See the following sections in this chapter:
•Integrations with Multiple Phone Systems
The Cisco Unified Communications Manager (CM) Express (formerly known as Cisco Unified CallManager Express) SIP trunk integration uses a LAN to connect Cisco Unity Connection and the phone system. The Cisco Unified Communications Manager Express router also provides connections to the PSTN. Figure 1-1 shows the connections.
Figure 1-1 Connections Between the Phone System and Cisco Unity Connection
For a list of supported versions of Cisco Unified CM Express that are qualified to integrate with Cisco Unity Connection through a SIP trunk, see the SIP Trunk Compatibility Matrix: Cisco Unity Connection, Cisco Unified Communications Manager, and Cisco Unified Communications Manager Express at http://www.cisco.com/en/US/products/ps6509/products_device_support_tables_list.html.
This document does not apply to the configuration in which Cisco Unity Connection is installed as Cisco Unified Communications Manager Business Edition (CMBE)—on the same server with Cisco Unified CM.
The phone system sends the following information with forwarded calls:
•The extension of the called party
•The extension of the calling party (for internal calls) or the phone number of the calling party (if it is an external call and the system uses caller ID)
•The reason for the forward (the extension is busy, does not answer, or is set to forward all calls)
Cisco Unity Connection uses this information to answer the call appropriately. For example, a call forwarded to Cisco Unity Connection is answered with the personal greeting of the user. If the phone system routes the call to Cisco Unity Connection without this information, Cisco Unity Connection answers with the opening greeting.
The Cisco Unified CM Express SIP trunk integration with Cisco Unity Connection provides the following features:
•Call forward to personal greeting
•Call forward to busy greeting
•Easy message access (a user can retrieve messages without entering an ID; Cisco Unity Connection identifies a user based on the extension from which the call originated; a password may be required)
•Identified user messaging (Cisco Unity Connection automatically identifies a user who leaves a message during a forwarded internal call, based on the extension from which the call originated)
•Message waiting indication (MWI)
Integrations with Multiple Phone Systems
When Cisco Unity Connection is installed as Cisco Unified Communications Manager Business Edition (CMBE)—on the same server with Cisco Unified Communications Manager—Cisco Unity Connection cannot be integrated with multiple phone systems at one time.
When Cisco Unity Connection is not installed as Cisco Unified CMBE, Cisco Unity Connection can be integrated with two or more phone systems at one time. For information on and instructions for integrating Cisco Unity Connection with multiple phone systems, refer to the Multiple Phone System Integration Guide for Cisco Unity Connection at http://www.cisco.com/en/US/products/ps6509/products_installation_and_configuration_guides_list.html.