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Design Guide for Cisco Unity Release 5.x
OL-14619-01
Chapter 6 Integrating Cisco Unity with the Phone System
Integrating with Cisco Unified Communications Manager (by Using SCCP or SIP)
• Circuit-switched phone systems that connect to voice cards and that use an RS-232 serial cable for
the integration must be within 50 feet of the Cisco
Unity server. For serial cable specifications, see
the applicable Cisco
Unity integration guide at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_installation_and_configuratio
n_guides_list.html.
• Voice card integrations are supported only when Windows 2000 Server is installed on the
Cisco
Unity server. For a list of supported voice cards, 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.
• The license file for Cisco Unity may enable more voice messaging ports than the customer needs.
Install only the number of ports that are needed, so that system resources are not allocated to unused
ports, and do not exceed the port limitations set for the platform. For more information, see the
Cisco
Unity Supported Platform List at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_data_sheets_list.html). For
additional information about configuring voice messaging ports, see the “Planning How the Voice
Messaging Ports Will Be Used in Cisco
Unity” section in the applicable Cisco Unity integration
guide at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_installation_and_configuratio
n_guides_list.html.
Integrating with Cisco Unified Communications Manager (by
Using SCCP or SIP)
Cisco Unity supports Cisco Unified Communications Manager (CM) (formerly known as Cisco Unified
CallManager) integrations through both SCCP and SIP interfaces.
Table 6-1 shows the major differences
in these integration methods.
Table 6-1 Differences Between SCCP and SIP Integration Methods
Feature SCCP SIP
Communication method Cisco Unity-CM TSP SIP trunk
Failover Supported Not supported
Use of SCCP and SIP phones Supported Some SCCP phones may require
use of a media termination point
(MTP)
Support for Cisco Unified CM
versions
All versions Versions 5.x and later
Cisco Unified CM versions 5.x
and later
Supported Supported
Cisco Unified CM
authentication and encryption
Supported Not supported
First/last redirecting number Supported Supported
QOS Supported Supported