The annunciator enables
Cisco Unified Communications
Manager to play prerecorded announcements (.wav files) and to send
tones to devices such as Cisco Unified IP Phones and gateways. Announcements
are played for devices that are configured for Cisco Multilevel Precedence and
When you add a node, an annunciator device is automatically
added for that node. The annunciator remains inactive until the Cisco IP
Voice Media Streaming Application service is activated on the node.
We recommend that you do not activate the annunciator on Cisco Unified Communications
Manager nodes that have a high call-processing load.
An annunciator supports 48 simultaneous media streams by default. You can change the default number of annunciator media streams using the annunciator service parameter; however, we recommend that you do not exceed 48 annunciator streams on a node.
If the annunciator runs on a dedicated subscriber node where the Cisco Unified Communications Manager service does not run, the annunciator can support up to 255 simultaneous announcement streams. If the dedicated subscriber node meets the OVA virtual machine configuration for 10,000 users, the annunciator can support up to 400 simultaneous announcement streams.
If the node uses IPv6, the annunciator supports both IPv4 and IPv6 audio media connections and is configured automatically in dual mode. Otherwise, the annunciator is configured automatically for IPv4 only mode.
For Cisco Unified Communications Manager nodes that have Secure Real-Time Protocol (SRTP) enabled, the annunciator automatically registers as a secured SRTP device. Optionally, you can choose not to encrypt announcements and tones when the annunciator is operating in secured mode.
To manage the media resources, you can add the annunciator to media resource groups and lists. The annunciator also supports serviceability performance counters. For example, you can monitor the number of streams that are used, which streams are
currently active, the total number of streams that are available for use, and the number of failed annunciator streams. You can also use the Real-Time Monitoring Tool (RTMT) to retrieve Cisco IP Voice Media Streaming App traces to troubleshoot the annunciator performance.
For more information about monitoring media stream activity and status, see the Cisco Unified Serviceability Administration Guide and the Cisco Unified Real-Time Monitoring Tool Administration Guide.