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SIP Makes Your Presence Known: Page 8 of 8

The pool also dictates authentication for identifying users, such as NTLM (NT LAN Manager, Kerberos or both. I used NTLM and managed the pool resources as well as all aspects of LCS from a Microsoft Management Console. (See the screen.)

Once the server was up and running, I installed Communicator 2005 on the laptops. Communicator 2005 established and maintained presence for authenticated users via SIP signaling, but using Microsoft's implementation of the SIP standard.

I could view when "sdoherty" and "randerson" were online, offline or too busy for an IM session, telephone call, videoconference or sharing an application. But Communicator's SIP implementation fell short: I couldn't use Communicator to log into a Communigate Pro SIP server or an Asterisk 1.0.9 server, and I could only log into LCS using NTLM or Kerberos authentication and obtain presence information if my endpoints supported Windows APIs.

The advantage of using Microsoft Communicator as the platform for LCS is its integration with other Microsoft apps. For example, when the "sdoherty" Outlook calendar showed he had a meeting, LCS indicated over Communicator that he was unavailable while the meeting was in progress. Once the meeting was over, LCS automatically showed he was back online and available.