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Data Sheet
© 2009–2010 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 1 of 12
Cisco IP Communications Voice/Fax Network Module
Cisco IP Communications Voice/Fax Network Modules for the Cisco 2800, 2900, 3800, and 3900 Series
Unified Communications Routers
The Cisco® IP Communications voice/fax network modules provide enterprises, managed service providers, and
service providers the ability to directly connect the public switched telephone network (PSTN) and traditional
telephony equipment (private branch exchange [PBX], key system, analog telephones, fax machines, etc.) to Cisco
2800, 2900, 3800 and 3900 Series Unified Communications routers. This set of Cisco IP Communications voice/fax
network modules delivers the most versatile combination of analog and digital voice and data capabilities in a single
network module. As a completely integrated component of the Cisco Unified Communications solution including
Cisco Unified Communications Manager (UCM), Cisco IP phones, Cisco Unity
® unified messaging software, Cisco IP
Contact Center (IPCC), and the entire line of Cisco IP Communications products, the Cisco IP Communications
voice/fax network modules are a cornerstone of Cisco Unified Communications. When used in a Cisco unified
communications router with Cisco UCM, Cisco Unified Survivable Remote Site Telephony (SRST), or Cisco UCM
Express, the Cisco IP Communications voice/fax network module is a complete IP Communications solution for the
business branch.
Figure 1 shows the IP Communications voice/fax network module with one VWIC2-2MFT-T1/E1 and one VIC3-
4FXS/DID.
Figure 1. NM-HD-2VE with One VWIC2-2MFT and One VIC3-4FXS/DID
The Cisco IP Communications voice/fax network modules for the Cisco 2800, 2900, 3800, and 3900 Series unified
communications routers enable packet voice technologies including VoIP (H.323, Media Gateway Control Protocol
[MGCP], and Session Initiation Protocol [SIP]). Cisco Unified Communications solutions provide the means for
integrating voice and data within a single network, allowing users to take advantage of services such as IP
telephony, integrated services, and toll-bypass while providing an opportunity to improve productivity. By operating
on Cisco IOS Software, these solutions incorporate advanced quality-of-service (QoS) features, intelligent network
queuing, and standards-based encapsulation, providing efficient direct transport of both voice and fax over IP
networks. Cisco IOS Software solutions enable time-sensitive voice traffic to be moved across even low-bandwidth
WAN connections with the priority and quality that voice and fax demand. Transporting voice over IP networks
continues to provide transport flexibility because IP can be routed across a multitude of WAN technologies (leased
lines, Frame Relay, and ATM) along with providing direct connectivity to the desktop.
Data Sheet
© 2009–2010 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 2 of 12
Figure 2 shows an IP telephony application using Cisco UCM Express and SRST in a business branch.
Figure 2. IP Telephony Application Using Cisco UCM Express and SRST in the Business Branch
The 2900 Series and 3900 Series Integrated Services Routers support Network Modules via an adapter (part
number SM-NM-ADPTR).
The Cisco IP Communications voice/fax network modules support either one or two Cisco voice interface cards
(VICs) or Cisco voice/WAN interface cards (VWICs) and install into network module slots for the Cisco 2800, 2900,
3800, and 3900 series unified communications routers. The Cisco VICs are daughter cards that install into the
network modules and provide the interface to the PSTN and to telephony equipment (PBX, key systems, fax
machines, phones). The Cisco VWICs are daughter cards that provide the interface to the PBX, PSTN, and/or WAN.
VICs include 2-port foreign exchange station (FXS), direct inward dial (DID), foreign exchange office (FXO), and
E&M analog interface cards. Also available are 4-port FXS and 4-port FXO cards and a 2-port ISDN Basic Rate
Interface (BRI) digital interface card providing –40V phantom power. These cards cover the entire range of analog
connectivity options along with user-side and network-side digital BRI connections (Table 1). Cisco VWICs include 1-
and 2-port T1 and E1 interface cards with optional drop-and-insert capability. These cards cover a full range of digital
voice and WAN connectivity options and provide connectivity to the world’s PBXs, PSTNs, and Post, Telephone, and
Telegraph (PTT) organizations.
Cisco IP Communications voice/fax network modules provide the gateway to Cisco Unified Communications for calls
to and from the PSTN and the traditional telephony equipment. Users can deploy networks that take advantage of
investments in existing telephony equipment while also deploying and integrating IP telephony immediately or in the
future. These network modules enable users to operate at any point on the integrated voice, video, and data
infrastructure spectrum while incrementally adding connections to both traditional telephony and IP telephony.
