InterPrise 3200D
™
An IP Telephony Gateway for
Enterprise Network Applications
InterPrise 3200D March 2002
Table of Contents
Overview.........................................................................................................3
Ease of Integration................................................................................................................................... 3
Quality Voice Communication................................................................................................................3
Web-based Calling with ClearConnect – Talk to Agent ..................................................................... 3
The Voice of the Internet.........................................................................................................................3
Applications ....................................................................................................4
Connecting Phone Systems Together Over the WAN........................................................................ 4
Connecting Web Surfers to a PBX Telephone with Talk to Agent....................................................4
Specifications..................................................................................................5
Voice and Call Capabilities.....................................................................................................................5
Fax Capabilities........................................................................................................................................5
Protocol Support.......................................................................................................................................5
Physical Interfaces...................................................................................................................................5
Telephony Interface for T1......................................................................................................................5
Telephony Interface for E1 .....................................................................................................................6
Routing....................................................................................................................................................... 6
Management and Control .......................................................................................................................6
Additional Compatibilities........................................................................................................................6
Power Supply Requirements.................................................................................................................. 6
Physical Dimensions................................................................................................................................6
Main Control Unit Rear Panel.................................................................................................................7
Network Provisioning .....................................................................................7
Routers ......................................................................................................................................................7
Firewalls.....................................................................................................................................................7
Proxy Servers ........................................................................................................................................... 7
Bandwidth Requirements........................................................................................................................8
Regulatory Approval.......................................................................................8
InterPrise 3200D March 2002
Overview
Delivering integrated voice and data communications throughout your organization has never
been easier or more cost-effective. Today, you can bring office locations worldwide closer
together by relying on Internet Protocol (IP)-based networks to deliver both voice and data
communications across the Internet or a private intranet. Inter-Tel’s InterPrise 3200D IP
telephony gateway can make it happen. By accepting voice transmission from any standard PBX
or key system and converting it into data packets, the InterPrise 3200D transmits real-time voice
alongside your organization's e-mail or fax communications. One network for voice and data
means lower costs and greater efficiency throughout your enterprise.
As a result, you'll be able to eliminate costly intra-company long distance telephone toll charges.
Instead, you'll pay a single flat rate for both voice and data communications between facilities. In
addition to cost savings, you'll make it easier for employees and customers alike to get the
information or assistance they need, regardless of geographic location.
Ease of Integration
Regardless of how you choose to take advantage of IP telephony, the InterPrise 3200D makes it
easy to implement and as easy-to-use as your office phone or fax machine. You can use your
existing telephone to place calls across your Wide Area Network (WAN) just like you would any
other call. You can even send intra-office faxes across your data network with the InterPrise
3200D.
By delivering both voice and data network connectivity in an 8, 16, 24 or 30-port configuration, the
InterPrise 3200D delivers reliable, high-quality voice and data communications to small branch
offices as well as main corporate facilities.
Quality Voice Communication
The InterPrise 3200D delivers full duplex, toll-quality voice conversations by relying on superior
voice encoding technology and advanced features like echo cancellation. This ensures that the
delay or loss of voice packets, and the effects of that loss, are minimized so that voice
conversations are free from background noise, delay and "clipping."
In addition to ensuring voice quality, the InterPrise 3200D delivers voice communications
efficiently by compressing voice from 64 kilobits per second (kbps) to as low as 8 Kbps per voice
channel. This dramatic decrease in bandwidth usage means you can deliver as much as eight
times the amount of voice communications across your data network as you could with an
uncompressed voice transmission. Less bandwidth for voice means more for data, ensuring that
both will flow reliably across your network to their final destination.
Web-based Calling with ClearConnect – Talk to Agent
Capturing the sale and improving customer support over the Internet has never been easier than
now. With ClearConnect – Talk to Agent, you can voice-enable your Web site and allow webbased customers to talk to your call center agents with a click of a button. Talk to Agent is an
application that “plugs” into the customer’s Web browser. When the “touch to talk” link on your
Web site is clicked on, the Web browser becomes voice-enabled and a call is then established
between the customer and your support agents. Whether you wish to increase your online sales
or simply improve your level of customer support, Talk to Agent puts your customers a click away
from a live representative of your company.
