CHAPTER
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Ericsson MD-110 Serial Integration Guide
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Dual Phone System Integration
Cisco Unity can be integrated with one each of the following phone system s at the
same time:
A traditional, circuit-switched phone system. Any traditional phone system
that CiscoUnity integrates with can be used in a dual phone system
integration.
Cisco CallManager.
All extensions for subscribers and call handlers must be unique regardless of
which phone system a subscriber (or call handler) uses. To transfer calls from one
phone system to the other, Cisco Unity must dial the same access codes that a
subscriber dials when calling someone on the other phone syst em.

Dual Phone System Integration Overview

Before performing the following integration steps, confirm that the Cisco Unity
server is ready for the integration by completing the appropriate tasks in Chapters
1 through 3 of the Cisco Unity Installation Guide.

Integration Steps When No Phone Systems Are Installed

Follow these steps to set up the dual phone system integration when no phone
systems are installed.
1. Install the traditional phone system.