User manual

1-4
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 Gateway Features
Table 1-2 lists features for specific Cisco gateways.
Encryption support The gateway supports H.235-compliant AES 128 encryption for calls over
IP networks, and H.233 and H.234-compliant AES 128 encryption for
calls over ISDN networks.
H.243 Conference
Control support
The gateway supports the H.243 protocol in ISDN-to-IP calls and in
IP-to-ISDN calls. The gateway identifies the protocol version that an IP
endpoint uses and sends H.239 capabilities only to those endpoints
working with protocol version 4.0 or later.
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
3545 PRI Gateway
Cisco Unified Videoconferencing
3545 Serial Gateway
Supported ports 2 PRI ISDN ports 4 serial 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 60 voice channels.
Transcoding for the 4 supported
multimedia calls.
G.711 (IP) < > G.728 (ISDN) for up
to 20 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