The Voice of the Internet
Whether you've already implemented a Wide Area Network, or are looking for ways to increase
the return on investment for a new network project, Inter-Tel offers the right technology, in a
InterPrise 3200D March 2002
package that's easy to implement and easy to afford. For more information, contact your Inter-Tel
representative.
Applications
Following are a set of example applications using the InterPrise 3200D. These drawings make
the assumption that the WAN is already in place. Therefore, the InterPrise gateway is located
behind the existing router. In some cases, when the WAN is not in place, the InterPrise 3200D
can be installed as the router.
Connecting Phone Systems Together Over the WAN
PBX 1
INTER-TEL
PBX 2
INTER-TEL
Los
Angeles
InterPrise 3200D
Router
WAN
Internet
LAN
Router
InterPrise 3200D
Connecting Web Surfers to a PBX Telephone with Talk to Agent
PBX
Multimedia
Computer
Web Server
Internet
Router
InterPrise 3200D
INTER-TEL
New
York
InterPrise 3200D March 2002
Specifications
Voice and Call Capabilities
• T1 available in 8-channel, 16-channel, and 24-channel configurations
• T1 PRI available in 7-channel, 15-channel, and 23-channel configurations
• E1 available in 8-channel, 16-channel, 24-channel, and 30-channel configurations
• E1 PRI (ISDN) available in 7-channel, 15-channel, 23-channel, and 30-channel
configurations
• G.711 (ITU 64 Kbps PCM A-Law/µ-Law Standard)
• G.726 (ITU 40, 32, 24 Kbps) ADPCM
• G.728 (ITU 16 Kbps LD-CELP)
• G.729 (ITU 8 Kbps CS-ACELP)
• A-Law to µ-Law PCM code conversion
• G.165 (ITU echo cancellation Standard)
• Transparent DTMF/MF Processing
• Supports MF to DTMF conversion
• Call Progress Tone Handling
• Call Routing and Number Translation
• Local unit loop back calling
• Auto ring-down
• Automated Speech, Fax and In-Band Data Discriminator
• Digital Speech Interpolation (DSI) and Voice Activity Detection
• Voice over Frame Relay
• Voice over IP/Internet
• Voice over Data Routing Prioritization
• Data fragmentation
• Low Latency
• Adaptive Jitter Buffer Management
• Call Aggregation
Fax Capabilities
• Group III Fax Relay T.30 (demodulation and re-modulation up to 9600 baud)
Protocol Support
• Ipv4 Host and Routing (RIP v1, static routes)
• Frame Relay
• Q.922 HDLC
• RFC1490 Encapsulation
• LMI ANSI T.167 Annex D
• Frame Relay Encapsulated IP
• Simple Network Management Protocol (SNMP)
Physical Interfaces
• (2) V.35: Synchronous Data up to 2.048 Mbps
• RS-232 Console Port
• T1 or E1
• Ethernet 10Base-T IEEE 802.3
Telephony Interface for T1
• Circuit Type: T1 E&M (two-way, wink-start)
• Framing Type: D4 Superframe or Extended Superframe (ESF)
InterPrise 3200D March 2002
• Zero code suppression scheme: AMI (Alternate Mark Inversion), AMI ZCS (Alternate
Mark Inversion Zero Code Suppression; also known as bit-7 stuffing or jam bit 7), or
B8ZS (Bipolar Eight Zero Substitution)
• Line build-out (LBO) attenuation: For example, 0dB, 7.5dB, 15dB, or 22.5dB depends on
the telephone system and how close it is to the 3200D; set according to the
manufacturer’s recommendation)
• Reference clock programming: Private Network Master (the InterPrise 3200D acts as a
slave)
Telephony Interface for E1
• Circuit type: E1 PRI (ISDN), E1 MFC-R2, or E1 E&M Immediate
• Zero code suppression scheme: HDB3 (High-Density Bipolar-3 zeros) or AMI (Alternate
Mark Inversion)
• Reference clock programming: Private Network Master (the InterPrise 3200D acts as a
slave)
Routing
• Voice over data prioritization
• IP Precedence bit for QoS
• Data Fragmentation for QoS
• Frame Relay termination
• IP protocol routing at 720 packets per second
Management and Control
• Comprehensive on-line help, configuration, control, traffic monitoring, alarm and status
recording, software download/upload
• Configurable with both IP, console port, and modem access
• In-Band Host to Host Management and Control
• SNMP Management
• Centralized call routing and CDR generation through optional Connectivity Manager
software
Additional Compatibilities
• Server real-time billing support via ODBC-compliant DBMS
• CDR generation
• Connectivity Manager support
• ClearConnect SoftPhone client
• ClearConnect – Talk to Agent web-based client
Power Supply Requirements
• Operating Voltage: 115V/230V AC with 0.6A/0.25A, 47–63 Hz
• Peak Power Consumption: 60 Watts
Physical Dimensions
• Chassis: All aluminum construction
• Handles: Extruded, formed aluminum
• Sliding Rail Options: 457 - 762 mm (18 - 30 in.)
