Cisco Systems 3522 BRI, 3527 PRI manual Functionality

Chapter 1 Functionality

			About Gateway Features
	Table 1-1	Gateway Feature Summary (continued)
	Feature		Description
	DTMF translation		The gateway supports translation between in-band Dual Tone
			Multi-Frequency (DTMF) signals (on the ISDN side) and out-of-band
			H.245 messages (on the IP side). DTMF translation occurs for voice and
			video calls.
	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		The gateway features ISDN rollover. In this feature, the gateway sends a
	(available in		“busy out” channel request to the PSTN switch when the current PRI
	Cisco Unified		connection is left with less than a predefined number of available B
	Videoconferencing 35		channels. The PSTN switch “rolls over” to the next available gateway.
	27 PRI Gateway only)
	Network Specific		The gateway provides support for Network Specific Facility Information
	Facility (available in		Elements (NSF IEs) which enable system administrators to specify to
	Cisco Unified		service providers the equipment, service, or network through which they
	Videoconferencing 35		want a call routed.
	27 PRI Gateway only)
	ISDN connection		The gateway responds to ISDN connection failure events, by unregistering
	failure		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		The gateway supports up to three SNMP trap servers.
	support
	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		The gateway supports the H.243 protocol in ISDN-to-IP calls and in
	Control support		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.
Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.5
OL-14910-01				1-3