IT tutorials
 
Applications Server
 

Microsoft Lync Server 2010 : Mediation Server Overview

3/11/2014 3:43:43 AM
- How To Install Windows Server 2012 On VirtualBox
- How To Bypass Torrent Connection Blocking By Your ISP
- How To Install Actual Facebook App On Kindle Fire

The Mediation Server in Microsoft Lync Server 2013 is a service that connects your Lync users and Lync Servers to the PSTN. This server role is required for any connections to the PSTN or a legacy PBX infrastructure. When organizations are planning to deploy Enterprise Voice or Dial-In Conferencing, a Mediation Server must be deployed and connected to a next-hop PBX or PSTN. There are various ways to connect to the PSTN, including a PSTN Gateway, an IP-PBX, as Session Border Controller (SBC), or directly to a SIP trunk.

The Mediation Server is a back-to-back user agent (B2BUA). A B2BUA operates between both endpoints in a SIP call to facilitate communications. When routing calls to the PSTN, users are directed to a Mediation Server. The Mediation Server receives a PSTN call request directly from Lync clients and divides the call into two signaling and media sessions. The Mediation Server then initiates a call through the PSTN device it is connected to. During PSTN calls, all SIP signaling routes through the Mediation Server. Additionally, media can also route through the Mediation Server if Media Bypass has been disabled. Figure 1 outlines a sample call flow between a Lync client and the PSTN with the Mediation Server managing all signaling during the call.

Image

Figure 1. Mediation Server signaling example.

All SIP signaling will traverse the Lync Mediation Server, but media can travel directly from Lync users and the PSTN gateway or IP-PBX. Lync Server 2010 introduced the Media Bypass feature, which allows Lync users to send media directly to supported gateways or PBXs using the G.711 media codec. This feature remains in Lync Server 2013 and provides improved call quality, and much larger capacity to the Mediation Server role. Figure 2 provides two examples of how media could flow in Lync Server 2013: with Media Bypass disabled and with it enabled.

Image

Figure 2. Mediation Server media flow example.

Media Bypass becomes more attractive in branch site scenarios. When a branch site is connected to a centralized Lync infrastructure and that branch site has its own PSTN connectivity, Media Bypass can allow Lync users in the branch site to communicate directly with the local media gateway, greatly reducing bandwidth requirements over the WAN.

The Mediation Server can also provide PSTN connectivity to remote users through the Lync Edge Server. When remote users make PSTN calls, they will be connected to a Mediation Server through the Edge Server, and the signaling and media flow will be handled as if the users were on the corporate network with the exception of Media Bypass, which is not enabled in Edge Server scenarios. As a summary, the Mediation Server is responsible for the following functions in Lync Server 2013:

• Encrypting and decrypting media from Lync users to a legacy PBX or the PSTN

• Maintaining SIP signaling sessions over TCP and/or TLS between Lync users and the PBX or PSTN

• Translating and/or transcoding media streams between Lync users and servers and the PBX or PSTN

Mediation Server Collocation

By default, the Mediation Server role is collocated with the Front End Server role. Microsoft supports collocation of the Mediation Server role with the Front End Server role, but no other server roles. Although it is supported, collocation should be carefully planned for based on the following:

• The number of gateway peers the Mediation Server will be connected to

• The amount of traffic through those gateways

• The percentage of calls that are enabled for Media Bypass

The Mediation Server can require heavy processing for media traversal and transcoding in some scenarios. Often, small organizations can collocate the Mediation Server role; however, many larger organizations will require dedicated Mediation Server roles for capacity purposes. Media Bypass also has a major impact on the number of calls a Mediation Server can support.

Table 1. Mediation Server Collocated Capacity Numbers

Image
 
Others
 
- Sharepoint 2013 : Creating and editing discussions (part 2) - Edit a discussion you have created
- Sharepoint 2013 : Creating and editing discussions (part 1) - Create a new discussion
- Sharepoint 2013 : Viewing badges and reputation scores for a member
- Microsoft Exchange Server 2013 : Role-based access control - Working with RBAC (part 3) - Maintaining role group membership
- Microsoft Exchange Server 2013 : Role-based access control - Working with RBAC (part 2) - Creating a new role group
- Microsoft Exchange Server 2013 : Role-based access control - Working with RBAC (part 1)
- Microsoft Exchange Server 2013 : Role-based access control - Scopes
- Microsoft Exchange Server 2013 : Role-based access control - Role groups
- Microsoft Exchange Server 2013 : Role-based access control - Roles
- Microsoft Exchange Server 2013 : Role-based access control - RBAC basics
 
 
Top 10
 
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Finding containers and lists in Visio (part 2) - Wireframes,Legends
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Finding containers and lists in Visio (part 1) - Swimlanes
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Formatting and sizing lists
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Adding shapes to lists
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Sizing containers
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 3) - The Other Properties of a Control
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 2) - The Data Properties of a Control
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 1) - The Format Properties of a Control
- Microsoft Access 2010 : Form Properties and Why Should You Use Them - Working with the Properties Window
- Microsoft Visio 2013 : Using the Organization Chart Wizard with new data
programming4us programming4us
 
Popular tags
 
Video Tutorail Microsoft Access Microsoft Excel Microsoft OneNote Microsoft PowerPoint Microsoft Project Microsoft Visio Microsoft Word Active Directory Biztalk Exchange Server Microsoft LynC Server Microsoft Dynamic Sharepoint Sql Server Windows Server 2008 Windows Server 2012 Windows 7 Windows 8 Adobe Indesign Adobe Flash Professional Dreamweaver Adobe Illustrator Adobe After Effects Adobe Photoshop Adobe Fireworks Adobe Flash Catalyst Corel Painter X CorelDRAW X5 CorelDraw 10 QuarkXPress 8 windows Phone 7 windows Phone 8 BlackBerry Android Ipad Iphone iOS