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Design Guide for Cisco Unity Release 5.x
OL-14619-01
Chapter 6 Integrating Cisco Unity with the Phone System
How an Integration Works
Figure 6-5 Connections for an Integration by Using TIMG Units
DTMF Integration with Voice Cards
The circuit-switched phone systems use analog lines to carry voice connections, call information, and
MWI activation requests. The lines connect the ports on the phone system to the voice messaging ports
on voice cards installed on the Cisco
Unity server. Signaling carried across the analog lines is achieved
through DTMF digits being sent to and from the phone system and Cisco
Unity. For example, in order
for Cisco
Unity to turn on or off the MWI lamp, DTMF digits (including #, *, and the digits 0–9) are
sent from Cisco
Unity to the phone system. Figure 6-6 shows the connections used in a DTMF
integration.
Figure 6-6 Connections for a DTMF Integration by Using Voice Cards
Serial Integration with Voice Cards
In serial integrations (also called SMDI or MCI integrations for NEC phone systems), circuit-switched
phone systems use an RS-232 serial cable to carry call information and MWI activation requests. The
serial cable connects the serial port on the phone system to the serial port on the Cisco
Unity server.
(Some phone systems require hardware such as a modem or PBXLink box to connect to the serial cable.)
Figure 6-7 shows the connections.
T1 digital lines (one or more)
RS-232 serial cable
Network connections
Cisco Unity
server
190676
LAN/WAN
Master TIMG unit
(SMDI data and calls)
Additional
slave
TIMG units
as needed
Slave TIMG unit
(calls only)
Phone
system
Analog lines
Phone system
Cisco Unity server
55417