Cisco Systems OL-14619-01 manual Description of TIMG Integrations, 6-26

Chapter 6 Integrating Cisco Unity with the Phone System

Integrating with Circuit-Switched Phone Systems by Using PIMG or TIMG Units

Figure 6-14 Connections for a Serial (SMDI, MCI, or MD-110) Integration by Using Analog PIMG Units

Additional

slave PIMG units

as needed

Slave PIMG unit

(calls only)

LAN/WAN

Master PIMG unit

Phone(SMDI data and calls) system

Analog lines

RS-232 serial cable

Network connections

Cisco Unity

server

153567

Note When you use multiple PIMG units, one PIMG unit must be designated the master PIMG unit, which will be connected to the serial cable. It is not possible to “daisy chain” the serial ports on the PIMG units.

You can add a secondary master PIMG unit to an integration. For details, see the PIMG Integration Guide at http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_installation_and_configuration_g uides_list.html.

Description of TIMG Integrations

The TIMG integration uses one or more TIMG units between circuit-switched phone systems and IP networks. On the circuit-switched phone system side, there is a T1-CAS interface. On the IP side, there is a SIP interface, which is how Cisco Unity communicates with the TIMG unit. To Cisco Unity, the integration is essentially a SIP integration. Cisco Unity communicates with the TIMG unit over the IP network using SIP and RTP protocols. The TIMG unit communicates with the circuit-switched phone system over the phone network using serial protocols (SMDI, MCI, or MD-110).

The phone system sends call information and MWI requests through the data link, which is an RS-232 serial cable that connects the phone system and the master TIMG unit. Voice connections are sent through the T1 digital lines between the phone system and the TIMG units. The TIMG units communicate with the Cisco Unity server through the LAN or WAN by using SIP. Figure 6-15shows the connections.

	Design Guide for Cisco Unity Release 5.x
6-26	OL-14619-01