1-3
Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.6
OL-17010-01
Chapter 1 Functionality
About Gateway Features
Tabl e 1-2 lists features for specific Cisco gateways.
Dual video The gateway supports H.239 standards-based dual video and TANDBERG
DuoVideo technology. Dual video streams enable a screen to carry video images
from one source while simultaneously displaying images from a second source.
Conceal caller ID The gateway supports a conceal caller ID feature that instructs the gatekeeper to
conceal the identity of the calling endpoint on the IP or ISDN network, whether
the presentation restricted feature is enabled or not.
H.323 fast start The gateway H.323 fast start feature enables endpoints to join a voice conference
in the gateway more quickly.
ISDN rollover (available in Cisco Unified
Videoconferencing 3527 PRI Gateway
only)
The gateway features ISDN rollover. In this feature, the gateway sends a “busy
out” channel request to the PSTN switch when the current PRI connection is left
with less than a predefined number of available B channels. The PSTN switch
“rolls over” to the next available gateway.
Network Specific Facility (available in
Cisco Unified
Videoconferencing 3527 PRI Gateway
only)
The gateway provides support for Network Specific Facility Information
Elements (NSF IEs) which enable system administrators to specify to service
providers the equipment, service, or network through which they want a call
routed.
ISDN connection failure The gateway responds to ISDN connection failure events, by unregistering from
its gatekeeper. The gatekeeper is forced to send new IP-to-ISDN calls through a
different gateway, thus ensuring high call completion rates. The gateway
re-registers to the gatekeeper when the ISDN connection is restored.
Downspeeding The gateway features downspeeding functionality. In the downspeeding feature,
the gateway attempts to reconnect a disconnected video call either at a lower
bandwidth or as a voice call. Downspeeding contributes to a higher percentage of
call completion on the network. The gateway supports downspeeding at call setup
and in mid-call.
Multiple trap server support The gateway supports up to three SNMP trap servers.
H.239 support The gateway supports the H.239 protocol in ISDN-to-IP calls and in IP-to-ISDN
calls.
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