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6-2
Design Guide for Cisco Unity Release 5.x
OL-14619-01
Chapter 6 Integrating Cisco Unity with the Phone System
How an Integration Works
Cisco Unity can integrate with one or more phone systems at the same time. For details, see the Multiple
Phone System Integration Guide for Cisco
Unity 5.0 at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_installation_and_configuration_g
uides_list.html.
Circuit-switched phone systems can integrate with Cisco Unity by using one of the following integration
methods:
For detailed information on integrating Cisco Unity with a specific phone system, see the applicable
Cisco
Unity integration guide at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_installation_and_configuration_g
uides_list.html.
How an Integration Works
An integration depends on the following components to be successful:
• Lines and cables necessary to make physical connections (in circuit-switched phone systems) or a
network connection (in Cisco Unified Communications Manager
(CM) (formerly known as Cisco
Unified CallManager) and SIP proxy servers). For more information, see the
“Lines and Cables to
Make Physical Connections” section on page 6-3.
• Settings in the phone system and in Cisco Unity. For more information, see the “Settings in the
Phone System and in Cisco Unity” section on page 6-7.
• Call information exchanged by the phone system and Cisco Unity. For more information, see the
“Call Information Exchanged by the Phone System and Cisco Unity” section on page 6-7.
• Call control (signals used to set up, monitor, and tear down a call) to determine and control the status
of the call. For more information, see the
“Call Control” section on page 6-8.
PIMG/TIMG integrations
PIMG or TIMG units are media gateways between circuit-switched phone
systems and IP networks. On the circuit-switched phone system side, there are
digital (feature-set), analog, and T1-CAS interfaces. On the IP side, there is a
SIP interface, which is how Cisco
Unity communicates with the PIMG unit.
PIMG/TIMG units are the preferred method for integrating with
circuit-switched phone systems.
Voice card integrations
Voice cards connect circuit-switched phone systems and Cisco Unity through
analog lines. Voice cards must be installed in the Cisco
Unity server or in an
expansion chassis that is connected to the Cisco
Unity server.
Support for voice cards is slowly being phased out, and voice cards are now
only supported when Windows 2000 Server is installed on the Cisco
Unity
server. For information on the voice cards supported for use with Cisco
Unity,
see Supported Hardware and Software, and Support Policies for Cisco
Unity
Release 5.x at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/prod_installation
_guides_list.html.