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Home Enterprise

Telephone System Integration with UM

Paul Balo by Paul Balo
July 10, 2014
in Enterprise, Telecom
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To successfully deploy Unified Messaging (UM), you must have a good understanding of basic telephony concepts and telephony components. After you understand telephony basics, you can integrate UM into an Exchange organization. Basic concepts and components include the following:
Circuit-switched and packet-switched networks
Private Branch eXchange (PBX)
IP PBX
Voice over Internet Protocol (VoIP)
VoIP gateways
In an on-premises, hybrid, or Office 365 environment, connecting and configuring the required telephony components is the most complex and important step in successfully deploying UM, with or without Lync Server Enterprise Voice. You’ll need to connect and configure VoIP gateways, advanced VoIP gateways, PBXs, IP PBXs, and session border controllers (SBCs) for a traditional telephony network and connect to a telephony network if you’ll be using Microsoft Lync Server and UM.
Planning and deploying a new deployment of UM or upgrading a legacy voice mail system can pose challenges for organizations. It requires significant knowledge about VoIP gateways, PBXs, IP PBXs, Microsoft Lync Server, and Unified Messaging. Depending on your technical experience with Exchange and voice mail systems, you might want to obtain the assistance of a Unified Messaging specialist. An Exchange Unified Messaging specialist will help make sure that there’s a smooth transition from a legacy or third-party voice mail system to Exchange Unified Messaging. For more information about how to contact a Unified Messaging specialist, see Microsoft Exchange Server 2013 Unified Messaging (UM) Specialists.
Integrating your telephony network

Unified Messaging requires that you integrate your Exchange Server deployment with your existing telephony network or integrate UM with Microsoft Lync Server for your organization. To successfully deploy and manage UM voice mail you need to make a careful analysis of your existing telephony infrastructure or your Microsoft Lync Server Enterprise Voice deployment and complete the necessary planning steps.
VoIP gateways

When you’re deploying UM in an Exchange organization, you must either install, deploy, and configure a single or multiple VoIP gateways to connect to the PBXs in your telephony network, or install, deploy, and configure Session Initiation Protocol (SIP)-enabled PBXs or IP PBXs.
A VoIP gateway is a third-party hardware device that connects a legacy PBX to your LAN. The VoIP gateway lets the PBX system communicate with the Exchange servers in your organization.
UM relies on the VoIP gateway’s ability to translate or convert Time Division Multiplexing (TDM) or circuit-switched based protocols like ISDN and QSIG from a PBX to IP-based or VoIP-based protocols like SIP, Realtime Transport Protocol (RTP), or T.38 for Realtime Fax Transport. The VoIP gateway is integral to the functionality and operation of UM. The VoIP gateway can also connect to PBX systems that use VoIP instead of public switched telephone network (PSTN) circuit-switched protocols.
Choosing the correct VoIP gateway, IP PBX, SIP-enabled PBX, or SBC is only the first part of integrating your telephony network with UM. You must configure those devices to work with UM. In both on-premises and hybrid deployments, you would need to deploy the required Client Access and Mailbox servers, and create and configure all necessary UM components. For Office 365 with hosted voice mail, you’re not required to install and configure any server. The components allow you to make the connection from your telephony, circuit-switched network to your IP data network and to enable voice mail for the users in your organization. For details and supported telephony devices, see the following resources:

Telephony Advisor for Exchange 2013
Configuration Notes for Supported VoIP Gateways, IP PBXs, and PBXs
Configuration Notes for Supported Session Border Controllers

Microsoft Lync Server

Unified Messaging can use Microsoft Lync Server to combine voice messaging, instant messaging, enhanced presence, audio/video conferencing, and email into a familiar, integrated communications experience. Providing Enterprise Voice features to the users in your organization by integrating UM and Microsoft Lync Server has the following benefits:
Enhanced presence notifications across a variety of applications that keep users informed of the availability of contacts.
Integration of instant messaging, voice messaging, conferencing, email, and other communication modes, which enables users to select the most appropriate mode for the task. Users can also switch from one mode to another as needed.
Availability of communications alternatives from any location where an Internet connection is available.
A smart client (Microsoft Lync) for telephony, instant messaging, and conferencing.
Continuity of the user experience across multiple devices.
The Exchange UM routing component handles voice mail routing between Lync Server and Exchange servers to integrate Lync Server with Unified Messaging features. The Exchange UM routing component found in Lync Server also handles rerouting of voice mail over the PSTN if Exchange servers aren’t available. If you have Enterprise Voice deployed at branch office sites, and those sites don’t have a resilient WAN link to a central site, a Survivable Branch Appliance that you deploy at the branch site provides voice mail for branch users if a WAN link goes down. When the WAN link is unavailable, the Survivable Branch Appliance does the following:
Reroutes unanswered calls over the PSTN to an Exchange server in the central site.
Provides the ability for a user to retrieve voice messages over the PSTN.
Queues missed call notifications, and then uploads them to the Exchange server when the WAN link is restored.
For more information about Microsoft Lync Server, see Microsoft Lync Server.

source: http://technet.microsoft.com

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Paul Balo

Paul Balo

Paul Balo is the founder of TechBooky and a highly skilled wireless communications professional with a strong background in cloud computing, offering extensive experience in designing, implementing, and managing wireless communication systems.

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