Cisco Systems OL-14619-01 manual Description of PIMG Integrations, 6-24

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 6-12shows the connections for a digital integration by using digital PIMG units.

Figure 6-12 Connections for a Digital Integration by Using Digital PIMG Units

Phone system

Additional

PIMG units as needed

PIMG unit

LAN/WAN PIMG unit

Digital lines

Network connections

Cisco Unity server

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