• Weight: 14 kg. (30 lbs.)
• Width: 483 mm. (19 in.)
• Height: 177 mm. (7 in.)
• Depth: 432 mm. (17 in.)
InterPrise 3200D March 2002
Main Control Unit Rear Panel
Network Provisioning
Routers
When a Voice over IP (VoIP) device communicates through a router, it is highly recommended
that the router be able to prioritize the packets. Since the voice packets have to reach the
destination in “real time” it is important for the router to pass the voice packets through before any
other data. In some configurations, a dedicated serial or Ethernet port is available on the router
for the VoIP traffic. In this case, the router needs to prioritize the traffic from that physical
interface over all other interfaces.
If the VoIP device is talking to the router through the same physical Ethernet interface as the LAN
traffic, then you need to prioritize the VoIP traffic by TCP and UDP port numbers. When installing
or configuring the router(s) used to pass the VoIP traffic, here are the port numbers you should
prioritize:
UDP port 16384 (audio)
UDP ports 5000-5018 (call control)
Firewalls
If your firewall is using a fully qualified set of IP addresses, then you simply need to open up the
ports listed above to allow the inbound voice traffic through. If you are using NAT, then you need
to be able to “map” or “bind” the above ports to the IP address of the InterPrise 3200D.
Proxy Servers
If you intend to pass Voice over IP traffic through a Proxy server, the server needs to be capable
of providing proxy services for any IP device, not just Windows PCs. Some proxy servers require
a client-side application on any IP-based unit that needs access through the firewall. InterPrise
3200D is not a Windows PC, as many proxies require. Therefore, an alternate path for the Voice
over IP traffic may need to be established.
InterPrise 3200D March 2002
Bandwidth Requirements
The bandwidth required for IP calls is determined by three factors. The first factor is the vocoder
selection. The most popular vocoder is G.729 with a compression ratio of 8:1. This vocoder
takes a traditional 64 kbps call and compresses it to 8 kbps. The second factor is a custom
feature called Frame Multiplier. This user-definable feature adjusts the number of voice samples
that get placed inside a single network packet. The third factor is the total number of InterPrise
gateways communicating together on the network. This is due to another custom feature called
Call Aggregation. Simply put, this allows IP calls destined to the same place to share the network
protocol overhead. This allows the overhead to be distributed over multiple calls, thus reducing
the required bandwidth per call.
The three factors all affect the amount of bandwidth required for the voice traffic. Although the
average total rate per call is around 12-14 kbps (using G.729), certain configurations can require
as much as 18 kbps and as little as 8.5 kbps when using the G.729 vocoder. The values can be
predicted using the formulas provided in the installation manual. Until the actual layout of a
network is known, it is impossible to know exactly what the required bandwidth will be. However,
once the layout is known, precise calculations can be generated and used in designing even the
most rigid of networks.
Regulatory Approval
• Approved for direct PSTN or PBX connectivity in the following countries:
o United States o Canada o Austria o Belgium o Denmark o Finland o France o Germany o Greece o Holland o Iceland o Ireland o Italy o Luxembourg o Norway o Portugal o Spain o Sweden o Switzerland o UK
• The 100-ohm T1 Line Interface Card (LIC) for this system complies with Part 68 of the U.S.
Federal Communications Commission (FCC) rules (FCC registration number: BE2USA-27119--CN--N).
• The 120-ohm E1 Line Interface Card (LIC) complies with the pan-European requirement CTR
4 and is approved by NMi (Notified Body # 0122).
Some features or applications mentioned may require a fut ure releas e and are not available in the initial release. Future product
features and applications are subject to availability and cost. Specifications are subject to change without notice. Some features
may require additional hardware and/or special software.
©Copyright 2000 Inter-Tel Incorporated
InterPrise 3200D March 2002
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