Version 5.2 15 September 2007
SIP User's Manual 1. Overview
1 Overview
This manual provides you with the information for installing, configuring, and operating the
Mediant 2000 SIP gateway, TP-1610 SIP cPCI board, and TP-260 SIP PCI board. As
these products have similar functionality (with the exception of their physical layout and the
number of trunks), they are collectively referred to throughout this manual (unless
otherwise specified) as the gateway.
1.1 SIP Overview
Session Initialization Protocol (SIP) is an application-layer control (signaling) protocol used
on the gateway for creating, modifying, and terminating sessions with one or more
participants. These sessions can include Internet telephone calls, media announcements,
and conferences.
SIP invitations are used to create sessions and carry session descriptions that enable
participants to agree on a set of compatible media types. SIP uses elements called Proxy
servers to help route requests to the user's current location, authenticate and authorize
users for services, implement provider call-routing policies and provide features to users.
SIP also provides a registration function that enables users to upload their current locations
for use by Proxy servers. SIP implemented in the gateway, complies with the Internet
Engineering Task Force (IETF) RFC 3261 (refer to http://www.ietf.org
).
1.2 Mediant 2000 Overview
The Mediant 2000 system is a SIP-based Voice-over-IP (VoIP) media gateway. Mediant
2000 enables voice, fax, and data traffic to be sent over the same IP network.
The Mediant 2000 provides excellent voice quality and optimized packet voice streaming
over IP networks. The Mediant 2000 uses the award-winning, field-proven VoIPerfect™
voice compression technology, typically implemented in AudioCodes products.
The Mediant 2000 incorporates 1, 2, 4, 8 or 16 E1, T1, or J1 spans for direct connection to
the Public Switched Telephone Network (PSTN) / Private Branch Exchange (PBX) through
digital telephony trunks. The gateway also includes two 10/100 Base-TX Ethernet ports,
providing redundancy connection to the network.
The Mediant 2000 supports up to 480 simultaneous VoIP or Fax over IP (FoIP) calls,
supporting various Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI)
protocols such as EuroISDN, North American NI2, Lucent™ 4/5ESS, Nortel
™
DMS100 and
others. In addition, it supports different variants of Channel Associated Signaling (CAS)
protocols for E1 and T1 spans, including MFC R2, E&M immediate start, E&M delay
dial/start, loop start and ground start.
The gateway, best suited for large and medium-sized VoIP applications, is a compact
device, comprising a 19-inch, 1U chassis with optional dual AC or single DC power
supplies. The deployment architecture can include several gateways in branch or
departmental offices, connected to local PBXs. Call routing is performed by the gateways
using internal routing or SIP Proxy(s).
The gateway enables users to make cost-effective, long distance or international
telephone/fax calls between distributed company offices, using their existing
telephones/fax. These calls can be routed over the existing network using state-of-the-art
compression techniques, ensuring that voice traffic uses minimum bandwidth.
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