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© 2011 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 5 of 11
Table 6. Voice Messaging Licensing for the Cisco UC 540
Configuration Voice Messaging Licenses
24-user system 65 mailboxes*
32-user system 65 mailboxes*
Sessions to voicemail and automated attendant 6
Internet Message Access Protocol (IMAP) sessions 20**
* 32 hours of voicemail storage is available by default across all user configurations. Any combination of personal mailboxes and
general delivery mailboxes can be used.
** There are 20 simultaneous sessions available between IMAP Client and IMAP server. If all 20 sessions are used up, the
remaining session requests will be rejected by the IMAP server. IMAP clients will automatically attempt to establish session with
the server once some of the server ports are freed up. This does not limit the number of IMAP clients to 20.
Basic Call Center Capabilities
The Cisco UC 540 supports basic automatic call distribution (BACD) that can help answer outside calls with
greetings and menus and allow callers to select the appropriate departments. BACD also provides managed call
queues for calls that are waiting to be answered. Table 7 lists the BACD capabilities of the UC 540.
Table 7. Cisco UC 540 BACD Capabilities
Feature Number
Hunt groups associated with a BACD 10
Calls allowed in each call queue 30
Agents (members) for each hunt group 20
Statistics accumulated for all BACD groups 168 hours
Hunt groups used with automated attendant 3
In addition to BACD, the Cisco UC 540 integrates with Cisco Unified Contact Center Express (UCCX). UCCX
works with up to a maximum of 12 users (agents and supervisor combined) on the UC 540.
Voice Resource Utilization
The Cisco UC 540 includes four digital signal processors (DSPs) that enable digitized voice processing on the
platform. The DSP resources available on the platform are used for various unified communications features,
namely support of analog and digital VICs, prescheduled or ad hoc voice conference calls, and translation of
digitized voice from a less complex codec (such as g711) to a more complex codec (such as g729) - typically used
for deployments that use IP trunking (SIP or H.323) for PSTN access or multisite interconnection.
Each DSP can support 16 g711 channels or 8 g729 channels. This enables a total of 64 g711 channels on the
Cisco UC 540. Table 8 indicates the DSP resource utilization based on the feature. Tables 9 and 10 show a few
deployment scenarios based on the combination of these features.
Table 8. DSP Resource Utilization on the Cisco UC 540
Feature DSP Resource Utilization
Support for built-in FXS ports 4 channels
Support for built-in FXO ports 4 channels
Support for built-in music on hold (MoH) port 2 channels