Multitech Digital VOIP Gateway Service Manual

Digital Voice/Fax over IP Gateway

Multi-Tech’s digital MultiVOIP provides toll-free voice and fax communications

over the Internet or Intranet. By integrating voice and fax into your existing
data network, you can realize substantial savings on inter-office long
distance toll charges. The digital MultiVOIP family is available in 24/48-port
(T1/PRI) and 30/60-port (E1/PRI) models. Both models connect directly to
the PBX or digital carrier service to provide real-time, toll-quality voice
connections to any office on your VOIP network.

Features

 24/48-port (T1/PRI) or 30/60-port (E1/PRI) voice/fax ports for

communication over an existing IP network or the Internet

Benefits

Toll bypass voice/fax communications

PSTN voice quality

Connects directly to the PBX or digital

carrier service

Turnkey solution

Toll-free Digital
Voice/Fax
Communication over
the Internet or
Intranet

 10/100 Mb Ethernet connectivity and full IP compatibility with existing

routers and WAN infrastructure

 Connects directly to a PBX or PSTN line via T1/E1 or PRI

 Voice compression to 5.3K bps per call with support for multiple algorithms,

including ITU G.723 and G.729

 Single stage dialing eliminates user training

 Supports voice prioritization using the industry-standard Differentiated

Services (DiffServ) protocol

 Supports H.323 and SIP for sending voice over the Internet

 Dial, busy, fast busy and ringback tones

 Configuration and management using bundled SNMP management

software for central site logging and monitoring, live reporting, usage
tracking, call history, and voice quality statistics

 Supports H.450 supplementary services to provide for call transfer, call

forwarding, call hold, call waiting and name identification

 Two-year warranty

MultiVOIP

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Highlights

MultiVOIP Applications. MultiVOIP is ideal for

businesses looking to reduce toll charges between
frequently called sites. MultiVOIP is a voice over IP
gateway that integrates seamlessly into your data
network and operates alongside an existing PBX to
simply extend voice capabilities to remote locations. It
is designed to help maximize investments already made
in the data and voice network infrastructure.

SaveThousands of Dollars Each Month. MultiVOIP can

save substantial amounts in long distance charges. Even
if a company uses one of the most inexpensive calling
plans, a MultiVOIP network can quickly return the
investment and begin paying the company back.

Easy Integration. With MultiVOIP, you avoid the hassle

and expense of replacing your existing routers, WAN
connections or phone system required by other VOIP
solutions. MultiVOIP simply plugs into your Ethernet
network. Neither your phone service or network is
placed at risk. Minimum requirements: Ethernet
network, WAN connection, IP addresses.

Award-winning Voice Quality. With MultiVOIP, you’ll

experience consistent toll-quality voice connections.
Using the Perceptual Speech Quality Measurement
(PSQM), Internet Telephony magazine found that
MultiVOIP delivered exceptional voice quality. In fact,
MultiVOIP outranked the competition.

PSQM SCORES

The lower the better

Intolerable

Tolerable

Good

Exceptional

6.0

5.0

4.0

3.0

2.0

1.0

4.20Memotecs CX950

3.64Inter-Tels InterPrise400

2.50MultiVOIP

5.64Nueras Access Plus F50ip

4.21SOSs Sovereign

Interoperability. MultiVOIP utilizes the H.323 and SIP

protocols to provide complete interoperability with
other Internet telephony solutions. The inbound IP call
protocol is automatically detected and the voice
channel is dynamically configured to match. The
outbound IP call protocol is configured with the phone
number, allowing you the flexibility to call H.323 or SIP
devices from the same port.

Advanced Speech Technologies. MultiVOIP supports

the Differentiated Services (DiffServ) Quality of
Service (QoS) protocol which sets priorities for voice
and fax traffic and allows transparent delivery. DiffServ
helps move time-sensitive voice traffic across even
low-bandwidth WAN connections, like 56K DDS and
ISDN, with the priority and quality required by voice.
Other features such as adaptive echo cancellation,
forward error correction, bad frame interpolation,
tunable latency and dynamic jitter buffers, further
enhance voice quality.

Bandwidth Management. Bandwidth is used only when

someone is speaking. The silence suppression/Voice
Activity Detection (VAD) feature is an option that
frees unused call bandwidth for data traffic. This is
significant, since callers are usually silent for 60 percent
of the call. When using silence suppression, MultiVOIP
also offers Comfort Noise Generation (CNG) at the
receiving end so the user knows the line has not
dropped. In addition, MultiVOIP supports voice
compression standards like G.729 (8:1) and G.723 (10:1).
These standards help minimize the bandwidth required
for voice. G.723, for instance, is the maximum
compression rate and requires only 5.3K bps (plus
minimal IP overhead). Even at maximum compression,
your VOIP solution will still provide toll-quality voice.

No User Training. MultiVOIP provides single stage

dialing by utilizing a Uniform Dialing Plan that is
consistent with the E.164 (PSTN) standard numbering
plan. This includes automatic appending and stripping of
digits to dialed numbers to ensure that users will not
require additional training to make VOIP calls. In fact,
placing calls with MultiVOIP is like using your existing
phone system.

Management. MultiVOIP is easily managed locally using

a windows-based software application or remotely by
the central office with a web browser or SNMP. Multi­Tech also includes its own SNMP management
software called MultiVOIPManager which provides
central site configuration, management and call
monitoring for all MultiVOIP gateways on the network.
It utilizes a Windows interface that makes it easy to
view events like usage tracking, live use reporting, call
history, and voice quality statistics. In addition,
MultiVOIPManager eases administration by
automatically e-mailing call logs based on volume or
time.

An independent product review conducted by

Internet Telephony magazine (March 1999)