What is VoIP? Voice-over-Internet-Protocol is a packet-based technology for transmitting digitized voice over an Ethernet/IP network. Because many businesses deliver the packetized voice traffic across the Internet to lower the phone bill, VoIP is sometimes called Internet Telephony. VoIP technology, or packet-based voice, underlies such recent developments as unified communication (UC). Related terms include network transformation-referring to carriers that migrate to All-IP network service delivery-as well as real-time communication, since voice transmission is especially sensitive to network issues as delay and jitter (variance in delay).

A VoIP gateway-a.k.a. analog telephone adapter (ATA)-is a networking device that converts a traditional (legacy) phone signal (analog or digital) into a (digitized) packet-based, Internet Protocol (IP) communication stream. The gateway serves as the conversion point between Time Division Multiplexed (TDM) telephone network and an IP-based network such as the Internet or private corporate LAN or WAN.

Traditional business-class telephony services include include PRI, E1 and T1 trunks, plain old telephone service (POTS) interfaces like FXS and FXO (learn more about FXS/FXO technology) as well as BRI and PRI interfaces for integrated services digital network (ISDN). (Glossary of telecom terms.) The gateway converts voice received from the PBX into IP packets suitable for transmission over a data network. Similarly, the gateway re-formats the stream of incoming IP data packets for use by the PBX system.

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Show Me: VoIP Gateways

T1/E1/PRI ISDN VoIP Gateway

SmartNode 4170
Transport your enterprise phone system to the world of IP Telephony with the SN4170 T1/E1/PRI Gateway. Supports up to 30 concurrent G.711/ G.722 voice/fax calls with secure HTTPS, stateful firewall, and TLS/SRTP.

Analog VoIP Gateway with 2-8 FXS/FXO ports

SmartNode 4110
The SmartNode 4110 Analog VoIP Gateway supports up to eight FXS or FXO telephone connections. Connect PSTN Lines, PBXs, and standard phones for voice and fax over any IP network. Now the corporate, small, or remote office can access Internet telephony services, eliminate toll charges and route calls to and from the PSTN, Internet, or LAN.

SS7 TDM+VoIP Gateway with T1/E1/J1

SmartNode 10100
The carrier-grade SmartNode 10100 VoIP gateway supports 128 to 256 calls. Smaller service providers can use this SS7 gateway to drive convergence between TDM and IP networks. The SN10100 carrier gateway replaces multiple devices for signaling, connectivity, and media transcoding.

ISDN VoIP Gateway with 2�4 BRI S0 ports

SmartNode 4130
With up to 4 BRI ports and 8 simultaneous G.711 voice channels, the SN4130 is the best way to connect ISDN networks or ISDN terminal equipment to the world of voice over IP. It supports up to 5 G.711 or up to 8 G.722 voice/fax calls concurrently with secure HTTPS, stateful firewall, and TLS/SRTP.

Teach Me: What is a VoIP Gateway?

VoIP Gateways can support numerous use cases (application scenarios) to enable IP telephony implementations. A media gateway may provide several types of bi-directional conversion, including SIP-to-TDM and TDM-to-SIP. Some high-end Voip Gateways may even provide such session border controller (SBC) functions as transcoding, security firewall, failover, and others.

Typical VoIP Gateway Applications
VoIP media gateways can be used to address many different challenges when implementing an IP-based voice system. Three of the most common use cases are summarized below.

Legacy TDM-to-IP/SIP
PSTN (T1/E1/PRI) to All-IP Voice System
The primary driver for TDM-to-SIP deployment is known as "toll bypass" which reduces a company's operating costs by avoiding the expensive tolls levied by a public switched telephone network (PSTN). Instead of a Telco trunk, the VoIP gateway connects a legacy business phone system to a much lower-cost SIP trunk, delivered by an Internet telephony service provider (ITSP).

VoIP Provider to Legacy PBX
ITSP or cloud/hosted/virtualized SIP trunking service to Analog POTS or Digital ISDN PBX.
A VoIP gateway can connect a state-of-the-art All-IP communications system (on-premise IP PBX or cloud/hosted/virtualized IP PBX) to a legacy PTSN trunk. You can upgrade a legacy business phone system using an IP media gateway so it can connect to an ITSP over a SIP trunk. SIP trunks are much less costly than expensive toll-based legacy T1 lines.

