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ive Communications Server (LCS) is a Microsoft Office server product that enhances your organization’s communications and productivity by providing real-time information about people’s presence, availability, and preferred mode of communication.

Unless you have been living under a rock for the past few years (and if you have, welcome!), you have probably heard of instant messaging. In fact, chances are you would not have bought this fantastic book if you did not already know what instant messaging actually is.

his chapter will introduce you to the Session Initiation Protocol (SIP) and will also give you an insight into the SIP message structure.

ou can deploy Live Communications Server 2005 SP1 in one of several server roles. These server roles perform specific tasks that enable different scenarios. The configuration of these server roles in relation to each other defines a topology. Chapter 6 describes the set of topologies supported by Live Communications Server 2005 SP1. This chapter focuses on understanding the different server roles that are available and when to use them.

ive Communications Server 2005 SP1 is a client-server architecture product geared for enterprises. Microsoft offers several clients to connect to Live Communications Server: Windows Messenger 5.1, Office Communicator 2005, Communicator Web Access, and Office Communicator Mobile. In this chapter, we’ll discuss each of these clients in detail.

ou can deploy Live Communications Server in a variety of configurations. Since it’s nearly impossible for the development team to cover all the possible configurations, the product team has defined a set of topologies supported by Product Support Services. Since Live Communications Server uses Active Directory, it must be deployed within a forest environment. Multiple Standard Edition Servers and Enterprise pools deployed within a single Active Directory forest can communicate with each other. Standard Edition Servers and Enterprise pools deployed in different Active Directory forests can communicate with each other only over a federation connection. The “Single-Forest Topologies” section covers unique types of topologies supported within a single Active Directory forest.

f your organization is already using Active Directory as the primary directory services, then we don’t need to explain the value of Active Directory. It is worthwhile, however, to understand how Live Communications Server 2005 SP1 extracts value from Active Directory. The integration of Live Communications Server 2005 SP1 and Active Directory makes managing Live Communications Server machines simpler and more convenient. For example, global information that needs to be shared by all Live Communications Servers can be stored in Active Directory instead of replicating it across servers. In addition, server information can be published in Active Directory for easy discoverability. This makes it possible to remotely manage Live Communications Server machines from any computer joined to the Active Directory forest with Live Communications Server’s Admin Tools installed. By using Active Directory, users can sign in to Live Communications Server using their Windows credentials (that is, username and password). This single sign-in avoids requiring users to manage separate credentials. Live Communications Server leverages Active Directory to determine whether a user is authorized to access certain information such as by searching for other users in the organization.

here appropriate, Live Communications Server leverages existing technology such as Active Directory (which we covered in Chapter 7), SQL Server, Microsoft Operations Manager (see Chapter 19), DNS, and PKI. This chapter covers these last two related concepts: SIP DNS namespaces and PKI certificates. It is important to understand these concepts and how they relate before requesting certificates for your Live Communications Servers.

nstalling a Standard Edition Server is simple. In fact, you don’t need a long-winded chapter on this subject. Just fire up the Setup program, and follow the instructions. You must complete two steps. The first step is to install the software on the local computer. This requires only local administrative rights. The second step is to activate the server. You’ll need administrative rights with membership in the RTCDomainServerAdmins group, which is created by Live Communications Server. Of course, being the root domain administrator will suffice as well. You’ll be done before you even finish reading this chapter. Therefore, instead of walking you through the process, this chapter will provide you with insights that might not be apparent to help you in your successful deployment.

nstalling Enterprise pool is substantially more involved than installing a Standard Edition Server. This requires using the Enterprise Edition CD. The hardware requirements for an Enterprise pool are also more demanding, and the completely of the product increases. However, an Enterprise pool provides benefits that are not available in a Standard Edition Server.