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Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.5
OL-14910-01
Chapter 1 Functionality
About Cisco Unified Videoconferencing 3500 Gateway Applications and Topologies
About Multipoint Conferencing
Together with the Cisco MCU, the Cisco PRI gateway and BRI gateway enable H.320 ISDN terminals
to participate in a mixed ISDN-IP multipoint multimedia conference with IP network endpoints (see
Figure 1-3).
For example, when an H.320 ISDN terminal wants to participate in a multipoint conference with H.323
IP endpoints, the H.320 ISDN terminal can either join the multipoint conference by dialing to the
gateway, or be invited into the conference by one of the participating IP endpoints. In either case, the
gateway connects the ISDN terminal to the Cisco MCU, enabling it to participate in the multipoint
conference.
Figure 1-3 Mixed ISDN-IP Multipoint Multimedia Conference
About Gateway IP Network Connections
The Cisco PRI gateway and BRI gateway feature one 10/100Base-T Ethernet IP port (on the front panel)
and connect to an IP segment through a direct connection to a network switch.
About Gateway ISDN Network Connections
The Cisco BRI gateway features four BRI ISDN connections. Each BRI line provides two B channels
and one D signalling channel.
H.323
T
erminal
92871
H.323
T
erminal
H.323
T
erminal
H.323
T
erminal
H.323
T
erminal
H.320
Terminal
H.320
Terminal
H.320
Terminal
IP phone
IP
network
IP
IP phone
IP
ISDN
Cisco IPVC
Gateway
Cisco IPVC MCU
Cisco IPVC
chassis/unit