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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 Gateway Features
Table 1-2 lists features for specific Cisco gateways.
Peer-to-peer
connectivity
The gateway supports connectivity to the IP network through a gatekeeper,
or directly to a peer device such as Cisco Unified Communications
Manager.
IP network
connections
The gateway has one 10/100Base-T Ethernet IP port (on the front panel)
and connects to an IP segment through a direct connection to a network
switch.
Table 1-1 Gateway Feature Summary (continued)
Feature Description
Table 1-2 Cisco Gateway Feature Specifics
Feature Cisco Unified
Videoconferencing 3527 PRI Gateway
Cisco Unified
Videoconferencing 3522 BRI Gateway
Supported ports 1 PRI ISDN port 4 BRI ISDN ports
Supported video
conferencing protocols
H.320, H.323 (using Cisco Stack v4.0)
Supported audio
codecs
The term audio transcoded video calls refers to the process whereby an audio
stream in a multimedia call can be transcoded from one codec type to another.
Basic and advanced audio coding supported codecs: G.711, G.722, G.722.1,
G.723.1, G.728
Audio Transcoding G.711 (ISDN) < > G.723.1 (IP) for up
to 30 voice channels.
G.711 (ISDN) < > G.723.1 (IP) for up
to 8 voice channels.
G.711 (IP) < > G.728 (ISDN) for up to
20 audio transcoded video channels.
G.711 (IP) < > G.728 (ISDN) for up to
8 audio transcoded video channels.
The gateway automatically performs
A-Law G.711-to-µ-Law G.711
translation between the IP and ISDN
sides if needed.
Note When your Cisco unit
includes both a gateway and a
MCU, G.728 transcoding is
supported on the MCU only.
Supported video
protocols
H.261, H.263, H.263+ (Annexes F, J and N), H.263++ (Annex W), H.264
Supported video
resolutions
VGA, XGA, SVGA, SIF, 4SIF, CIF, QCIF, 4CIF, 16CIF
Supported bandwidths
(Kbps)
56, 64, 112, 128, 168, 192, 224, 256,
280, 320, 336, 384, 448, 512, 672,
768, 1288, 1472, 1680 and 1920
56, 64, 112, 128, 224, 256, 336, 384
and 512
Note Bandwidth rates of 256 Kbps and up support the G.722 audio codec.