Enterprise Media Gateways: Connecting UC to a PBX or the PSTN
Unified Communications (UC) is an important trend in converged TDM-IP enterprise communications for businesses that want to remain competitive. UC integrates disparate communication elements that employees use every day to deliver significant productivity gains. Among these elements are presence, instant messaging, voice, voice messaging, email, fax, conferencing, and web collaboration. These elements are accessed from a variety of endpoints, client softphones, hard phones, and mobile devices, and are combined in a convenient desktop interface as well as a separate mobile voice user interface, and may also be embedded in business applications. The goal of UC is to improve access and control over user communications, as well as to speed up the business process overall.
Media gateways can provide a standard interface and a bridge between IP-network-based UC solutions, such as the Microsoft® Lync Server and legacy PBX and PSTN networks. The illustration on this page provides an example of a converged UC environment.

Converged UC Environment
Enterprise Media Gateways, such as the Dialogic® Media Gateway (DMG Gateway) shown in the drawing on this page, smooth the transition to IP networks and IP-based applications like UC, while leveraging an organization’s investment in existing equipment, such as a PBX, by allowing it to continue to be used while employees with UC become more productive and efficient. Options such as direct PSTN or SIP trunk connectivity can also supplement or replace PBX public network connectivity.
Key Features of Dialogic® Media Gateways (DMG Gateways)
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Focus on CPE-based applications such as UC
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Provide 4 to 120 channels of VoIP and FoIP connectivity per gateway
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Enable “any-to-any” signaling: TDM-to-SIP, SIP-to-SIP, TDM-to-TDM
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Have been successfully tested for interoperability with leading legacy PBX switches
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Allow turnkey appliance ease-of-use and support for third-party SIP and FoIP applications
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Support up to V.34 fax transmission speeds over T.38 FoIP