CCIE Voice Study

Cisco Communications Manager Express (CME) provides the ability for presence capabilities, permitting users to monitor the busy status of other local users. Presence allows users to subscribe to change in the line status of phones in the Cisco Unified CME system. This article walks through configuring the CME system with a single presence subscription, and details the steps for verification.

In CME, configuring presence requires:

1. Enabling presence globally
2. Allowing a DN to be monitored (watched)
3. Configuring a busy-lamp speed dial on watcher's phone
4. (Optionally) Allowing monitoring from the call lists (corporate directory, missed calls, etc.)

The minimum configuration required to configure basic Presence is as follows.

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BLF for Call Lists is controlled by the Enterprise Parameter "BLF for Call Lists" (default is false)

This parameter allows users to review BLF status for extensions in the call lists (per Presence group status rules). The SUBSCRIBE CSS on the Phone must be set (or under the user for EM). This allows users to get the same information in the Directories Lists, accessed via the Phone UI, as if a BLF was setup on the phone, or under the EM profile.

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To setup basic BLF speed-dial on a fixed phone (no Extension Mobility):

• Assign the lines and phones to the Standard Presence Group (auto reg phones are assigned to this group by default)
• Assign the phones, or users when using EM, to a SUBSCRIBE Calling Search Space which includes the DN of the monitored extension (only the phone or EM user performing the monitoring matters; the monitored phone SUBSCRIBE CSS has no impact).
• Assign a BLF Speed Dial to one of the phones
• Reset

Et voila, the BLF speed dial is setup from Phone A to Phone B. Next is Directory-based BLF and Presence Authorization (intra- and inter-cluster).

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