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Monthly Archives: February 2011

Communicator 2010 – What’s New?

Step by Step: Lync Server 2010 Deployment

This article aims at providing step by step approach to install a Lync Server 2010 Standard Edition.

Let’s first ensure that the environment is ready to welcome the Lync Server.

Operating System support for Lync Server 2010

All server roles of Lync Server 2010 require one of the following operating systems:

  • The 64-bit edition of Windows Server 2008 R2 (Standard, Enterprise or Datacenter).
  • The 64-bit edition of Windows Server 2008 SP2 (Standard, Enterprise, or Datacenter).

Components required on Lync Server machine

Commands to install all pre-requisites… (On Windows Server 2008 R2)

PS C:\> Import-Module ServerManager

PS C:\> Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Static-Content,Web-Default-Doc,Web-Http-Errors,Web-Http-Redirect,Web-Asp-Net,Web-Net-Ext,Web-ISAPI-Ext,Web-ISAPI-Filter,Web-Http-Logging,Web-Log-Libraries,Web-Http-Tracing,Web-Windows-Auth,Web-Client-Auth,Web-Filtering,Web-Stat-Compression,Web-Mgmt-Console,Web-Scripting-Tools –Restart

Above command will install all the features required and reboot the machine.

Now go to the setup folder of Lync Server 2010, and double click setup.exe.

It’ll check the availability of Microsoft Visual C++ 2008 redistributable on the system. If its not installed, it’ll give you option to install the application. Click “Yes” to install it.

Next step would be to choose the installation location.

By default, it’ll select above location. After selecting the right installation location, click on “Install“.

Accept the license agreement and click “ok“.

Topology Builder (TB):

It is must to install Topology Builder (TB) before you can deploy a Lync Server. Topology Builder helps you to define sites and servers in the setup.

Define a topology (xml file gets created).

Topology Builder validates the topology.

Publish the topology after successful validation.

Publishing it puts it into the Communications Server central management store (which is created if it does not already exist).

Click “Install Topology Builder” to install the TB. After installation of TB, it’ll look like following in the deployment wizard.

Preparing Active Directory

To prepare Active Directory Domain Services (AD DS) for your Microsoft Lync Server 2010 deployment, you must perform three steps in a specific sequence:

  • Prep Schema
  • Forest Prep
  • Domain Prep

Permission required for these three operations.

On deploy wizard main screen, click “Prepare Active Directory” and “Run” the schema prep.

On the Schema Prep wizard, click “Next” and “Finish“. This will extend the Active Directory schema for the use of Microsoft Lync Server 2010.

You need to be an enterprise admin to perform this operation.

In this case location of schema prep log was:


Figure out the location of schema prep log in your setup.. 🙂

If you already have an OCS setup then verify the process has completed successfully by checking the rangeUpper (1100) and rangeLower (14) values of the ms-RTC-SIP-SchemaVersion Schema object with adsiedit.msc.

It’s time for forest prep after you are done with schema prep.

From Active Directory Preparation wizard, “Run” the prepare forest operation (Above picture). Click “Finish” when the forest prep is done (below picture).

Log Location: C:\Users\administrator.LYNCDOM\AppData\Local\Temp\2\Enable-CSAdForest-d96954e1-1d86-40c1-942f-54f5ec5052ab.xml

To check the status of forest prep, run the following command in powershell.

PS C:\> Get-CsAdForest

After forest prep is successful, run domain prep for all the concerned domains in Active Directory.

Log Location for domain prep action: C:\Users\administrator.LYNCDOM\AppData\Local\Temp\2\Enable-CSAdDomain-[2010_10_06][14_41_28].html

To check the status of Domain Prep, run the following command.

PS C:\> Get-CsAdDomain

Prepare the Microsoft Lync Server

Process to prepare the Lync Server does three things primarily.

1) Checks following components for availability. If anyone them missing, it also installs that component.

2) Creates firewall exception for SQL instance.

3) Creates firewall exception for SQL browser.

After this wizard completes, you should see following components installed on the server.

Before moving further the domain Administrator account used throughout this process should be added as a member to the domain security groups CsAdministrator and RTCUniversalServerAdmins.

This user account should then logoff and back logon to the Windows Server where Lync is being installed to update the associated security token.

Create a share for Lync Server:

It will be used during Lync Server 2010 installation. Everyone should have “Read & Execute” permission.

Administrators should have “Full Control”.

Share name for this purpose in this article is “LyncFolder”.

Defining topology with the help of Topology Builder

Open the TB from start menu.

Provide a name to the topology. For example, “NewYork.tbxml”.

Back at the main Topology Builder window select Edit Properties on the Lync Server 2010 (RC) root-level object.  Highlight the Simple URLs section and enter the desired Administrative Access URL.

Note: the additional for Phone Access URLs and Meeting URLs are already configured.

Also highlight the Central Management Server section and select the new Front-End server from the drop-down menu if it is not already selected.

By now local SQL instance will have two databases LIS and XDS. Also, the shared folder is configured properly.

DNS Records:

Create following three hostnames

All three hostnames should point to the IP Address of the standard edition server (enterprise edition pool IP if its enterprise edition deployment).

Installation of Microsoft Lync Server 2010 binaries

Run “setup or remove Lync Server components”.