Data Sheet
© 2009–2010 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 3 of 12
Table 1. Cisco Voice/WAN Interface Cards
The 2900 Series and 3900 Series Integrated Services Routers support Network Modules via an adapter (part number SM-NM-ADPTR).
Part Number Description Application
NM-HD-1V 1-slot IP communications voice/fax network
module.
Supports up to four channels of analog/BRI voice using any supported coder-
decoder (codec). (No support for T1/E1 or data WAN.)
NM-HD-2V 2-slot IP communications voice/fax network
module.
Supports up to eight channels of analog/BRI voice using medium complexity
codec or six channels using any supported codec. (No support for T1/E1 or
data WAN)
NM-HD-2VE 2-slot IP communications enhanced
voice/fax network module.
Supports analog/BRI/T1/E1 voice and data WAN. Supports up to 48
channels of G.711 codec, 24 channels of medium-complexity codec, or 18
channels of any supported codec. Offers maximum investment protection
with support for analog/digital voice and data WAN.
VIC3-2FXS/DID 2-port FXS/DID voice/fax interface card.
FXS port is used to connect directly to phones, fax machines, and key
systems. Generates battery polarity reversal and caller ID.
DID port is used to provide off-premises DID connection from central office.
Serves only incoming calls from the PSTN. Does not support caller ID in DID
mode.
VIC3-2FXS-E/DID 2-port Enhanced FXS/DID voice/fax interface
card.
FXS port is used to connect directly to phones, fax machines, and key
systems. Generates battery polarity reversal and caller ID. VIC3-2FXS-
E/DID is designated as an “Off-Premise Extension Lite” product offering.
This means that while the module addresses a subset of the off-premise
extension applications, it should be noted that the module is not in full
compliance for off-premise usage.
DID port is used to provide off-premises DID connection from central office.
Serves only incoming calls from the PSTN. Does not support caller ID in DID
mode.
VIC3-4FXS/DID 4-port FXS/DID voice/fax interface card
FXS port is used to connect directly to phones, fax machines, and key
systems. Generates battery polarity reversal and caller ID.
DID port is used to provide off-premises DID connection from central office.
Serves only incoming calls from the PSTN. Does not support caller ID in DID
mode.
VIC2-2FXO
2-port FXO voice/fax interface card
[universal card for all countries]. Also
supports analog Centralized Automated
Message Accounting (CAMA) on any port.
FXO port is used to connect to PBX or key system, or to provide off-premises
connections to PSTN or PTT. Supports battery reversal detection and caller
ID. These Cisco VICs can be software configured to work in all countries.
Also used to connect to analog CAMA trunk to provide dedicated E-911
service (North America only)
VIC2-4FXO
4-port FXO voice/fax interface card
[universal card for all countries]. Also
supports analog CAMA on any port.
FXO port is used to connect to PBX or key system, or to provide off-premises
connections to PSTN or PTT. Supports battery reversal detection and caller
ID. These Cisco VICs can be software configured to work in all countries.
Also used to connect to analog CAMA trunk to provide dedicated E-911
service (North America only)
VIC3-2E/M 2-port E&M voice/fax interface card. Used to connect to PBX or key system as tie lines.
VIC2-2BRI-NT/TE
2-port BRI voice/fax interface card
(configurable for either network or terminal
side).
Used to connect as network side or user side to PBX or key system as
off-premises connections (ISDN voice BRI). Supports patent-pending flexible
Layer 2 and Layer 3 configurations.
VWIC2-1MFT-T1/E1 1-Port T1/E1 Multiflex Trunk Voice/WAN
Interface Card
Used to connect to PBX, PSTN, or WAN using T1/E1 standard interface and
provide channel drop-and-insert capability.
VWIC2-2MFT-T1/E1 2-Port T1/E1 Multiflex Trunk Voice/WAN
Interface Card
Used to connect to PBX, PSTN, or WAN using T1/E1 standard interface and
provide channel drop-and-insert capability.
VWIC2-1MFT-G703 1-Port G.703 Multiflex Trunk Voice/WAN
Interface Card
Used to support unstructured E1 (G.703) and all features of the other Cisco
MFT VWIC2 modules, including drop-and-insert.
VWIC2-2MFT-G703 2-Port G.703 Multiflex Trunk Voice/WAN
Interface Card
Used to support unstructured E1 (G.703) and all features of the other Cisco
MFT VWIC2 modules, including drop-and-insert. Additional flexibility is
provided on the two port module with the capability to configure one port for
unstructured E1 (G.703) while configuring the other for standard framed E1.
Table 2 shows the maximum number of Cisco IP Communications voice/fax network modules allowed per Cisco
platform.

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