Dialogic® 4000 Media Gateway Series (DMG4000 Gateways)

DMG4000 Media Gateway

DMG4000 Gateways are integrated systems that perform the Survivable Branch Appliance function.

The Dialogic® 4000 Media Gateways (DMG4000 Gateways) are integrated systems that can provide both local PSTN and voice endpoint connectivity at a branch office premise as well as base-level voice service continuity in the event that the corporate WAN becomes unavailable.

2009 Unified Communications Product of the Year logo

The DMG4000 Gateways are standard rack-mount servers running the Windows Server® 2008 R2 operating system. They support the Survivable Branch Appliance function that is part of the Microsoft® Lync™ Server 2010 for unified communications. The Survivable Branch Appliance function allows branch offices to work effectively even if the WAN connection to the central site is lost. The ability to make voice calls, use email, and hold audio conferences continues to be available.

The Dialogic® 4000 Media Gateways contain field-proven Dialogic® Diva® boards in addition to the Lync Server with its Survivable Branch Appliance function. These elements are integrated in a rugged 1U rack-mount server featuring a high-performance 64-bit Intel Xeon processor.

The DMG4000 Gateways also offer dual Gigabit Ethernet interfaces for IP network connection, as well as a variety options for interfacing to the PSTN or PBXs, including Analog, ISDN BRI, and E1/T1. In addition, the DMG4000 Gateways can be configured to support up to 120 channels of unified communications traffic.


Supports the Survivable Branch Appliance function of the Lync Server

Provides branch office resiliency by maintaining branch user functionality and productivity during WAN outages

Available as a 1U rack mount integrated system supporting
configurations of 48/60 channels (T1/E1) or 96/120 channels

Offers a range of product densities for businesses of various sizes

Redundant power supply, RAID 1 hard disk subsystem, and a failover and load balancing Ethernet network connection 

Delivered with features that enable high availability

Enhanced gateway functionality

Allows for a common architecture, platform, and management interface for central site and branch deployments

Supports T.30 Fax Group 3 up to 33.6 kbps (depending on
installed license) using T.38 real-time FoIP

Offers a range of fax configurations to address demands
regarding fax channel density and fax transmission speed


Technical Specifications

Ports per unit

DMG4008LSW Media Gateway: 8-port Analog (8 channels)
DMG4008BRI Media Gateway: 4-port ISDN BRI (8 channels)
DMG4030DTI Media Gateway: 1-port T1/E1 (24/30 channels)
DMG4060DTI Media Gateway: 2-port T1/E1 (48/60 channels)
DMG4120DTI Media Gateway: 4-port T1/E1 (96/120 channels)

Network interface

2 x 10/100/1000 BaseT Ethernet LAN port with load balancing

Protocol support

E1 ISDN: ETSI-DSS1 (EuroISDN), INS-1500 (Japan), QSIG

VoIP call control Session Initiation Protocol (SIP), RFC 3261
Configurable transport layer for SIP, UDP, and TCP
Session Description Protocol (SDP), RFC 2327
Basic call with far-end and near-end disconnect
Microsoft® SIP extensions, compatible with both Microsoft® Exchange UM and
Microsoft® Office Communications Server 2007 R2
Supplementary services

Numbering services (abstracted as Called Party Number, Calling Party Number/CLIP,
and Redirecting Number)
Call hold/retrieve
Call diversion
Unattended, blind transfer
Attended transfer with consultation call
Message waiting activation/deactivation

FoIP services
(depending on installed Fax license)
Default: 12 channel of V.17 fax (14.4 kbps)
Optional: Up to 120 channel of V.34 fax (33.6 kbps)
T.30 Fax Group 3 up to 33.6 kbps using T.38 real-time FoIP
Fax compression MH, MR, MMR
Error Correction Mode (ECM)
Clear Channel Fax
Tone processing features DTMF generation and recognition (in-band)
DTMF relay, RFC 2833
Media streaming IP Real-time Transport Protocol (RTP)
RTP dynamic payload audio/telephony event
RTP profile name RTP/AVP
TDM-side fax tone detection via RTP event (RFC 2833)
Echo canceller with up to 256 ms echo tail
G.711 coder, 64 kbps (64 kbps, A-law, μ-law)

Physical Dimensions

1U, 19 inch rack mount server

Power supply 90 VAC to 264 VAC
450 W
Power Factor Corrected (EN61000-3-2)
Two (2) redundant power supplies included

