{{no footnotes, date=June 2018 Live Communications Server 2005 (LCS 2005), codenamed Vienna, is the second version of a SIP based

instant messaging Instant messaging (IM) technology is a type of online chat allowing real-time text transmission over the Internet or another computer network. Messages are typically transmitted between two or more parties, when each user inputs text and trigge ...

and presence server after Live Communications Server 2003. LCS 2005 was first released in 2005, and was updated with new features with

Service Pack In computing, a service pack comprises a collection of updates, fixes, or enhancements to a software program delivered in the form of a single installable package. Companies often release a service pack when the number of individual patches to a ...

1 in 2006. LCS 2005 has been superseded by

Microsoft Office Communications Server 2007 Skype for Business Server (formerly Microsoft Office Communications Server and Microsoft Lync Server) is real-time communications server software that provides the infrastructure for enterprise instant messaging, presence, VoIP, ad hoc and str ...

Overview

This product allows SIP clients to exchange IMs and presence using the

SIMPLE Simple or SIMPLE may refer to: *Simplicity, the state or quality of being simple Arts and entertainment * ''Simple'' (album), by Andy Yorke, 2008, and its title track * "Simple" (Florida Georgia Line song), 2018 * "Simple", a song by Johnn ...

protocol. The client also allows two clients to set up audio/video sessions, application sharing, and file transfer sessions. The product was released in two editions, Standard Edition and Enterprise Edition. The Standard Edition uses a Microsoft SQL Server Desktop Engine (

MSDE Microsoft SQL Server Data Engine (MSDE, also Microsoft Data Engine or Microsoft Desktop Engine) is a relational database management system developed by Microsoft. It is a scaled-down version of Microsoft SQL Server 7.0 or 2000 which is free for n ...

) (included with the product) to store configuration and user data. Enterprise Edition uses a full version of

Microsoft SQL Server Microsoft SQL Server is a relational database management system developed by Microsoft. As a database server, it is a software product with the primary function of storing and retrieving data as requested by other software applications—which ma ...

(purchased separately). New features to this version compared to the 2003 release is the ability to leverage SQL and remote user access. Presence is conveyed as levels of availability to communicate. Levels of presence support by LCS: *Online *Busy *Do not disturb *Be right back *Away *In a Meeting These presence levels are controlled manually and automatically. Automatic presence changes can be triggered by the following events: *Locking the workstation -> Away *Screen save launches -> Away *User does not touch keyboard or mouse for a configured time -> Away *User is in full screen mode -> Do not disturb *A user is busy, according to the user's calendar on the Microsoft Exchange Server -> In a meeting

Dependencies

*Microsoft

Active Directory Active Directory (AD) is a directory service developed by Microsoft for Windows domain networks. It is included in most Windows Server operating systems as a set of processes and services. Initially, Active Directory was used only for centralize ...

**Storage of server configuration data **Authentication *** Kerberos ***

NTLM In a Windows network, NT (New Technology) LAN Manager (NTLM) is a suite of Microsoft security protocols intended to provide authentication, integrity, and confidentiality to users. NTLM is the successor to the authentication protocol in Microsoft L ...

PKI PKI may refer to: * Partai Komunis Indonesia, the Communist Party of Indonesia * Peter Kiewit Institute The Peter Kiewit Institute is a facility in Omaha, Nebraska, United States which houses academic programs from the University of Nebraska� ...

** MTLS - used for server to server connections ** TLS - optionally used for client to server connections *

**Storage of server configuration data **User contact list **User watcher list

Client Software

* Microsoft Office Communicator 2005 *

Windows Messenger Windows Messenger is a discontinued instant messaging client included in Windows XP. Designed for use by both corporate and home users, it was originally created, in 2001, as a streamlined and integrated version of MSN Messenger. It was upgrade ...

Server Roles

Both editions of the server software can be installed into several distinct roles: *Home Server *Director *Access Proxy *Branch Office Proxy *Application Proxy

Home Server

In Standard Edition, this server role is designed to host data for the users. The user's data is stored in an SQL database on the backend server (on Enterprise Edition) or on the Home Server (on Standard Edition). The server stores each user's list of contacts and watchers. The contact list is the list of users the end user has added to client software in order to facilitate the sending of IM's and for the monitoring the presence. The watcher list is the list of other users that have added this user to their contact list.

Director

This optional server role is designed to be a kind of traffic cop when you have more than one Home Server role deployed or when you are setting up for remote users to connect to the Home Server. This server does not host any of the user's data, but knows which server each user is homed on, and can therefore redirect or proxy the request.

Access Proxy

This server role is required to allow remote SIP clients to connect from the internet. This server role would be traditionally deployed in a

DMZ A demilitarized zone (DMZ or DZ) is an area in which treaties or agreements between nations, military powers or contending groups forbid military installations, activities, or personnel. A DZ often lies along an established frontier or bounda ...

network. The server's job would be to scan the SIP traffic and only allow communication that the server had been configured to allow to traverse to the internal network. The traffic would be sent either directly to the internal Home Server or to a Director that would send the traffic to the appropriate home server, based on the user the message was destined to.

Branch Office Proxy

This role is used to aggregate connections, from a branch office clients, across a single Transport Layer Security ( TLS) encrypted link, allowing many remote clients to share a single communication channel.

Application Proxy

This server role is designed to allow 3rd party developers to leverage the Live Communications Server SIP stack with a custom code running on top of it. This allows 3rd parties to make a gateway server that could be used to communicate with a PBX or other internal telephony infrastructure without having to create a fully functioning SIP stack.

Public IM Connectivity (PIC)

This is a feature that allows organizations to IM and share presence information between their existing base of Live Communications Server-enabled users and contacts using public IM services provided by MSN, AOL and Yahoo!. This was feature was introduced with LCS 2005 Service Pack 1 in April 2005.

External links

Live Communications Server 2005 - TechnetLive Communications Server 2005 - Technical ReferenceLive Communications Server 2005 - SDK
Instant messaging server software