Microsoft Office Communicator 2005 utilizes these SIP methods

In this example, Dan Willis is sending an invitation to initiate a messaging session with me. If I want to communicate with Dan, even when it s 2 A.M., I will respond with the following SIP response message: SIP/2.0 200 OK Via: SIP/2.0/UDP To: Joe ;tag=987 From: Dan Willis ;tag=123 Call-ID: 972-555-5555@ CSeq: 1 INVITE Contact: Content-Type: application/sdp Content-Length: 200 As you can see, SIP messages contain the information required for one contact to communicate with another contact, much like our mobile and digital phones use to contact one another for example, when someone calls you on the phone and you see the Caller ID. Caller ID is one of many settings that are negotiated between callers. Introducing Transport Layer Security Transport Layer Security (TLS) is the security protocol that is enabled for use within a Live Communications Server environment to provide encryption and authentication trusts between LCS clients. This book provides an overview of TLS, so I encourage you to read the RFC 2246 for TLS. As the next evolution of SSL, TLS continues to provide an encrypted transport for messaging traffic to be sent and received. Enabling TLS within a Live Communications Server environment, like SSL in a web server environment, requires a Public Key Infrastructure (PKI), which requires certificate configuration and application on both the client and server devices. Live Communications Server requires each server to have a TLS certificate installed, while the root Enterprise Certificate Authority that issued the server certificates must be trusted on the client device, whether it is a laptop, desktop, or mobile device. Figure 1-9 shows an architecture diagram that depicts how TLS and Mutual Transport Layer Security (MTLS), described in the following section, are used for client-to-server and server-to-server communications within a Live Communications Server environment. Live Communications Server does not require TLS for client-to-server communication, as it offers TCP as its default communication protocol and uses Active Directory to authenticate users, but it does require MTLS for server-to-server communication, which means if you are deploying a LCS Enterprise Edition pool or multiple LCS servers, you will need to enable MTLS connectivity between servers. Enabling TLS within your Live Communications Server environment will provide the level of security that is required to encrypt and authenticate messages between your Live Communications Server users and servers. 20 Chapter 1
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