Configuring Presence Service
How to Configure Presence Service
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CiscoUnified Communications Manager Express System Administrator Guide
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Figure53 BLF Notification Using Presence
The following line states display through BLF indicators on the phone:
•Line is idle—Displays when this line is not being used.
•Line is in-use—Displays when the line is in the ringing state and when a user is on the line, whether
or not this line can accept a new call.
•BLF indicator unknown—Phone is unregistered or this line is not allowed to be watched.
Cisco Unified CME acts as a presence agent for internal lines (both SIP and SCCP) and as a presence
server for external watchers connected through a SIP trunk, providing the following functionality:
•Processes SUBSCRIBE requests from internal lines to internal lines. Notifies internal subscribers
of any status change.
•Processes incoming SUBSCRIBE requests from a SIP trunk for internal SCCP and SIP lines.
Notifies external subscribers of any status change.
•Sends SUBSCRIBE requests to external presentities on behalf of internal lines. Relays status
responses to internal lines.
Presence subscription requests from SIP trunks can be authenticated and authorized. Local subscription
requests cannot be authenticated.
For configuration information, see the “How to Configure Presence Service” section on page887.
How to Configure Presence Service
This section contains the following tasks:
•Enabling Presence for Internal Lines, page 888
•Enabling a Directory Number to be Watched, page889
•Enabling a SCCP Phone to Monitor BLF Status for Speed-Dials and Call Lists, page 891
•Enabling a SIP Phone to Monitor BLF Status for Speed-Dials and Call Lists, page 893
•Configuring Presence to Watch External Lines, page895
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