Migration from Legacy to IP PBX
Going the other way round, in a SIP-to-TDM deployment, the gateway connects a modern SIP communications system with a T1/E1/PRI service provided by a legacy carrier. Keep the existing business phone system up-and-running while transitioning to a new IP based phone system.

VoIP Gateway Terminology
Short Glossary of Related Acronyms
VoIP - Voice over IP
SIP - Session Initiation Protocol
IP - Internet Protocol
TDM - Time Division Multiplexing
PRI - Primary Rate Interface
ISDN - Integrated Services Digital Network
PSTN - Public Switched Telephone Network
ITSP - Internet Telephony Service Provider
FXS - Foreign eXchange Subscriber interface
FXO - Foreign eXchange Office interface

Common VoIP Gateway Synonyms
IP Media gateway
SIP gateway
Voice gateway
TDM gateway
PSTN gateway
PRI gateway
ISDN gateway
Digital Telephony gateway
FXO Gateway
FXS Gateway
Enterprise Gateway
SME Gateway
Digital Telephony Gateway
Analog Telephone Adapter (ATA)

Help Me: VoIP Gateway Technical Help

Patton offers an extensive online library of technical information to help you get your SmartNode VoIP gateway up and running in a jiffy. Patton's web-based FAQs, configuration notes, and application notes provide the detailed knowledge you need to install, configure, troubleshoot and maintain your Patton VoIP gateway. And these helpful resources are all free right here on patton.com. Patton stands behind our high-quality VoIP Gateway products-world-renowned for set-it-forget-it reliability and stability-with live email and phone support plus lifetime downloadable software updates absolutely free of charge.

Analog VoIP Gateways

SmartNode, M-ATA
Micro Analog Telephone Adapter

SmartNode, SN100
Analog ATA/Router | 1 or 2-Analog Ports

SmartNode, SN2290
Analog-over-IP Leased Line Extender | 2 or 4 lines

SmartNode, SN4110
Analog VoIP Gateway | 2, 4, 6 or 8 ports for up to 8 phone or fax calls

SmartNode, SN4140
Analog VoIP Gateway | 2, 4 or 8 analog ports for up to 8 phone or fax calls

SmartNode, SN4140E
Industrial & Military-Grade Rugged VoIP Gateway | 2, 4 or 8 Analog Ports

SmartNode, SN4150
Analog & BRI VoIP Gateway | 2 BRI/2 FXS-FXO or 4 BRI/4 FXS-FXO ports for up to 8 phone or fax calls

SmartNode, SN4300
IpChannelBank Analog VoIP Gateway | 16, 24 or 32 FXS or FXO ports

BRI VoIP Gateways

SmartNode, SN4120
Single/Dual-BRI ISDN VoIP Gateway | 2 or 4 calls

SmartNode, SN4130
BRI VoIP Gateway | 2, 4 or 8 S0 ISDN ports for up to 16 simultaneous phone or fax calls

SmartNode, SN4150
Analog & BRI VoIP Gateway | 2 BRI/2 FXS-FXO or 4 BRI/4 FXS-FXO ports for up to 8 phone or fax calls

SmartNode, SN-DTA
ISDN Digital Terminal Adapter

SS7 Gateways

SmartNode, SN10100
4 to 16 x T1/E1/J1 Media Gateway

SmartNode, SN10200
16 to 64 x T1/E1/J1, 1 to 3 DS3, or 1 OC3/STM-1 Edge Media Gateway

SmartNode, SN10300
16 to 1024 x T1/E1/J1, 1 to 48 DS3, or 1 to 16 OC3/STM-1 Edge/Core Media Gateway

T1/E1/PRI VoIP Gateways

SmartNode, SN10100
4 to 16 x T1/E1/J1 Media Gateway

SmartNode, SN4170
PRI VoIP Gateway | One T1/E1/PRI interface for up to 30 simultaneous phone or fax calls

SmartNode, SN4970A
PRI VoIP Gateway | 1 or 4 T1/E1/PRI interface for up to 120 simultaneous phone or fax calls

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