After rebooting the server, run “setup or remove Lync Server components” again. This will install the rest of the components on the machine.

Certificate for Lync Server

You can either user certificates from the internal Certification Authority (CA), or you can get the certificates from the public CA. Since this certificate will be used only for the internal purpose, it makes sense to get the certificate from internal CA.

Provide “Organization Information” detail and click “Next”.

Provide “Geographical Information” and click “Next”.

You may get this error during certificate request/assign.

Error: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider. (Exception from HRESULT: 0x800B0109)

Install the Root CA cert chain on the server and run the wizard again to resolve the problem.

After you have successfully configured certificates on the Lync Server, now it’s time to start the services.

Click next on “Start Services” wizard.

Reboot the server.

And, that’s all as far as installation of Lync Server 2010 is concerned.

Then last but not the least… don’t forget to create the corresponding SRV record to enable auto configuration at the clients end.

Install Lync Server 2010

Microsoft Lync 2010 – What’s Lync?

Lync Server 2010 Media Traffic Network Usage

When planning for media bandwidth usage per scenario, use the following tables, which describe the average amount of bandwidth used per media type.

Audio/Video Capacity Planning, Peer-to-Peer Sessions

Audio/Video Capacity Planning, Conferences

Audio Capacity Planning, PSTN

The network bandwidth numbers in these tables represent one-way traffic only and take silence suppression into account.

When you calculate the actual bandwidth usage for a certain scenario, it is important to understand the actual media flows, which are as follows:

In a two-party scenario:

  • Users send audio streams only while they speak.
  • Both participants receive audio streams.
  • If video is used, both users send and receive video streams during the entire call.

In a Conferencing scenario (that is, a call with more than two participants):

  • Users send audio streams only while they speak.
  • All participants receive audio streams.
  • If video is used, only two participants upload a video stream at a time (that is, the active speaker and the previous active speaker).
  • If video is used, all participants receive video streams.

Lync 2010 Voice Deployment User Experience Comparison

There are three primary deployment scenarios for Microsoft® Lync™ Server 2010 customers. The three options, which differ in the user capabilities provided and the required infrastructure, are:

· Replace PBX phones with Lync to improve communications and collaboration, and to reduce infrastructure costs. This is the preferred Lync deployment scenario as it allows customers to simplify their communications infrastructure and rely exclusively on Lync Server 2010 for voice, conferencing, instant messaging and presence.

· Enhance PBX phones with the option to use Lync to improve communications and collaboration. This scenario is useful for organizations that are not yet ready to remove their existing PBX systems, but who want to provide their users either with the option to use Lync for phone calls instead of their PBX phone, or with the option to control their PBX phone with the Lync desktop client. The former approach is useful for providing seamless communications for employees working at home and on the road, and as a transitional approach while PBX systems are amortized and decommissioned. The latter approach is useful for providing desktop “Click-to-call” capability with existing PBX phones.

· Add instant messaging, presence, and conferencing to existing phone capabilities. This scenario is useful for customers that want to add Lync capabilities other than enterprise voice.


1. Entries marked “*” in the “Enhance, using Lync as phone” column apply when the user uses the Lync soft-phone only, not the PBX phone. Using the soft-phone in this scenario is the Lync default.

2. Entries marked “+” in the “Enhance, using Lync to control PBX phone” column apply when the user uses the Lync soft-phone only, not the PBX phone. Using the soft-phone in this scenario requires that the user manually select “Lync call” in a drop-down menu each time a call is initiated.

As shown in the table above, with the Replace option, Lync is the only communications system used and provides the full set of unified communications capabilities to users inside and outside the office. With the Enhance option, users have both Lync and a PBX phone, and choose which phone to use at any given time. When Lync is chosen as the primary phone, as in the “Enhance, using Lync as phone” variant, users have the full set of unified communications capabilities inside and outside the office; when the PBX phone is chosen as the primary phone, as in the “Enhance using Lync to control the PBX phone” variant, users have a rich but reduced set of unified communications capabilities.


The Replace, Enhance, and Add options enable organizations to standardize on Lync as the only desktop software client for real time communications, but require different supporting infrastructure. In particular:

· The Replace option allows customers to eliminate separate PBX and conferencing systems and the associated user databases and management tools in favor of Lync Server, Active Directory, PowerShell, and Systems Center Operations Manager. This enables significant capital and operational cost savings, and takes advantage of existing skills in these areas.

· The Enhance and Add options require ongoing maintenance of existing PBX systems until those systems are retired. They also require the interconnection of the existing PBX systems with Lync Server, using Direct SIP or a third party gateway qualified via the Unified Communications Open Interoperability Program. This interconnection enables calls to be carried between Lync Server and the PBX systems.

The Enhance, using Lync to control the PBX phone additionally requires the deployment and maintenance of a connection to the PBX. This connection may require a PBX software upgrade and per user PBX software license fees, depending on the PBX manufacturer, and requires associated configuration and management.

The table below summarizes the key infrastructure differences for the deployment options.

As shown in the table above, the Replace option requires the minimum amount of infrastructure. This enables significant cost savings for organizations: for example, Sprint projects annual savings of over $9 million based on its replacement of nearly 500 PBX systems with Microsoft unified communications technology.