Feature Description | Cisco Systems 3522 BRI guide

Chapter 1 Functionality

About Gateway Features

Table 1-1	Gateway Feature Summary (continued)

Feature		Description

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		The gateway features ISDN rollover. In this feature, the gateway sends a “busy
Videoconferencing 3527 PRI Gateway		out” channel request to the PSTN switch when the current PRI connection is left
only)		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		The gateway provides support for Network Specific Facility Information
Cisco Unified		Elements (NSF IEs) which enable system administrators to specify to service
Videoconferencing 3527 PRI Gateway		providers the equipment, service, or network through which they want a call
only)		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 1-2lists features for specific Cisco gateways.

Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.6

	OL-17010-01	1-3

3522 BRI specifications

Cisco Systems has long been a leader in networking and telecommunications equipment, and its BRI (Basic Rate Interface) and PRI (Primary Rate Interface) products are essential components in enabling businesses to manage voice and data communications efficiently. Notable models such as the Cisco 3522 BRI and 3527 PRI have earned recognition for their robust performance and versatile features.

The Cisco 3522 BRI is designed to deliver high-quality voice and data services over ISDN (Integrated Services Digital Network) connections. With two B channels for voice or data transmission, each supporting up to 64 Kbps, this device is ideal for small to medium-sized businesses that require reliable communication solutions while maintaining cost-effectiveness. The Cisco 3522 BRI supports multiple protocols, making it a flexible choice to adapt to various network environments.

On the other hand, the Cisco 3527 PRI supports up to 30 B channels, thereby significantly increasing the capacity for voice calls and data transfer. This scalability makes the 3527 PRI suitable for larger organizations that demand higher throughput and call handling capability. It operates over T1 and E1 lines, allowing businesses to leverage existing infrastructure while improving operational efficiencies. Additionally, the 3527's advanced features, such as call processing and load balancing, contribute to a seamless communication experience.

Both devices support a range of technologies that enhance functionality and performance. They are equipped with Call Admission Control (CAC) to optimize bandwidth use and reduce congestion during peak traffic. Cisco's VoIP technology, including features such as voice provisioning, fax over IP, and QoS (Quality of Service) mechanisms, ensures voice clarity and reliability.

Security is paramount, and both the 3522 and 3527 incorporate various protocols such as SRTP (Secure Real-Time Transport Protocol) to protect voice communications against unauthorized access. Furthermore, integration with Cisco's unified communications offerings allows for a more cohesive communication strategy, ensuring that users can take advantage of collaboration tools and data services.

In conclusion, the Cisco 3522 BRI and 3527 PRI models stand out with their impressive feature sets and technologies, making them an excellent investment for businesses needing reliable, scalable, and secure voice and data communication solutions. Choosing Cisco means embracing a future-proof solution that can grow with your organization's communication needs.