Mediation Server

Globally Routable User Agents URI
SIP over mutual TLS
SRTP on Communications Server
RT Audio on Communications Server
Interactive Connectivity Establishment (ICE) support


Data Sheet

  • The Dialogic ® 4000 Media Gateway Series (DMG4000 Gateways) is a set of integrated systems designed to connect Microsoft ® Office Communications Server 2007 to existing PBX systems and PSTN networks. Based on a standard rack-mount server running the Windows® Server operating system, the DMG4000 Gateways are “hybrid gateways” designed for the Office Communications Server 2007 role of Mediation Server, which is Microsoft’s technology providing PSTN and PBX interoperability, high-fidelity VoIP, and security.

Application Notes


  • The transformation from traditional communications to VoIP is well underway, but there is still a large installed base of PSTN equipment across service provider and enterprise networks. Gateways can smooth the transition to IP networks and bridge the gap between legacy and next generation technology requirements. Find out how Dialogic’s modern media gateways enable service providers to deliver innovative voice and video solutions, while allowing them to leverage their sizeable investments in existing communications infrastructure.

Case Study

Technology Brief

White Paper

  • Although many enterprises are eager to deploy converged voice and data applications and services over IP, they see their legacy PBX systems and upfront costs as roadblocks to the enhanced capabilities that IP would bring. This paper demonstrates that legacy PBX equipment does not have to be replaced for enterprises to begin a phased migration to IP convergence. Dialogic® media gateway appliances make the implementation of IP technology in PBX systems possible right now, and with low upfront investment costs.
  • Successful Voice over IP (VoIP) deployments can deliver solutions that provide voice quality that is comparable to traditional circuit-switched telephone networks, but at a lower cost. Builds on the background information provided in Overcoming Barriers to High-Quality Voice over IP Deployments.
  • This white paper provides an overview of some of the XML communication technologies that address new customer expectations for a more media-centric, information-rich caller experience, and briefly discusses Dialogic® products that leverage XML technology.
  • This white paper briefly describes the T.30 and T.38 protocols and compares traditional fax technology with Fax over IP (FoIP).
  • This white paper provides guidance for estimating the number of trunk channels that must be supported through VoIP gateways to handle PSTN calls in a unified communications deployment.
  • This white paper focuses on how an enterprise with SIP trunking can use wideband audio for internal communications, communications with other enterprises, and communications with mobile users to create a better user experience.

Use the Purchase page linked below to find partners to purchase Dialogic products. The order codes below are for your reference when making a purchase.

Where to Buy

ProductOrder CodeDescription
DMG4008BRI-R2306-4444 port BRI (8 channels)
DMG4030DTI-R2 306-445 1-port T1/E1 (24/30 channels+V.34 Fax/FoIP)
DMG4060DTI-R2306-4462-port T1/E1 (48/60 channels)
DMG4060DTIV34-R2306-4472-port T1/E1 (48/60 channels+V.34 Fax/FoIP)
DMG4120DTI-R2306-4484-port T1/E1 (96/120 channels)
DMG4120DTIV34-R2306-4494-port T1/E1 (96/120 channels+V.34 Fax/FoIP)
DMG4008LSSBA306-4358-port analog loop start with Survivable Branch Appliance capabilities
DMG4008BRISBA306-4364 port BRI (8 channels) with Survivable Branch Appliance capabilities
DMG4030DTISBA 306-437 1-port T1/E1 (24/30 channels+V.34 Fax/FoIP) with Survivable Branch Appliance capabilities
DMG4060DTISBA306-4382-port T1/E1 (48/60 channels) with Survivable Branch Appliance capabilities
DMG4060DTIV34SBA306-4392-port T1/E1 (48/60 channels+V.34 Fax/FoIP) with Survivable Branch Appliance capabilities
DMG4120DTISBA306-4404-port T1/E1 (96/120 channels) with Survivable Branch Appliance capabilities
DMG4120DTIV34SBA306-4414-port T1/E1 (96/120 channels+V.34 Fax/FoIP) with Survivable Branch Appliance capabilities
DMG4000SU3UPGRADE306-408SU3 Field Upgrade Kit (Software Pack on USB Drive)
DMG4000SU4UPGRADE306-429survivable branch appliance upgrade including operating system license
DMG4000SU4UPGRADENOLICENSE306-430survivable branch appliance upgrade with no operating system license