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Installation and Upgrade Guide for Cisco Unified Videoconferencing 3545 PRI Gateway and 3545 Serial Gateway Release 5.5
OL-14912-01
Chapter 1 Functionality
About Cisco Unified Videoconferencing 3545 Gateway Applications and Topologies
• Conferencing over leased lines (see the “About Conferencing via Leased Lines” section on
page 1-12)
• Communicating with legacy MCU equipment (see the “About IP-to-Legacy MCU Conferencing”
section on page 1-12)
About Multimedia Conferencing
The Cisco PRI gateway enables H.323 endpoints on the IP network to communicate with an H.320
terminal, an ISDN phone, or a regular phone on a circuit-switched public network without having to
connect directly to these networks. The gateway allows all IP network terminals to support video
conferences without connecting every desktop computer to an ISDN line (see Figure 1-1).
Figure 1-1 Multimedia Conferencing through the Gateway
Typical multimedia conferencing applications include:
• Business video conferencing
• Distance learning
• Telemedicine
• Video-enabled call centers
• Telecommuting
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H.323
endpoint
H.323
terminal
ISDN
phone
Regular
phone
H.323
endpoint
Cisco
chassis/unit
with serial
gateway
IP network
PSDN
ISDN