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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 Circuit-Switched Phone Systems by Using PIMG or TIMG Units
Integrating with Circuit-Switched Phone Systems by Using
PIMG or TIMG Units
Cisco Unity can integrate with circuit-switched phone systems by using the Dialogic Media Gateway
(PIMG or TIMG units) between circuit-switched phone systems and IP networks.
For a list of circuit-switched phone systems currently supported with Cisco Unity using PIMG and
TIMG integrations, see the “Supported Phone System Integrations” section of 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.
Description of PIMG Integrations
The PIMG integration uses one or more PIMG units between the circuit-switched phone systems and IP
network. On the circuit-switched phone system side, there are both digital (feature-set) and analog
interfaces; the interface used will depend on the phone system to which Cisco
Unity is connected. On
the IP side, there is a SIP interface, which is how Cisco
Unity communicates with the PIMG gateway.
To Cisco
Unity, the integration is essentially a SIP integration. Cisco Unity communicates with the
PIMG gateway over the IP network using SIP and RTP protocols. The PIMG gateway communicates
with the circuit-switched phone system over the phone network using phone system-specific protocols
(digital, analog, serial). Note that there are digital integrations for circuit-switched phone systems from
several vendors, which are tighter integrations than the Cisco
Unity analog integrations using voice
cards.
Digital Integration with Digital PIMG Units
The phone system sends call information, MWI requests, and voice connections through the digital lines,
which connect the phone system to the PIMG units. The PIMG units communicate with the Cisco
Unity
server through the LAN or WAN by using Session Initiation Protocol (SIP).
Figure 6-12 shows the
connections for a digital integration by using digital PIMG units.
Figure 6-12 Connections for a Digital Integration by Using Digital PIMG Units
Digital lines
Network connections
Phone system
Cisco Unity server
104043
LAN/WAN
PIMG unit
Additional
PIMG units
as needed
PIMG unit