Deployment Models

This topic describes the supported Cisco Unity Express deployment models.

Cisco Unity Express can be deployed in a centralized or distributed call control environment:

  • Centralized Cisco Unified Communications Manager
  • Distributed Cisco Unified Communications Manager Express

Cisco Unity Express also supports three primary messaging deployment models:

  • Single-site messaging
  • Multisite WAN deployment with centralized messaging
  • Multisite WAN deployment with distributed messaging using VPIM for networking

Although the call-processing deployment models for Cisco Unified Communications Manager and Cisco Unified Communications Manager Express are independent of the messaging deployment models in Cisco Unity Express, each has implications for the other that must be considered.

  • Ideal for branch office deployments
  • Integrated Cisco Unity Express and Cisco Unified Communications Manager Express router
  • Variety of office sizes: Up to 500 mailboxes
  • Voicemail, Integrated Messaging, auto-attendant, and optional IVR and timecard services

In the single-site messaging model, the messaging systems and messaging infrastructure components are all located at the same site, on the same highly available LAN. The site can be either a single site or a campus site that is interconnected via high-speed MANs. All clients of the messaging system are also located at the single (or campus) site. The key distinguishing feature of this model is that there are no remote clients.

A single-site Cisco Unity Express and Cisco Unified Communications Manager Express deployment provides an all-in-one Cisco Collaboration Systems solution with voicemail, auto-attendant, timecard, and IVR functionalities at a lower cost. This type of deployment is ideal for small to medium-sized businesses or branch sites that require a complete voicemail solution without depending on other sites.

This type of solution provides deployment flexibility and application integration with fewer devices to manage. The result is a cost-effective, integrated Cisco voicemail solution for IP phones in the branch or remote office as part of the full-service branch.

The same solution could use Cisco Unified Communications Manager instead of Cisco Unified Communications Manager Express, but the cost would be significantly greater.

Cisco Unity Express supports multiple Cisco Unified Communications Manager Express remote sites:

  • Centralized voicemail and auto-attendant features
  • Ideal with a few users at each remote site

In the centralized messaging model, like the single-site model, all the messaging system and messaging infrastructure components are located at the same site. The site can be one physical site or a campus site that is interconnected via high-speed MANs. However, unlike the single-site model, centralized messaging clients can be located both locally and remotely. Cisco Unity Express supports multiple Cisco Unified Communications Manager Express remote sites. This type of deployment ensures centralized voicemail and auto-attendant features and is ideal for an environment with only a few users at each remote site.

Because messaging clients may be either local or remote, special design considerations apply to the following clients: Cisco Unity ViewMail for Outlook (Cisco Unity VMO), the use of the TRAP, and message-streaming features. Remote clients should not use TRAP and should be configured to download messages before playback. Because different features and operations for local and remote clients can cause user confusion, TRAP should be disabled on the voice ports. GUI clients should be configured to download messages and not use TRAP, regardless of whether the client is local or remote. This procedure also applies to Cisco Unity VMO for Cisco Unity Connection IMAP clients. The Cisco Unity Express TUI operates the same way for both local and remote clients.

  • Cisco Unity Express provides distributed voicemail at each remote office. Voicemail messages are sent between systems.
  • Integration with other products using VPIM:
    1. Cisco Unity Connection
    2. Third-party products

A distributed messaging model consists of multiple single-site messaging systems that are distributed with a common messaging backbone. There can be multiple locations, each with its own messaging system and messaging infrastructure components. All client access is local to each messaging system, and the messaging systems share a messaging backbone that spans all locations. Message delivery from the distributed messaging systems occurs via the messaging backbone through a full-mesh or hub-and-spoke type of message-routing infrastructure.

In the distributed messaging model, Cisco Unity Express provides distributed voicemail to each remote office. The result is efficient networking of Cisco Unity Express systems across different locations. For interbranch communications, voicemail messages are sent between Cisco Unity Express systems at each site.

Author: drbabbers

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