees is allowed.

When multiple presence groups are defined, as shown in the picture, the Inter-Presence Group Subscribe Policy service parameter is applied. If one group has a relationship to another group via the Use System Default setting, rather than being allowed or disallowed, the value of this service parameter will take effect. If the Inter-Presence Group Subscribe Policy service parameter is set to Disallowed, CUCM will block the request even if the subscribe CSS allows it.

Observe the following guidelines when configuring presence within CUCM:

  • Define a presence policy for presence users.
  • Use subscribe CSSs to control the routing of a watcher presence-based SIP SUBSCRIBE message to the correct destinations.
  • Use presence groups to define sets of similar users and to define whether presence status updates of other user groups are allowed or disallowed.
  • Call list presence capabilities are enabled on a global basis. The user status can be secured by using a presence policy.
  • BLF speed dials are administratively controlled and are not impacted by the presence policy configuration.
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