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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 Express (by Using SCCP or SIP)
Multiple Cisco Unified Communications Manager Express Routers Integrating
with a Single Cisco
Unity Server
A single, centralized Cisco Unity server can be used by multiple Cisco Unified CM Express routers. This
configuration requires that one Cisco Unified
CM Express router be on the same LAN or WAN as the
Cisco
Unity server, and that this Cisco Unified CM Express router register all Cisco Unity voice
messaging ports. The Cisco Unified
CM Express router (the SIP MWI server) is a proxy server that
relays SIP MWI messages between the Cisco
Unity and all other Cisco Unified CM Express routers (the
SIP MWI clients). Note that Cisco
Unity voice messaging ports register with only the SIP MWI server
(the Cisco Unified
CM Express router that is on the same LAN as the Cisco Unity server), not with the
SIP MWI clients.
Figure 6-9 Connections Between Multiple Cisco Unified CM Express Routers and a Single
Cisco
Unity Server
For information on configuring Cisco Unity to support multiple Cisco Unified CM Express routers, see
the applicable Cisco
Unity integration guide at
http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_installation_and_configuration_g
uides_list.html.
Integrating Cisco Unity with Cisco Survivable Remote Site Telephony (Cisco
SRST)
Cisco Unified Survivable Remote Site Telephony (SRST) can send and receive voice messages from
Cisco
Unity during Cisco Unified CM fallback. When the WAN is down and Cisco Unity has Basic Rate
Interface (BRI) or Primary Rate Interface (PRI) access to the Cisco SRST system, Cisco
Unity uses
ISDN signaling (see
Figure 6-10).
Cisco
Unity server
Cisco Unified
Communications
Manager
Express
LANPSTN
191851
Cisco Unified
Communications
Manager
Express
SIP MWI server SIP MWI client