Sip Overview; Vcx V7122 Voip Sip Supported Features; General Features; Hardware Features - 3Com VCX V7122 User Manual

T1 Available Configurations:
24 Channels on 1 T1 span with gateway-1 only
48 Channels on 2 T1 spans with gateway-1 only
96 Channels on 4 T1 spans with gateway-1 only
192 Channels on 8 T1 spans with gateway-1 only
384 Channels on 16 T1 spans with gateway-1 and gateway-2

SIP Overview

SIP is an application-layer control (signaling) protocol used on the VCX V7122 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, on the VCX V7122, complies with the IETF (Internet
Engineering Task Force) RFC 3261 (see http://www.ietf.org).

VCX V7122 VoIP SIP Supported Features

This section provides a high-level overview of some of the many VCX V7122 supported
features.

General Features

Superior, high quality PSTN gateway for Voice and Fax over IP calls.
Up to 16 E1/T1/J1 digital spans supporting various PRI and CAS protocols.
Compliant with SIP (RFC 3261).
Coders include: G.711, G.723.1, G.726, G.729A and NetCoder at 6.4 to 8.8 kbps,
negotiable per channel.
Echo Canceler with up to 128 msec tail length.
Silence suppression with Comfort Noise Generation.
Web management for easy configuration and installation.
Simple Network Management Protocol (SNMP) and Syslog support.
Simple Network Time Protocol (SNTP) support, the time-of-day can be obtained from a
standard SNTP server.

Hardware Features

Two 10/100 Base-TX Ethernet interface connections to the network, providing network
redundancy.
Compact, rugged 19-inch rack mount unit, one U high (1.75" or 44.5 mm), with two
compactPCI (cPCI) slots.
Optional cPCI slot for third-party CPU board.
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