238 Chapter 9: Cisco Uniﬁed Communications Integrations
Understanding the Attributes of Cisco Uniﬁed
Understanding the attributes of a communications integration will help you during installation
and while analyzing integration issues that may arise. This understanding will enable you to
save valuable time when troubleshooting these issues.
To fully beneﬁt from this section, it is recommended that you have the following prerequisite
skills and knowledge (see Chapter 1, “Cisco Uniﬁed Communications System Fundamentals,”
for a quick review of any of these topics):
• Understand basic telephone system terminologies
• Understand Cisco Unity standard features
• Understand Cisco Unity basic call ﬂow
Integrating Cisco Unity and CCM
Computer-based telephone systems are becoming more and more popular. Most of them
communicate via an Ethernet connection. This new method requires new ways of integrating
voice mail with them. Cisco Unity uses the Skinny Client Control Protocol (SCCP) to
communicate directly with Cisco CallManager. Because Cisco Unity and CCM are on separate
servers, each requires some information from the other to communicate. CCM, for example,
must know information such as the names of the voice-mail ports and the extensions that should
be assigned to the voice-mail ports. The Cisco Unity side requires information such as what the
IP addresses are of the CCMs that Cisco Unity will be servicing and what Message Waiting on
and off numbers are assigned in CCM. With each voice-mail port given a speciﬁc name by using
a number sufﬁx incremented for each, Cisco Unity must also know what common preﬁx has
been assigned to the group of ports being conﬁgured.
You can conﬁgure Cisco Unity and CCM in many ways, depending on the customer’s
requirements and the site’s existing network topology.
The issues involved are normally focused on WAN deployments. Most LAN deployments are
very ﬂexible because they have fewer bandwidth constraints. It is important to understand how
all the components interact to determine what works best for the customer. Figure 9-2 illustrates
a Cisco Unity and CCM integration.