Version 6.2 25 February 2011
SIP User's Manual 1. Overview
1 Overview
The Mediant 800 Multi-Service Business Gateway (MSBG) is a networking device that
combines multiple service functions such as a Media Gateway, Session Border Controller
(SBC), Data Router and Firewall, LAN switch, WAN access, Stand Alone Survivability
(SAS) and an integrated general-purpose server.
The device's data routing capabilities support static and dynamic routing protocols such as
RIP/OSPF and BGP, Virtual Routing and Forwarding (VRF-Lite) where interfaces can be
clustered into a VRF to provide segregated routing domains. In addition, the device
supports copper Gigabit Ethernet, T1 WAN, and Symmetric High-Speed Digital Subscriber
Line (SHDSL) WAN interfaces, providing flexibility in connecting to Service Providers.
The T1 WAN connection is through a dual T1 line interface (according to ANSI
T1.403-1999). The device uses its dual T1 WAN Data Service Unit/Channel Service
Unit (DSU/CSU) port interface to transmit and receive data using IP over Point-to-
Point Protocol (PPP), IP over High-Level Data Link Control (HDLC), or or IP over
Multilink Point-to-Point Protocol (MLPPP) framing.
The SHDSL WAN connection supports up to four copper wire pairs according to
G.991.2, acting as a remote-terminal CPE device. Both ATM and EFM modes are
supported. In the ATM mode, a variety of protocols are supported, including PPPoE,
PPPoA, and RFC 2684 in both bridged (Ethernet-over-ATM) and routed (IP-over-
ATM) variants. In the EFM mode, the SHDSL port functions as a logical Ethernet
device.
The device is designed as a secured Voice-over-IP (VoIP) and data platform. Enhanced
media gateway security features include, for example, SRTP for media, TLS for SIP
control, and IPSec for management. Data security functions include integrated Stateful
Firewall, IDS/IPS, SSL for remote user access, and site-to-site VPN. A fully featured
enterprise class SBC provides a secured voice network deployment based on a Back-to-
Back User Agent (B2BUA) implementation.
The device's SAS functionality offers service continuity to enterprises served by a
centralized SIP-based IP-Centrex server or branch offices of distributed enterprises. SAS
enables internal office communication between SIP clients, along with PSTN fallback in the
case of disconnection from the centralized SIP IP-Centrex server or IP-PBX.
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