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CUCM extends enterprise telephony features and functions to packet telephony network
devices. These packet telephony network devices include Cisco IP Phones, mediaprocessing
devices, VoIP gateways, and multimedia applications. Additional data, voice,
and video services, such as converged messaging, multimedia conferencing, collaborative
contact centers, and interactive multimedia response systems, interact with the IP telephony
solution through the CUCM application programming interface (API).
CUCM provides these functions:
■ Call processing: Call processing refers to the complete process of originating, routing,
and terminating calls, including any billing and statistical collection processes.
CUCM Overview 9
■ Signaling and device control: CUCM sets up all the signaling connections between
call endpoints and directs devices such as phones, gateways, and conference bridges to
establish and tear down streaming connections. Signaling is also referred to as call
control and call setup/call teardown.
■ Dial plan administration: The dial plan is a set of configurable lists that CUCM uses
to perform call routing. CUCM is responsible for digit analysis of all calls. CUCM
enables users to create scalable dial plans.
■ Phone feature administration: CUCM extends services such as hold, transfer,
forward, conference, speed dial, redial, call park, and many other features to IP phones
and gateways.
■ Directory services: CUCM uses its own database to store user information. User
authentication is performed locally or against an external directory. Directory
synchronization allows for centralized user management. Directory synchronization
allows CUCM to leverage users already configured in a corporate-wide directory.
Microsoft Active Directory (2000 and 2003), Netscape 4.x, iPlanet 5.1, and Sun ONE
5.2 directory integrations are supported. The local CUCM database is a Lightweight
Directory Access Protocol (LDAP)-compliant database (LDAPv3) component in the
IBM Informix Database Server (IDS).
■ Programming interface to external applications: CUCM provides a programming
interface to external applications such as Cisco IP SoftPhone, Cisco IP Communicator,
Cisco Unified IP Interactive Voice Response (IP IVR), Cisco Personal Assistant, Cisco
Unified Personal Communicator, and CUCM Attendant Console.
■ Backup and restore tools: CUCM provides a Disaster Recovery System (DRS) to
back up and restore the CUCM configuration database. The DRS system also backs up
call details records (CDR), call management records (CMR), and the CDR Analysis
and Reporting (CAR) database.
Figure 1-3 shows IP phones that logically register with one of the CUCMs in the cluster.
Multiple CUCM servers share one database, and the phone maintains an active connection
to both the primary and backup CUCM server. The figure shows the phone’s logical TCP/
IP connections to the primary server.