240 Chapter 9: Cisco Unified Communications Integrations
Figure 9-3 Cisco PA and CCM Integration
Understanding the Types of Cisco Unified
Communications Integrations
A Cisco Unity system uses the services of a telephone system, either circuit-switched or packet-
switched, to perform its essential functions. Functions such as automated attendant, voicemail,
and audiotext work because of an established relationship with a telephone system.
Understanding the relationship between a telephone system and a Cisco Unity voice-processing
system and its integrations contributes to the proper installation and troubleshooting of Cisco
Unity.
To fully benefit from this section, it is recommended that you have the following prerequisite
skills and knowledge (see Chapter 1 for more information on any of these topics):
Knowledge of the basic telephone features used with voice mail
The ability to list the telephone switch integrations supported by Cisco Unity 4.0
Knowledge of the standard features of Cisco Unity
Knowledge of the standard features of Cisco PA
Cisco
Unity
Server
IP Phones
Branch
U
U
PSTN
IP Network
2
1
V
V
4
3
Cisco
SoftPhone
Central
Site
Cisco Call Manager
Directory
Customer
PA
PA
Switch
Understanding the Types of Cisco Unified Communications Integrations 241
Integrating with IP
Cisco Unity messaging systems integrate with CCM by using the Cisco Unity-CM TAPI
service provider (TSP) in a pure IP environment. Because Cisco Unity and CCM communicate
without the use of traditional voice boards, all call information, including session, signaling,
and audio, travels as packets across the network. Figure 9-4 illustrates a Cisco Unity and CCM
integration.
Figure 9-4 Cisco Unity and CCM Integration
Most Cisco IP telephone models connect to virtual station ports on CCM using the Skinny
Client Control Protocol (SCCP). Cisco developed a TSP that connects to the SCCP layer of
CCM. The SCCP layer is similar to the CTI layer and provides a communication channel to
CCM. All integration functionality remains the same when using this protocol and all TAPI
session and call control is served through the Cisco Unity-CM TSP and SCCP.
NOTE The Cisco TSP referred to is one that comes with the Cisco Unity product. This is different from
the Cisco-TSP that comes with Cisco CallManager.
Cisco Unity 4.0 uses SCCP to provide the call session and signaling information between CCM
and itself. This bidirectional communication between Cisco Unity and CCM takes place via the
Cisco Unity-CM TSP, a piece of software that opens and maintains that communication
channel. The TSP is installed on the Cisco Unity system. You can configure it by using the Cisco
Unity Telephony Integration Manager (UTIM) application.
IP Phones
Workstation
with Microsoft Outlook
MS Exchange
Message Store
U
U
Cisco Unity
Server
SCCP
(Skinny)
PSTN
Gateway
Cisco
CallManager
LAN
Switch

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